test(tabletop): cover store actions, interactions, and path sampling

Add tests for the tabletop and interaction stores (seed, surface toggles,
setPart, movePart reindexing/clamping), the interaction store's hold/drop
and dialog stack, and the SVG path sampler (Q/T/S/A commands, unsupported
commands, pointAt edge cases, and zero-length curves). stacking.ts goes
from 61% to 99.5% line coverage.

.agents/skills/commit-conventions/SKILL.md

@@ -0,0 +1,55 @@
+---
+name: commit-conventions
+description: How to write git commits for this repository. Use when committing changes, writing commit messages, or splitting work into commits. Covers conventional commit format and separating commits by concern.
+---
+
+# Commit Conventions
+
+Follow these rules whenever you create a commit in this repository.
+
+## Conventional Commits
+
+Write every commit message using the [Conventional Commits](https://www.conventionalcommits.org/) format:
+
+```
+<type>(<scope>): <subject>
+```
+
+- **type**: `feat`, `fix`, `chore`, `docs`, `refactor`, `perf`, `test`, `build`, `ci`, `style`.
+- **scope** (optional): the area of the codebase the change touches. Use the workspace package or directory name when it's clear (e.g. `proxy`, `web`, `packages`). Omit when the change spans multiple areas.
+- **subject**: imperative mood, capitalized, no trailing period, ≤ 50 characters.
+
+Examples:
+
+```
+feat(proxy): add TTS streaming endpoint
+fix(web): handle empty transcript in player
+docs: document workspace layout
+```
+
+## Separate Commits by Concern
+
+Do not bundle unrelated changes into a single commit. Split work so each commit is a focused, self-contained unit:
+
+- One logical change per commit (a feature, a fix, a refactor, a doc update).
+- Keep each commit buildable and independently reviewable.
+- Separate concerns that have different types, scopes, or reasons to be reverted independently.
+- If a change is large, split it into a series of smaller commits that each stand on their own.
+
+## Message Body
+
+Include a body only when it adds useful context beyond the subject. If the subject fully captures the change, omit it.
+
+- Separate the subject from the body with a blank line.
+- Wrap the body at 72 characters.
+- Explain the *why* and *what* rather than restating the code.
+- Do not repeat information already in the subject line.
+- Use `BREAKING CHANGE:` in the body (or `!` after the type/scope) for breaking changes.
+
+## When to Use This Skill
+
+Activate this skill when:
+
+- Creating a new commit.
+- Writing or revising a commit message.
+- Deciding how to split staged or unstaged changes into commits.

.gitattributes

@@ -0,0 +1,7 @@
+# Game assets are large binaries; store them in Git LFS.
+games/**/*.png filter=lfs diff=lfs merge=lfs -text
+games/**/*.jpg filter=lfs diff=lfs merge=lfs -text
+games/**/*.jpeg filter=lfs diff=lfs merge=lfs -text
+games/**/*.webp filter=lfs diff=lfs merge=lfs -text
+games/**/*.glb filter=lfs diff=lfs merge=lfs -text
+games/**/*.gltf filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -1,8 +1,9 @@
 node_modules/
 dist/
+coverage/
 *.log
 .env
 .env.local
 
 # Generated TTS save dumps (scripts/dump-save.mjs)
-scripts/dumps/
+scripts/dumps/

README.md

@@ -14,8 +14,9 @@ analyze their contents. A lightweight, client-only pnpm monorepo.
 | `packages/mesh`     | 2D shapes + extrusion into 3D mesh geometry            | Isomorphic |
 | `packages/shared`   | Shared types + zod schemas                             | Isomorphic |
 
-See [`docs/architecture.md`](docs/architecture.md) for the architecture and
-[`docs/implementation-plan.md`](docs/implementation-plan.md) for the plan.
+See [`docs/overview.md`](docs/overview.md) for the docs index,
+[`docs/architecture.md`](docs/architecture.md) for the architecture, and
+[`docs/status/implementation-plan.md`](docs/status/implementation-plan.md) for the plan.
 
 ## Setup
 
@@ -38,7 +39,7 @@ To run the frontend alongside the proxy, open a second terminal and run
 | GET    | `/health`         | Liveness                                     |
 | GET    | `/search?q=&page=`| Search the Workshop (scrapes browse page)    |
 | GET    | `/items/:id`      | Full parsed `TTSMod` (BSON save)             |
-| GET    | `/items/:id/file` | Raw save bytes, filename from header         |
+| GET    | `/items/:id/file` | Raw save bytes, filename from the URL path   |
 | GET    | `/asset?url=`      | CORS-safe proxy for external assets (textures, models) |
 | GET    | `/trace?url=&mode=&format=&offset=` | Trace an image into a vector shape (BSON); `offset` insets/outsets in pixels |
 

apps/proxy/src/config.ts

@@ -0,0 +1,12 @@
+/**
+ * Runtime config for the proxy. `GAMES_ROOT` is set at startup (from env or a
+ * default) and read by the asset/trace routes to serve local game assets. It's
+ * a module-level value because the node-server adapter injects its own
+ * `HttpBindings` as the Hono env, not custom bindings.
+ */
+export let GAMES_ROOT: string | undefined;
+
+/** Set the games root at startup. */
+export function setGamesRoot(root: string | undefined): void {
+  GAMES_ROOT = root;
+}

apps/proxy/src/env.test.ts

@@ -3,9 +3,10 @@ import { loadEnv } from './env.js';
 
 describe('loadEnv', () => {
   it('parses a valid environment', () => {
-    expect(loadEnv({ STEAM_API_KEY: 'key', PORT: '4000' })).toEqual({
+    expect(loadEnv({ STEAM_API_KEY: 'key', PORT: '4000', GAMES_ROOT: '/games' })).toEqual({
       STEAM_API_KEY: 'key',
       PORT: 4000,
+      GAMES_ROOT: '/games',
     });
   });
 

apps/proxy/src/env.ts

@@ -3,6 +3,8 @@ import { z } from 'zod';
 const envSchema = z.object({
   STEAM_API_KEY: z.string().min(1).optional(),
   PORT: z.coerce.number().int().min(1).max(65535).default(3000),
+  /** Absolute path to the games root, for serving local game assets. */
+  GAMES_ROOT: z.string().min(1).optional(),
 });
 
 export type Env = z.infer<typeof envSchema>;
@@ -11,6 +13,7 @@ export type Env = z.infer<typeof envSchema>;
 export interface Bindings {
   STEAM_API_KEY?: string;
   PORT: number;
+  GAMES_ROOT?: string;
 }
 
 export function loadEnv(source: NodeJS.ProcessEnv = process.env): Env {

apps/proxy/src/index.ts

@@ -1,15 +1,26 @@
 import { serve } from '@hono/node-server';
 import { cors } from 'hono/cors';
 import { Hono } from 'hono';
+import { fileURLToPath } from 'node:url';
+import * as path from 'node:path';
 import { loadEnv, type Bindings } from './env.js';
+import { setGamesRoot } from './config.js';
 import asset from './routes/asset.js';
 import health from './routes/health.js';
 import items from './routes/items.js';
+import pdf from './routes/pdf.js';
 import search from './routes/search.js';
 import trace from './routes/trace.js';
 
 const env = loadEnv();
 
+// Default GAMES_ROOT to the repo's `games` folder so local game assets work
+// without configuration; override via env.
+setGamesRoot(
+  env.GAMES_ROOT ??
+    path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', '..', '..', 'games'),
+);
+
 const app = new Hono<{ Bindings: Bindings }>();
 
 app.use('*', cors());
@@ -17,6 +28,7 @@ app.route('/health', health);
 app.route('/search', search);
 app.route('/items', items);
 app.route('/asset', asset);
+app.route('/pdf', pdf);
 app.route('/trace', trace);
 
 serve(

apps/proxy/src/routes/asset.test.ts

@@ -1,8 +1,20 @@
-import { afterEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as path from 'node:path';
+import { mkdtempSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
 import asset from './asset.js';
+import { setGamesRoot } from '../config.js';
+
+let dir: string;
+
+beforeEach(() => {
+  dir = mkdtempSync(path.join(tmpdir(), 'games-'));
+  setGamesRoot(dir);
+});
 
 afterEach(() => {
   vi.unstubAllGlobals();
+  setGamesRoot(undefined);
 });
 
 describe('asset route', () => {
@@ -40,4 +52,22 @@ describe('asset route', () => {
     const res = await asset.request('/?url=https%3A%2F%2Fexample.com%2Fa.png');
     expect(res.status).toBe(502);
   });
+
+  it('serves a local game asset from GAMES_ROOT', async () => {
+    writeFileSync(path.join(dir, 'cards.png'), new Uint8Array([1, 2, 3]));
+    const res = await asset.request('/?url=cards.png');
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('image/png');
+    expect(await res.arrayBuffer()).toEqual(new Uint8Array([1, 2, 3]).buffer);
+  });
+
+  it('returns 404 for a missing local asset', async () => {
+    const res = await asset.request('/?url=nope.png');
+    expect(res.status).toBe(404);
+  });
+
+  it('rejects path traversal outside GAMES_ROOT', async () => {
+    const res = await asset.request('/?url=..%2F..%2Fetc%2Fpasswd');
+    expect(res.status).toBe(400);
+  });
 });

apps/proxy/src/routes/asset.ts

@@ -1,4 +1,6 @@
 import { Hono } from 'hono';
+import { GAMES_ROOT } from '../config.js';
+import { resolveAsset } from './resolveAsset.js';
 
 const app = new Hono();
 
@@ -7,6 +9,10 @@ const app = new Hono();
  * client. Workshop asset hosts (steamusercontent.com, etc.) often omit CORS
  * headers, which would block `TextureLoader` / `GLTFLoader` in the browser.
  * Routing through the proxy makes those assets loadable.
+ *
+ * A relative URL (no scheme) is treated as a game asset path relative to the
+ * `GAMES_ROOT` directory and served from disk, so bgm parts can reference
+ * local files (e.g. `poker/parts/assets/cards.png`).
  */
 app.get('/', async (c) => {
   const raw = c.req.query('url');
@@ -14,20 +20,28 @@ app.get('/', async (c) => {
     return c.json({ error: 'Missing url query param' }, 400);
   }
 
-  let url: URL;
-  try {
-    url = new URL(raw);
-  } catch {
-    return c.json({ error: 'Invalid url query param' }, 400);
+  const result = await resolveAsset(raw, GAMES_ROOT);
+  if (!result.ok) {
+    // A missing local file vs an invalid reference.
+    return c.json(
+      { error: result.reason === 'not-found' ? 'Asset not found' : 'Invalid url query param' },
+      result.reason === 'not-found' ? 404 : 400,
+    );
   }
-  // Only allow http(s) to avoid SSRF via file://, etc.
-  if (url.protocol !== 'http:' && url.protocol !== 'https:') {
-    return c.json({ error: 'Only http(s) urls are allowed' }, 400);
+  const asset = result.asset;
+
+  if (asset.stream) {
+    return new Response(asset.stream as unknown as BodyInit, {
+      headers: {
+        'Content-Type': asset.contentType,
+        'Cache-Control': 'public, max-age=86400',
+      },
+    });
   }
 
   let res: Response;
   try {
-    res = await fetch(url);
+    res = await fetch(asset.url!);
   } catch (err) {
     return c.json({ error: `Failed to fetch asset: ${String(err)}` }, 502);
   }

apps/proxy/src/routes/items.test.ts

@@ -1,10 +1,18 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { ItemNotFoundError, SteamApiError, TtsError } from '@tts/tts';
-import type { TTSMod } from '@tts/shared';
+import type { ModDetails } from '@tts/shared';
 import items from './items.js';
 
 const env = { STEAM_API_KEY: 'test-key', PORT: 3000 };
 
+const mod = {
+  GameMode: 'Tabletop',
+  Date: '2024-01-01',
+  ObjectStates: [],
+};
+
+const details: ModDetails = { mod };
+
 afterEach(() => {
   vi.unstubAllGlobals();
 });
@@ -17,7 +25,7 @@ describe('items route', () => {
   });
 
   it('returns 500 when the API key is missing and no fileUrl is given', async () => {
-    vi.spyOn(await import('@tts/tts'), 'fetchMod').mockRejectedValue(
+    vi.spyOn(await import('@tts/tts'), 'fetchModDetails').mockRejectedValue(
       new TtsError('STEAM_API_KEY is not configured', 500),
     );
     const res = await items.request('/123', {}, { STEAM_API_KEY: '', PORT: 3000 });
@@ -26,11 +34,6 @@ describe('items route', () => {
   });
 
   it('loads from a fileUrl without an API key', async () => {
-    const mod: TTSMod = {
-      GameMode: 'Tabletop',
-      Date: '2024-01-01',
-      ObjectStates: [],
-    };
     const fetchModFromUrl = vi
       .spyOn(await import('@tts/tts'), 'fetchModFromUrl')
       .mockResolvedValue(mod);
@@ -40,26 +43,26 @@ describe('items route', () => {
       { STEAM_API_KEY: '', PORT: 3000 },
     );
     expect(res.status).toBe(200);
-    expect(await res.json()).toEqual(mod);
+    expect(await res.json()).toEqual(details);
     expect(fetchModFromUrl).toHaveBeenCalledWith('https://example.com/save.json');
   });
 
-  it('returns the parsed mod on success', async () => {
-    const mod: TTSMod = {
-      GameMode: 'Tabletop',
-      Date: '2024-01-01',
-      ObjectStates: [],
+  it('returns the parsed mod with metadata on success', async () => {
+    const withMeta: ModDetails = {
+      mod,
+      title: 'My Mod',
+      previewImageUrl: 'https://example.com/preview.png',
     };
     vi.stubGlobal('fetch', vi.fn().mockResolvedValue(new Response('{}')));
-    vi.spyOn(await import('@tts/tts'), 'fetchMod').mockResolvedValue(mod);
+    vi.spyOn(await import('@tts/tts'), 'fetchModDetails').mockResolvedValue(withMeta);
 
     const res = await items.request('/123', {}, env);
     expect(res.status).toBe(200);
-    expect(await res.json()).toEqual(mod);
+    expect(await res.json()).toEqual(withMeta);
   });
 
   it('maps TtsError subclasses to their status', async () => {
-    vi.spyOn(await import('@tts/tts'), 'fetchMod').mockRejectedValue(
+    vi.spyOn(await import('@tts/tts'), 'fetchModDetails').mockRejectedValue(
       new ItemNotFoundError('123'),
     );
     const res = await items.request('/123', {}, env);
@@ -70,7 +73,7 @@ describe('items route', () => {
   });
 
   it('returns 500 for unexpected errors', async () => {
-    vi.spyOn(await import('@tts/tts'), 'fetchMod').mockRejectedValue(
+    vi.spyOn(await import('@tts/tts'), 'fetchModDetails').mockRejectedValue(
       new Error('boom'),
     );
     const res = await items.request('/123', {}, env);

apps/proxy/src/routes/items.ts

@@ -1,7 +1,7 @@
 import { Hono } from 'hono';
-import { itemIdSchema, type TTSMod } from '@tts/shared';
+import { itemIdSchema, type ModDetails } from '@tts/shared';
 import {
-  fetchMod,
+  fetchModDetails,
   fetchModFile,
   fetchModFileFromUrl,
   fetchModFromUrl,
@@ -20,11 +20,12 @@ app.get('/:id', async (c) => {
   try {
     const fileUrl = c.req.query('fileUrl');
     // With no Steam API key, the caller must supply the save URL (e.g. from a
-    // search result). Otherwise resolve it via the Steam API.
-    const mod: TTSMod = fileUrl
-      ? await fetchModFromUrl(fileUrl)
-      : await fetchMod(id, c.env.STEAM_API_KEY ?? '');
-    return c.json<TTSMod>(mod);
+    // search result). Otherwise resolve it via the Steam API, which also
+    // yields the Workshop title and preview image.
+    const details: ModDetails = fileUrl
+      ? { mod: await fetchModFromUrl(fileUrl) }
+      : await fetchModDetails(id, c.env.STEAM_API_KEY ?? '');
+    return c.json<ModDetails>(details);
   } catch (err) {
     if (err instanceof TtsError) {
       return c.json({ error: err.message }, err.status as 400 | 404 | 500 | 502);

apps/proxy/src/routes/pdf.test.ts

@@ -0,0 +1,65 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as path from 'node:path';
+import { mkdtempSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import pdf from './pdf.js';
+import { setGamesRoot } from '../config.js';
+
+let dir: string;
+
+beforeEach(() => {
+  dir = mkdtempSync(path.join(tmpdir(), 'games-'));
+  setGamesRoot(dir);
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  setGamesRoot(undefined);
+});
+
+describe('pdf route', () => {
+  it('rejects a missing url', async () => {
+    const res = await pdf.request('/');
+    expect(res.status).toBe(400);
+    expect(await res.json()).toEqual({ error: 'Missing url query param' });
+  });
+
+  it('rejects a non-http url', async () => {
+    const res = await pdf.request('/?url=file%3A%2F%2F%2Fetc%2Fpasswd');
+    expect(res.status).toBe(400);
+  });
+
+  it('streams the fetched pdf inline with a pdf content-type', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn().mockResolvedValue(
+        new Response(new Uint8Array([1, 2, 3]), {
+          headers: { 'content-type': 'application/pdf' },
+        }),
+      ),
+    );
+    const res = await pdf.request('/?url=https%3A%2F%2Fexample.com%2Fa.pdf');
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('application/pdf');
+    expect(res.headers.get('content-disposition')).toBe('inline');
+    expect(await res.arrayBuffer()).toEqual(new Uint8Array([1, 2, 3]).buffer);
+  });
+
+  it('returns 502 when the upstream fetch fails', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn().mockResolvedValue(new Response('error', { status: 500 })),
+    );
+    const res = await pdf.request('/?url=https%3A%2F%2Fexample.com%2Fa.pdf');
+    expect(res.status).toBe(502);
+  });
+
+  it('serves a local game asset from GAMES_ROOT', async () => {
+    writeFileSync(path.join(dir, 'rules.pdf'), new Uint8Array([1, 2, 3]));
+    const res = await pdf.request('/?url=rules.pdf');
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('application/pdf');
+    expect(res.headers.get('content-disposition')).toBe('inline');
+    expect(await res.arrayBuffer()).toEqual(new Uint8Array([1, 2, 3]).buffer);
+  });
+});

apps/proxy/src/routes/pdf.ts

@@ -0,0 +1,56 @@
+import { Hono } from 'hono';
+import { GAMES_ROOT } from '../config.js';
+import { resolveAsset } from './resolveAsset.js';
+
+const app = new Hono();
+
+/**
+ * Fetch a PDF and stream it back inline so the browser renders it instead of
+ * downloading. PDF hosts often send `Content-Disposition: attachment`, which
+ * forces a download even when the URL is opened in a tab or iframe. This route
+ * strips that header and forces `inline` so the PDF can be embedded in the web
+ * app's viewer. Like `/asset`, a relative URL (no scheme) is treated as a game
+ * asset path relative to `GAMES_ROOT`.
+ */
+app.get('/', async (c) => {
+  const raw = c.req.query('url');
+  if (!raw) {
+    return c.json({ error: 'Missing url query param' }, 400);
+  }
+
+  const result = await resolveAsset(raw, GAMES_ROOT);
+  if (!result.ok) {
+    return c.json(
+      { error: result.reason === 'not-found' ? 'Asset not found' : 'Invalid url query param' },
+      result.reason === 'not-found' ? 404 : 400,
+    );
+  }
+  const asset = result.asset;
+
+  // A local game asset is streamed from disk; a remote one is fetched.
+  let body: BodyInit;
+  if (asset.stream) {
+    body = asset.stream as unknown as BodyInit;
+  } else {
+    let res: Response;
+    try {
+      res = await fetch(asset.url!);
+    } catch (err) {
+      return c.json({ error: `Failed to fetch pdf: ${String(err)}` }, 502);
+    }
+    if (!res.ok) {
+      return c.json({ error: `Pdf responded ${res.status}` }, 502);
+    }
+    body = res.body!;
+  }
+
+  return new Response(body, {
+    headers: {
+      'Content-Type': 'application/pdf',
+      'Content-Disposition': 'inline',
+      'Cache-Control': 'public, max-age=86400',
+    },
+  });
+});
+
+export default app;

apps/proxy/src/routes/resolveAsset.ts

@@ -0,0 +1,76 @@
+import { createReadStream } from 'node:fs';
+import { stat } from 'node:fs/promises';
+import * as path from 'node:path';
+
+/** Content-type by extension for local game assets. */
+const CONTENT_TYPES: Record<string, string> = {
+  '.png': 'image/png',
+  '.jpg': 'image/jpeg',
+  '.jpeg': 'image/jpeg',
+  '.gif': 'image/gif',
+  '.webp': 'image/webp',
+  '.svg': 'image/svg+xml',
+  '.gltf': 'model/gltf+json',
+  '.glb': 'model/gltf-binary',
+  '.obj': 'text/plain',
+  '.fbx': 'application/octet-stream',
+};
+
+export interface ResolvedAsset {
+  /** The http(s) URL to fetch, when the asset is remote. */
+  url?: string;
+  /** A readable stream of a local file, when the asset is on disk. */
+  stream?: NodeJS.ReadableStream;
+  contentType: string;
+}
+
+export type ResolveResult =
+  | { ok: true; asset: ResolvedAsset }
+  | { ok: false; reason: 'invalid' | 'not-found' };
+
+/**
+ * Resolve an asset reference to either a remote http(s) URL or a local file
+ * under `gamesRoot`. A reference with a scheme is remote; otherwise it's a
+ * game asset path relative to `gamesRoot`. Returns `{ ok: false }` with a
+ * reason when the reference is invalid (non-http scheme, path traversal) or
+ * the file is missing.
+ */
+export async function resolveAsset(
+  raw: string,
+  gamesRoot: string | undefined,
+): Promise<ResolveResult> {
+  // A relative path (no scheme) is a local game asset.
+  if (!/^[a-z][a-z0-9+.-]*:/i.test(raw)) {
+    if (!gamesRoot) return { ok: false, reason: 'invalid' };
+    const rel = raw.replace(/^\/+/, '');
+    const abs = path.resolve(gamesRoot, rel);
+    if (!abs.startsWith(path.resolve(gamesRoot) + path.sep)) {
+      return { ok: false, reason: 'invalid' };
+    }
+    try {
+      await stat(abs);
+    } catch {
+      return { ok: false, reason: 'not-found' };
+    }
+    const ext = path.extname(abs).toLowerCase();
+    return {
+      ok: true,
+      asset: {
+        stream: createReadStream(abs),
+        contentType: CONTENT_TYPES[ext] ?? 'application/octet-stream',
+      },
+    };
+  }
+
+  let url: URL;
+  try {
+    url = new URL(raw);
+  } catch {
+    return { ok: false, reason: 'invalid' };
+  }
+  // Only allow http(s) to avoid SSRF via file://, etc.
+  if (url.protocol !== 'http:' && url.protocol !== 'https:') {
+    return { ok: false, reason: 'invalid' };
+  }
+  return { ok: true, asset: { url: raw, contentType: 'application/octet-stream' } };
+}

apps/proxy/src/routes/trace.ts

@@ -4,6 +4,8 @@ import sharp from 'sharp';
 import { createRequire } from 'module';
 import { traceRequestSchema, type TraceResult } from '@tts/shared';
 import { offsetShape, parseSvgShape } from './svgShape.js';
+import { resolveAsset } from './resolveAsset.js';
+import { GAMES_ROOT } from '../config.js';
 
 // vtracer is a CommonJS package; load it via require so the wasm initializes
 // with the correct `__dirname`.
@@ -39,19 +41,29 @@ app.get('/', async (c) => {
   const { url, mode, threshold, format, simplify, maxColors, offset } =
     parsed.data;
 
-  // Only allow http(s) to avoid SSRF via file://, etc.
-  const parsedUrl = new URL(url);
-  if (parsedUrl.protocol !== 'http:' && parsedUrl.protocol !== 'https:') {
-    return c.json({ error: 'Only http(s) urls are allowed' }, 400);
+  // Resolve the image: a relative path is a local game asset under GAMES_ROOT;
+  // otherwise it must be an http(s) URL.
+  const resolved = await resolveAsset(url, GAMES_ROOT);
+  if (!resolved.ok) {
+    return c.json({ error: 'Invalid or missing image url' }, 400);
   }
+  const asset = resolved.asset;
 
   let image: Buffer;
   try {
-    const res = await fetch(url);
-    if (!res.ok) {
-      return c.json({ error: `Image responded ${res.status}` }, 502);
+    if (asset.stream) {
+      const chunks: Buffer[] = [];
+      for await (const chunk of asset.stream) {
+        chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
+      }
+      image = Buffer.concat(chunks);
+    } else {
+      const res = await fetch(asset.url!);
+      if (!res.ok) {
+        return c.json({ error: `Image responded ${res.status}` }, 502);
+      }
+      image = Buffer.from(await res.arrayBuffer());
     }
-    image = Buffer.from(await res.arrayBuffer());
   } catch (err) {
     return c.json({ error: `Failed to fetch image: ${String(err)}` }, 502);
   }

apps/web/package.json

@@ -21,7 +21,11 @@
     "@tts/extract": "workspace:*",
     "@tts/mesh": "workspace:*",
     "@tts/shared": "workspace:*",
+    "@tts/bgm": "workspace:*",
+    "@tts/http": "workspace:*",
+    "@tts/tabletop": "workspace:*",
     "bson": "^7.3.1",
+    "postprocessing": "^6.36.6",
     "react": "^19.2.8",
     "react-dom": "^19.2.8",
     "react-router-dom": "^7.18.2",

apps/web/src/App.tsx

@@ -1,30 +1,76 @@
-import { Link, Route, Routes } from 'react-router-dom';
+import { lazy, Suspense } from 'react';
+import { Link, Route, Routes, useLocation } from 'react-router-dom';
 import SearchPage from './pages/SearchPage';
 import ModPage from './pages/ModPage';
-import FullSetupPage from './pages/FullSetupPage';
+import ModHeader from './components/ModHeader';
+
+// The full-setup view and the bgm/tabletop pages pull in the whole three.js
+// stack (Scene + all mesh viewers + @tts/tabletop). Lazy-load them so that
+// stack stays code-split out of the main bundle and is only fetched when one
+// of those routes is actually visited.
+const FullSetupPage = lazy(() => import('./pages/FullSetupPage'));
+const BgmPage = lazy(() => import('./pages/BgmPage'));
+const BgmPackagePage = lazy(() => import('./pages/BgmPackagePage'));
+const PartsPage = lazy(() => import('./pages/PartsPage'));
+const PartPage = lazy(() => import('./pages/PartPage'));
+const SurfacesPage = lazy(() => import('./pages/SurfacesPage'));
+const SurfacePage = lazy(() => import('./pages/SurfacePage'));
+const SetupsPage = lazy(() => import('./pages/SetupsPage'));
+const SetupPage = lazy(() => import('./pages/SetupPage'));
 
 export default function App() {
+  const pathname = useLocation().pathname;
+  const isModRoute = pathname.startsWith('/mod/');
+  // The inspector view is full-bleed/viewport-height; the setup sub-route keeps the standard centered layout.
+  const isModView = /^\/mod\/[^/]+$/.test(pathname);
+
   return (
     <div className="min-h-screen bg-zinc-950 text-zinc-100">
-      <header className="border-b border-zinc-800">
-        <div className="mx-auto flex max-w-5xl items-center justify-between px-4 py-4">
-          <Link to="/" className="text-lg font-semibold tracking-tight">
-            TTS Workshop
-          </Link>
-          <nav className="flex gap-4 text-sm text-zinc-400">
-            <Link to="/" className="hover:text-zinc-100">
-              Search
+      {/* For the mod route the layout is full-bleed and fills the viewport so
+          the sidebar can scroll independently and the viewer gets all the space. */}
+      <div className={"flex min-h-screen flex-col " + (isModView ? "h-screen" : "")}>
+        <header className={"border-b border-zinc-800 " + (isModRoute ? "shrink-0" : "")}>
+        {isModRoute ? (
+          <ModHeader />
+        ) : (
+          <div className="mx-auto flex max-w-5xl items-center justify-between px-4 py-4">
+            <Link to="/" className="text-lg font-semibold tracking-tight">
+              TTS Workshop
             </Link>
-          </nav>
-        </div>
+            <nav className="flex gap-4 text-sm text-zinc-400">
+              <Link to="/" className="hover:text-zinc-100">
+                Search
+              </Link>
+              <Link to="/bgm" className="hover:text-zinc-100">
+                BGM
+              </Link>
+            </nav>
+          </div>
+        )}
       </header>
-      <main className="mx-auto max-w-5xl px-4 py-8">
+      <main className={(isModView ? "min-h-0 flex-1" : "mx-auto max-w-5xl px-4 py-8")}>
         <Routes>
           <Route path="/" element={<SearchPage />} />
           <Route path="/mod/:id" element={<ModPage />} />
-          <Route path="/mod/:id/setup" element={<FullSetupPage />} />
+          <Route
+            path="/mod/:id/setup"
+            element={
+              <Suspense fallback={<p className="text-sm text-zinc-400">Loading full setup…</p>}>
+                <FullSetupPage />
+              </Suspense>
+            }
+          />
+          <Route path="/bgm" element={<Suspense fallback={null}><BgmPage /></Suspense>} />
+          <Route path="/bgm/:id" element={<Suspense fallback={null}><BgmPackagePage /></Suspense>} />
+          <Route path="/bgm/:id/parts" element={<Suspense fallback={null}><PartsPage /></Suspense>} />
+          <Route path="/bgm/:id/parts/:type/:part" element={<Suspense fallback={null}><PartPage /></Suspense>} />
+          <Route path="/bgm/:id/surfaces" element={<Suspense fallback={null}><SurfacesPage /></Suspense>} />
+          <Route path="/bgm/:id/surfaces/:type/:surface" element={<Suspense fallback={null}><SurfacePage /></Suspense>} />
+          <Route path="/bgm/:id/setups" element={<Suspense fallback={null}><SetupsPage /></Suspense>} />
+          <Route path="/bgm/:id/setups/:type/:setup" element={<Suspense fallback={null}><SetupPage /></Suspense>} />
         </Routes>
       </main>
+      </div>
     </div>
   );
 }

apps/web/src/api.ts

@@ -1,5 +1,7 @@
-import { deserialize } from 'bson';
-import type { SearchResult, TraceResult, TTSMod } from '@tts/shared';
+import type { ModDetails, SearchResult } from '@tts/shared';
+import { traceImage } from '@tts/http';
+
+export { traceImage };
 
 const BASE = '';
 
@@ -19,32 +21,13 @@ export function searchWorkshop(q: string, page = 1): Promise<SearchResult> {
 }
 
 /**
- * Trace an image into a vector shape, BSON-deserializing the proxy response.
- * `mode` controls how the region is derived (`alpha`, `bw`, `color`); a
- * non-zero `offset` insets (negative) or outsets (positive) the shape in
- * pixels.
+ * Fetch a full parsed TTS save plus its Workshop metadata.
  */
-export async function traceImage(
-  url: string,
-  mode: 'alpha' | 'bw' | 'color' = 'alpha',
-  offset?: number,
-): Promise<TraceResult> {
-  const params = new URLSearchParams({ url, mode });
-  if (offset !== undefined) params.set('offset', String(offset));
-  const res = await fetch(`${BASE}/trace?${params.toString()}`);
-  if (!res.ok) {
-    const body = (await res.json().catch(() => null)) as { error?: string } | null;
-    throw new Error(body?.error ?? `Trace failed (${res.status})`);
-  }
-  return deserialize(new Uint8Array(await res.arrayBuffer())) as TraceResult;
-}
-
-/** Fetch a full parsed TTS save. */
-export function fetchMod(id: string, fileUrl?: string): Promise<TTSMod> {
+export function fetchMod(id: string, fileUrl?: string): Promise<ModDetails> {
   const params = new URLSearchParams();
   if (fileUrl) params.set('fileUrl', fileUrl);
   const qs = params.toString();
-  return getJson<TTSMod>(`/items/${id}${qs ? `?${qs}` : ''}`);
+  return getJson<ModDetails>(`/items/${id}${qs ? `?${qs}` : ''}`);
 }
 
 /** Build a URL for the raw save file download. */

apps/web/src/components/Breadcrumbs.tsx

@@ -0,0 +1,33 @@
+import { Link } from 'react-router-dom';
+
+export interface Crumb {
+  label: string;
+  /** Where the crumb links; omit for the current (last) crumb. */
+  to?: string;
+}
+
+/**
+ * A breadcrumb navigation trail. The last crumb is the current page and is
+ * rendered as plain text; earlier crumbs link to their routes.
+ */
+export default function Breadcrumbs({ crumbs }: { crumbs: Crumb[] }) {
+  return (
+    <nav aria-label="Breadcrumb" className="flex flex-wrap items-center gap-1 text-sm text-zinc-400">
+      {crumbs.map((crumb, i) => {
+        const last = i === crumbs.length - 1;
+        return (
+          <span key={i} className="flex items-center gap-1">
+            {i > 0 && <span className="text-zinc-600">/</span>}
+            {crumb.to && !last ? (
+              <Link to={crumb.to} className="hover:text-zinc-100">
+                {crumb.label}
+              </Link>
+            ) : (
+              <span className={last ? 'text-zinc-100' : ''}>{crumb.label}</span>
+            )}
+          </span>
+        );
+      })}
+    </nav>
+  );
+}

apps/web/src/components/ModHeader.tsx

@@ -0,0 +1,62 @@
+import { useMemo } from 'react';
+import { Link, useParams } from 'react-router-dom';
+import { buildTree, collectRefs } from '@tts/extract';
+import { useModStore } from '../stores/modStore';
+import { useSearchStore } from '../stores/searchStore';
+import { modFileUrl } from '../api';
+
+/**
+ * Replaces the global site header on the mod page: thumbnail, game name, and
+ * a subheader with the mod id and stats, plus download/setup links styled like
+ * the Search/BGM nav.
+ */
+export default function ModHeader() {
+  const { id } = useParams<{ id: string }>();
+  const { mod } = useModStore();
+  const item = useSearchStore((s) => s.items.find((i) => i.id === id));
+  const tree = useMemo(() => (mod ? buildTree(mod.mod) : []), [mod]);
+  const refs = useMemo(() => (mod ? collectRefs(mod.mod) : []), [mod]);
+  // Prefer the metadata fetched with the save (survives a refresh); fall back
+  // to the search result for the brief moment before the save loads.
+  const title = mod?.title ?? item?.title;
+  const previewImageUrl = mod?.previewImageUrl ?? item?.previewImageUrl;
+
+  return (
+    <div className="mx-auto flex max-w-5xl items-center justify-between gap-4 px-4 py-4">
+      <div className="flex min-w-0 items-center gap-3">
+        {previewImageUrl && (
+          <img
+            src={previewImageUrl}
+            alt={title}
+            className="h-12 w-12 shrink-0 rounded-lg border border-zinc-800 object-cover"
+          />
+        )}
+        <div className="min-w-0">
+          <h1 className="truncate text-lg font-semibold tracking-tight">
+            {title ?? `Mod ${id}`}
+          </h1>
+          {mod && (
+            <p className="truncate text-sm text-zinc-400">
+              <span className="font-mono">{id}</span> · {mod.mod.GameMode} ·{' '}
+              {mod.mod.Date} · {tree.length} objects · {refs.length} asset refs
+            </p>
+          )}
+        </div>
+      </div>
+      <nav className="flex shrink-0 gap-4 text-sm text-zinc-400">
+        <Link to="/" className="hover:text-zinc-100">
+          Search
+        </Link>
+        <a
+          href={modFileUrl(id!, item?.fileUrl)}
+          className="hover:text-zinc-100"
+        >
+          Download
+        </a>
+        <Link to={`/mod/${id}/setup`} className="hover:text-zinc-100">
+          Setup
+        </Link>
+      </nav>
+    </div>
+  );
+}

apps/web/src/components/ObjectTree.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useMemo, useState } from 'react';
 import { Icon } from '@iconify/react';
 import type { ObjectTreeNode } from '@tts/extract';
 import { iconsForObject } from './objectIcons';
@@ -10,19 +10,85 @@ interface Props {
 }
 
 export default function ObjectTree({ nodes, selectedPath, onSelect }: Props) {
+  const [highlighted, setHighlighted] = useState<Set<string>>(() => new Set());
+
+  const types = useMemo(() => collectTypes(nodes), [nodes]);
+
+  // When nothing is highlighted, every type is shown. Otherwise only the
+  // highlighted types are visible.
+  const visibleNodes = useMemo(
+    () => filterTree(nodes, highlighted),
+    [nodes, highlighted],
+  );
+
+  const toggleType = (name: string) =>
+    setHighlighted((prev) => {
+      const next = new Set(prev);
+      if (next.has(name)) next.delete(name);
+      else next.add(name);
+      return next;
+    });
+
+  const clearAll = () => setHighlighted(new Set());
+
   return (
-    <ul className="space-y-0.5">
-      {nodes.map((node, index) => (
-        <TreeNode
-          key={index}
-          node={node}
-          depth={0}
-          path={`${index}`}
-          selectedPath={selectedPath}
-          onSelect={onSelect}
-        />
-      ))}
-    </ul>
+    <div className="flex h-full min-h-0 flex-col">
+      {types.length > 0 && (
+        <div className="shrink-0 border-b border-zinc-800 p-3 pb-2">
+          <div className="grid grid-cols-6 gap-1">
+            {types.map(({ name, count }) => {
+              const active = highlighted.has(name);
+              return (
+                <button
+                  key={name}
+                  onClick={() => toggleType(name)}
+                  aria-pressed={active}
+                  title={`${name} (${count}) — ${active ? 'unhighlight' : 'highlight'}`}
+                  className={`relative flex h-8 items-center justify-center rounded-md border transition-colors ${
+                    active
+                      ? 'border-zinc-300 bg-zinc-700 text-zinc-100'
+                      : 'border-zinc-800 text-zinc-400 hover:border-zinc-600 hover:text-zinc-200'
+                  }`}
+                >
+                  {iconsForObject(name).map((icon) => (
+                    <Icon key={icon} icon={icon} className="h-4 w-4" />
+                  ))}
+                  <span
+                    className={`absolute -bottom-1 -right-1 rounded bg-zinc-950 px-0.5 font-mono text-[9px] leading-tight ${
+                      active ? 'text-zinc-200' : 'text-zinc-500'
+                    }`}
+                  >
+                    {count}
+                  </span>
+                </button>
+              );
+            })}
+          </div>
+          {highlighted.size > 0 && (
+            <div className="mt-1.5 flex justify-end">
+              <button
+                onClick={clearAll}
+                className="inline-flex items-center rounded px-1.5 py-0.5 text-xs text-zinc-500 hover:text-zinc-200"
+              >
+                Clear
+              </button>
+            </div>
+          )}
+        </div>
+      )}
+      <ul className="min-h-0 flex-1 space-y-0.5 overflow-y-auto p-3 pt-2">
+        {visibleNodes.map(({ node, path }) => (
+          <TreeNode
+            key={path}
+            node={node}
+            depth={0}
+            path={path}
+            selectedPath={selectedPath}
+            onSelect={onSelect}
+          />
+        ))}
+      </ul>
+    </div>
   );
 }
 
@@ -84,6 +150,16 @@ function TreeNode({
             ))}
           </span>
           <span className="truncate">{node.label}</span>
+          {hasChildren && (
+            <span
+              title={`${node.children.length} ${
+                node.children.length === 1 ? 'child' : 'children'
+              }`}
+              className="ml-1.5 shrink-0 rounded bg-zinc-800 px-1 font-mono text-[10px] leading-4 text-zinc-500"
+            >
+              {node.children.length}
+            </span>
+          )}
         </button>
       </div>
       {hasChildren && expanded && (
@@ -102,4 +178,51 @@ function TreeNode({
       )}
     </li>
   );
+}
+
+/** Distinct object types present in the tree, with a count of each. */
+function collectTypes(nodes: ObjectTreeNode[]): { name: string; count: number }[] {
+  const counts = new Map<string, number>();
+  const visit = (node: ObjectTreeNode) => {
+    counts.set(node.object.Name, (counts.get(node.object.Name) ?? 0) + 1);
+    node.children.forEach(visit);
+  };
+  nodes.forEach(visit);
+  return [...counts.entries()]
+    .map(([name, count]) => ({ name, count }))
+    .sort((a, b) => a.name.localeCompare(b.name));
+}
+
+/**
+ * Keep a node when its type is highlighted or any descendant survives, so the
+ * containment hierarchy is preserved and highlighted parents still lead to
+ * highlighted children. With nothing highlighted, every node is kept.
+ *
+ * Each result carries the node's original index path into the full (unfiltered)
+ * tree, so selection stays stable regardless of filtering.
+ */
+function filterTree(
+  nodes: ObjectTreeNode[],
+  highlighted: Set<string>,
+  prefix = '',
+): { node: ObjectTreeNode; path: string }[] {
+  const result: { node: ObjectTreeNode; path: string }[] = [];
+  nodes.forEach((node, index) => {
+    const path = prefix ? `${prefix}-${index}` : `${index}`;
+    const children = filterTree(node.children, highlighted, path);
+    const visible =
+      highlighted.size === 0 ||
+      highlighted.has(node.object.Name) ||
+      children.length > 0;
+    if (visible) {
+      result.push({
+        node:
+          children.length > 0
+            ? { ...node, children: children.map((c) => c.node) }
+            : node,
+        path,
+      });
+    }
+  });
+  return result;
 }

apps/web/src/components/PackageMissing.tsx

@@ -0,0 +1,15 @@
+import { Link } from 'react-router-dom';
+import Breadcrumbs from './Breadcrumbs';
+
+/** Shown when a bgm package id doesn't resolve to a known package. */
+export default function PackageMissing({ id }: { id: string }) {
+  return (
+    <div className="space-y-4">
+      <Breadcrumbs crumbs={[{ label: 'Board games', to: '/bgm' }, { label: id }]} />
+      <p className="text-sm text-zinc-400">No package “{id}”.</p>
+      <Link to="/bgm" className="text-sm text-zinc-300 underline">
+        Back to all packages
+      </Link>
+    </div>
+  );
+}

apps/web/src/components/tabletop/TabletopScene.tsx

@@ -0,0 +1,87 @@
+import { Suspense, useMemo, useState } from 'react';
+import { Icon } from '@iconify/react';
+import type { SerializedPackage, Setup } from '@tts/bgm';
+import {
+  SetupLoader,
+  WorldSurfaceView,
+  HudSurfaceView,
+  resolveMountTree,
+  serializedToPackage,
+  useTabletopStore,
+  MM_TO_WORLD,
+} from '@tts/tabletop';
+import Scene from '../viewers/Scene';
+
+/**
+ * Render a bgm setup as an interactive 3D table.
+ *
+ * Seeds the tabletop store from the setup, resolves the surface mount tree,
+ * and renders each enabled surface — world surfaces in world space, HUD
+ * surfaces as an overlay — with their parts placed on routes. The store is
+ * seeded on every render so a setup change re-seeds it.
+ */
+export default function TabletopScene({
+  pkg,
+  setup,
+}: {
+  pkg: SerializedPackage;
+  setup: Setup;
+}) {
+  const packageData = useMemo(() => serializedToPackage(pkg), [pkg]);
+  const surfaces = useTabletopStore((s) => s.surfaces);
+  const [showSurface, setShowSurface] = useState(false);
+
+  const tree = useMemo(
+    () => resolveMountTree(packageData.surfaces, new Set(Object.keys(surfaces))),
+    [packageData, surfaces],
+  );
+
+  // Size the contact shadow to cover 2x the largest enabled surface, so the
+  // shadow plane always extends past the table. Surface sizes are in mm;
+  // `MM_TO_WORLD` converts to world units.
+  const shadowScale = useMemo(() => {
+    let maxMm = 0;
+    for (const [id, enabled] of Object.entries(surfaces)) {
+      if (!enabled) continue;
+      const surface = packageData.surfaces.get(id);
+      if (!surface?.size) continue;
+      maxMm = Math.max(maxMm, ...surface.size);
+    }
+    return maxMm > 0 ? maxMm * 2 * MM_TO_WORLD : 22;
+  }, [packageData, surfaces]);
+
+  return (
+    <Scene
+      autoRotate={false}
+      enablePan
+      fullscreen
+      shadowScale={shadowScale}
+      // Keep the camera above the table so face-down cards can't be peeked
+      // from below. π/2 clamps the polar angle at the horizon.
+      maxPolarAngle={Math.PI / 2}
+      overlay={
+        <button
+          onClick={() => setShowSurface((v) => !v)}
+          title={showSurface ? 'Hide surfaces' : 'Show surfaces'}
+          aria-label={showSurface ? 'Hide surfaces' : 'Show surfaces'}
+          className="absolute right-2 top-10 z-10 flex h-8 w-8 items-center justify-center rounded-md border border-zinc-700 bg-zinc-900/80 text-zinc-300 backdrop-blur transition hover:bg-zinc-800 hover:text-zinc-100"
+        >
+          <Icon
+            icon={showSurface ? 'mdi:view-grid' : 'mdi:view-grid-outline'}
+            className="h-5 w-5"
+          />
+        </button>
+      }
+    >
+      <SetupLoader pkg={packageData} setup={setup} />
+      <Suspense fallback={null}>
+        {tree.world.map((node) => (
+          <WorldSurfaceView key={node.id} pkg={packageData} node={node} showSurface={showSurface} />
+        ))}
+        {tree.hud.map((node) => (
+          <HudSurfaceView key={node.id} pkg={packageData} node={node} showSurface={showSurface} />
+        ))}
+      </Suspense>
+    </Scene>
+  );
+}

apps/web/src/components/viewers.tsx

@@ -8,7 +8,14 @@ import type { TTSObject } from '@tts/shared';
 export interface ObjectViewer {
   /** The object class this viewer handles, e.g. `Card`, `Bag`. */
   name: string;
-  component: (props: { object: TTSObject }) => ReactNode;
+  component: (props: ViewerProps) => ReactNode;
+}
+
+/** Props passed to every object viewer. */
+export interface ViewerProps {
+  object: TTSObject;
+  /** Expand the 3D scene to fill its container instead of the default frame. */
+  fill?: boolean;
 }
 
 const registry = new Map<string, ObjectViewer['component']>();
@@ -24,7 +31,7 @@ export function resolveViewer(object: TTSObject): ObjectViewer['component'] {
 }
 
 /** The default viewer: a plain inspection of the object's fields. */
-export function DefaultViewer({ object }: { object: TTSObject }) {
+export function DefaultViewer({ object }: ViewerProps) {
   return (
     <dl className="grid grid-cols-1 gap-2 text-sm sm:grid-cols-2">
       {Object.entries(object).map(([key, value]) => {

apps/web/src/components/viewers/CardMesh.tsx

@@ -0,0 +1,180 @@
+import { useTexture } from '@react-three/drei';
+import { useMemo } from 'react';
+import * as THREE from 'three';
+import type { TTSObject } from '@tts/shared';
+import {
+  extrudeShapeParts,
+  roundedRectShape,
+  type ExtrudedGeometry,
+} from '@tts/mesh';
+import { assetUrl } from '@tts/http';
+import { cardAspect, resolveCardConfig, spriteUv } from './cardResolution';
+import { applyMapTransform } from './cardMaterial';
+import {
+  getSharedGeometry,
+  getSharedMaterial,
+  objectTint,
+  tintKey,
+  tintedColor,
+} from './sharedResources';
+
+/** Longer card dimension, in world units. */
+const CARD_LENGTH = 2;
+/** Corner radius as a fraction of the shorter card edge. */
+const CORNER_RADIUS = 0.05;
+/** Thickness of the card, as a fraction of its length (real cards are ~0.3%). */
+const CARD_THICKNESS = 0.01;
+
+// A 1x1 transparent placeholder so `useTexture` always receives a valid URL.
+// Without it, the face/back hooks would be called conditionally, which breaks
+// React's rules of hooks when switching between objects with different URL
+// combinations (e.g. a deck with a back vs. a `CardCustom` with only an image).
+const FALLBACK_URL =
+  'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7';
+
+/**
+ * The card mesh for an object, exported so the full-setup view can compose it
+ * into a shared scene.
+ */
+export function CardObjectMesh({ object }: { object: TTSObject }) {
+  const { cardId, faceUrl, backUrl, numWidth, numHeight, uniqueBack } =
+    resolveCardConfig(object);
+
+  return (
+    <CardMesh
+      faceUrl={faceUrl}
+      backUrl={backUrl}
+      numWidth={numWidth}
+      numHeight={numHeight}
+      uniqueBack={uniqueBack}
+      cardId={cardId}
+      tint={objectTint(object)}
+    />
+  );
+}
+
+// Rendered inside the Canvas so `useTexture` can access the R3F store.
+// Exported so the full-setup view can compose it into a shared scene.
+export function CardMesh({
+  faceUrl,
+  backUrl,
+  numWidth,
+  numHeight,
+  uniqueBack,
+  cardId,
+  tint,
+}: {
+  faceUrl?: string;
+  backUrl?: string;
+  numWidth?: number;
+  numHeight?: number;
+  uniqueBack: boolean;
+  cardId?: number;
+  tint: THREE.Color;
+}) {
+  // Always call both hooks so the hook count is stable across renders. The
+  // placeholder is used only when a URL is absent; presence is checked via the
+  // URL strings below, not the texture objects.
+  const face = useTexture(faceUrl ? assetUrl(faceUrl) : FALLBACK_URL);
+  const back = useTexture(backUrl ? assetUrl(backUrl) : FALLBACK_URL);
+
+  // Card art is sRGB-encoded. `TextureLoader` leaves `colorSpace` as
+  // `NoColorSpace`, which uploads the texture as linear and then double-decodes
+  // it in the shader, washing out contrast. Mark it sRGB so the GPU decodes it
+  // once, correctly. Clones (e.g. `flipTexture`) inherit this from the source.
+  face.colorSpace = THREE.SRGBColorSpace;
+  back.colorSpace = THREE.SRGBColorSpace;
+
+  // The face/back textures are shared (drei caches them by URL); each card's
+  // sprite cell is selected via a per-material UV transform injected into the
+  // shader, so no per-card texture clone (and no re-upload) is needed. The
+  // transform is baked into the material's shader, so it must be keyed into the
+  // shared-material cache to avoid mutating a material used by another card.
+  const faceMap = faceUrl ? face : null;
+  const backMap = backUrl ? back : null;
+
+  const tintK = tintKey(tint);
+  const faceUv = faceUrl ? spriteUv(cardId, numWidth, numHeight) : null;
+  const backUv = backUrl
+    ? uniqueBack
+      ? spriteUv(cardId, numWidth, numHeight)
+      : { repeatX: 1, repeatY: 1, offsetX: 0, offsetY: 0 }
+    : null;
+
+  // Key by URL + card id + tint: the URL disambiguates different sheets (and
+  // `CardCustom` objects, which have no `CardID`), the card id selects the
+  // sprite cell, and the tint bakes the per-object color in.
+  const faceMat = getSharedMaterial(`card-face:${faceUrl ?? 'none'}:${cardId ?? 'none'}:${tintK}`, {
+    color: tintedColor(faceMap ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
+    map: faceMap ?? undefined,
+    roughness: 0.6,
+  });
+  if (faceUv) {
+    applyMapTransform(faceMat, new THREE.Vector2(faceUv.repeatX, faceUv.repeatY), new THREE.Vector2(faceUv.offsetX, faceUv.offsetY));
+  }
+
+  const backMat = getSharedMaterial(`card-back:${backUrl ?? 'none'}:${cardId ?? 'none'}:${tintK}`, {
+    color: tintedColor(backMap ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
+    map: backMap ?? undefined,
+    roughness: 0.6,
+  });
+  if (backUv) {
+    // The back cap maps with the same planar UVs as the front, so mirror the
+    // sprite cell left/right to read correctly instead of appearing mirrored.
+    // Negating repeat.x and shifting offset.x by one repeat keeps the visible
+    // region in place while mirrored (see `flipTexture`).
+    applyMapTransform(
+      backMat,
+      new THREE.Vector2(-backUv.repeatX, backUv.repeatY),
+      new THREE.Vector2(backUv.offsetX + backUv.repeatX, backUv.offsetY),
+    );
+  }
+
+  const wallMat = getSharedMaterial(`card-wall:${tintK}`, {
+    color: tintedColor(new THREE.Color('#ffffff'), tint),
+    roughness: 0.6,
+  });
+
+  // Build the rounded-rect geometry from the card sprite's aspect ratio. The
+  // front and back faces each get their own material; the walls are a solid
+  // white, matching TTS card tinting. Geometry is shared across cards of the
+  // same size so the full-setup view reuses it; the face/back materials are
+  // shared per card (keyed by card id + tint) and carry the sprite UV transform.
+  const { frontGeo, backGeo, wallsGeo } = useMemo(() => {
+    const img = (faceUrl ? face.image : backUrl ? back.image : undefined) as
+      | HTMLImageElement
+      | undefined;
+    const aspect = cardAspect(img, numWidth, numHeight);
+    const width = CARD_LENGTH * aspect;
+    const height = CARD_LENGTH;
+    // Radius scales with the shorter edge so corners look proportional and
+    // stay circular (no scaling distortion).
+    const shape = roundedRectShape(width, height, CORNER_RADIUS * Math.min(width, height));
+    const parts = extrudeShapeParts(shape, { height: CARD_THICKNESS });
+    const key = `card:${width}:${height}:${CARD_THICKNESS}`;
+    return {
+      frontGeo: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
+      backGeo: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
+      wallsGeo: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
+    };
+  }, [faceUrl, face, backUrl, back, numWidth, numHeight]);
+
+  return (
+    <group>
+      <mesh geometry={frontGeo} material={faceMat} />
+      <mesh geometry={backGeo} material={backMat} />
+      <mesh geometry={wallsGeo} material={wallMat} />
+    </group>
+  );
+}
+
+/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
+function toGeometry(extruded: ExtrudedGeometry) {
+  const { positions, normals, uvs, indices } = extruded;
+  const geo = new THREE.BufferGeometry();
+  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
+  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
+  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
+  geo.setIndex(new THREE.BufferAttribute(indices, 1));
+  return geo;
+}

apps/web/src/components/viewers/CardViewer.tsx

@@ -1,31 +1,7 @@
-import { useTexture } from '@react-three/drei';
-import { useMemo } from 'react';
-import * as THREE from 'three';
 import type { TTSObject } from '@tts/shared';
-import {
-  extrudeShapeParts,
-  roundedRectShape,
-  type ExtrudedGeometry,
-} from '@tts/mesh';
 import Scene from './Scene';
-import { assetUrl } from './assetUrl';
-import { cardAspect, resolveCardConfig, spriteUv } from './cardResolution';
-import { flipTexture } from './flipTexture';
-import { getSharedGeometry, objectTint, tintedColor } from './sharedResources';
-
-/** Longer card dimension, in world units. */
-const CARD_LENGTH = 2;
-/** Corner radius as a fraction of the shorter card edge. */
-const CORNER_RADIUS = 0.05;
-/** Thickness of the card. */
-const CARD_THICKNESS = 0.06;
-
-// A 1x1 transparent placeholder so `useTexture` always receives a valid URL.
-// Without it, the face/back hooks would be called conditionally, which breaks
-// React's rules of hooks when switching between objects with different URL
-// combinations (e.g. a deck with a back vs. a `CardCustom` with only an image).
-const FALLBACK_URL =
-  'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7';
+import { CardObjectMesh } from './CardMesh';
+import type { ViewerProps } from '../viewers';
 
 /**
  * A playing card: a thin rounded rect with the face texture on the front and
@@ -49,140 +25,17 @@ const FALLBACK_URL =
  * It is flipped left/right so it isn't mirrored when viewed from the back of
  * the card.
  */
-export default function CardViewer({ object }: { object: TTSObject }) {
+export default function CardViewer({ object, fill }: ViewerProps) {
   return (
-    <Scene>
-      <CardObjectMesh object={object} />
+    <Scene fill={fill}>
+      {/* Cards are authored standing (face in XY, thickness along Z); lay them
+          flat on the ground so the face points up like a card on a table, which
+          is also what the contact shadow needs to project. */}
+      <group rotation={[-Math.PI / 2, 0, 0]}>
+        <CardObjectMesh object={object} />
+      </group>
     </Scene>
   );
 }
 
-/**
- * The card mesh for an object, exported so the full-setup view can compose it
- * into a shared scene.
- */
-export function CardObjectMesh({ object }: { object: TTSObject }) {
-  const { cardId, faceUrl, backUrl, numWidth, numHeight, uniqueBack } =
-    resolveCardConfig(object);
-
-  return (
-    <CardMesh
-      faceUrl={faceUrl}
-      backUrl={backUrl}
-      numWidth={numWidth}
-      numHeight={numHeight}
-      uniqueBack={uniqueBack}
-      cardId={cardId}
-      tint={objectTint(object)}
-    />
-  );
-}
-
-// Rendered inside the Canvas so `useTexture` can access the R3F store.
-// Exported so the full-setup view can compose it into a shared scene.
-export function CardMesh({
-  faceUrl,
-  backUrl,
-  numWidth,
-  numHeight,
-  uniqueBack,
-  cardId,
-  tint,
-}: {
-  faceUrl?: string;
-  backUrl?: string;
-  numWidth?: number;
-  numHeight?: number;
-  uniqueBack: boolean;
-  cardId?: number;
-  tint: THREE.Color;
-}) {
-  // Always call both hooks so the hook count is stable across renders. The
-  // placeholder is used only when a URL is absent; presence is checked via the
-  // URL strings below, not the texture objects.
-  const face = useTexture(faceUrl ? assetUrl(faceUrl) : FALLBACK_URL);
-  const back = useTexture(backUrl ? assetUrl(backUrl) : FALLBACK_URL);
-
-  // Front texture: the sprite cell from the sheet (or the full image when there
-  // is no grid). Cloned so the sprite offset/repeat don't leak into other cards
-  // that share the same sheet URL (drei caches textures globally by URL).
-  const faceMap = useMemo(() => {
-    if (!faceUrl) return null;
-    const tex = face.clone();
-    const { repeatX, repeatY, offsetX, offsetY } = spriteUv(cardId, numWidth, numHeight);
-    tex.repeat.set(repeatX, repeatY);
-    tex.offset.set(offsetX, offsetY);
-    return tex;
-  }, [faceUrl, face, cardId, numWidth, numHeight]);
-
-  // Back texture: a single full image (tile) unless the deck has unique backs,
-  // in which case it's a sheet too. Flipped left/right so it reads correctly
-  // instead of being mirrored on the back face.
-  const backMap = useMemo(() => {
-    if (!backUrl) return null;
-    const tex = back.clone();
-    const { repeatX, repeatY, offsetX, offsetY } = uniqueBack
-      ? spriteUv(cardId, numWidth, numHeight)
-      : { repeatX: 1, repeatY: 1, offsetX: 0, offsetY: 0 };
-    tex.repeat.set(repeatX, repeatY);
-    tex.offset.set(offsetX, offsetY);
-    return flipTexture(tex);
-  }, [backUrl, back, uniqueBack, cardId, numWidth, numHeight]);
-
-  // Build the rounded-rect geometry from the card sprite's aspect ratio. The
-  // front and back faces each get their own material; the walls are a solid
-  // white, matching TTS card tinting. Geometry is shared across cards of the
-  // same size so the full-setup view reuses it; the face/back materials stay
-  // per-card because each card clones its texture for sprite UVs.
-  const { frontGeo, backGeo, wallsGeo } = useMemo(() => {
-    const img = (faceUrl ? face.image : backUrl ? back.image : undefined) as
-      | HTMLImageElement
-      | undefined;
-    const aspect = cardAspect(img, numWidth, numHeight);
-    const width = CARD_LENGTH * aspect;
-    const height = CARD_LENGTH;
-    // Radius scales with the shorter edge so corners look proportional and
-    // stay circular (no scaling distortion).
-    const shape = roundedRectShape(width, height, CORNER_RADIUS * Math.min(width, height));
-    const parts = extrudeShapeParts(shape, { height: CARD_THICKNESS });
-    const key = `card:${width}:${height}:${CARD_THICKNESS}`;
-    return {
-      frontGeo: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
-      backGeo: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
-      wallsGeo: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
-    };
-  }, [faceUrl, face, backUrl, back, numWidth, numHeight]);
-
-  return (
-    <group>
-      <mesh geometry={frontGeo}>
-        <meshStandardMaterial
-          color={tintedColor(faceMap ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint)}
-          map={faceMap ?? undefined}
-          roughness={0.6}
-        />
-      </mesh>
-      <mesh geometry={backGeo}>
-        <meshStandardMaterial
-          color={tintedColor(backMap ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint)}
-          map={backMap ?? undefined}
-          roughness={0.6}
-        />
-      </mesh>
-      <mesh geometry={wallsGeo}>
-        <meshStandardMaterial color={tintedColor(new THREE.Color('#ffffff'), tint)} roughness={0.6} />
-      </mesh>
-    </group>
-  );
-}
-
-/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
-function toGeometry(extruded: ExtrudedGeometry) {
-  const { positions, normals, uvs, indices } = extruded;
-  const geo = new THREE.BufferGeometry();
-  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
-  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
-  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
-  geo.setIndex(new THREE.BufferAttribute(indices, 1));
-  return geo;
-}
+export { CardObjectMesh, CardMesh } from './CardMesh';

apps/web/src/components/viewers/CustomModelMesh.tsx

@@ -0,0 +1,108 @@
+import { Suspense, useLayoutEffect } from 'react';
+import { useLoader } from '@react-three/fiber';
+import { useTexture } from '@react-three/drei';
+import type { TTSObject } from '@tts/shared';
+import * as THREE from 'three';
+import type { Object3D } from 'three';
+import { assetUrl } from '@tts/http';
+import { FlexibleModelLoader } from './flexibleModelLoader';
+import { objectTint, tintedColor } from './sharedResources';
+
+/**
+ * The mesh content for a custom model, exported so the full-setup view can
+ * compose it into a shared scene. Renders the model from `CustomMesh.MeshURL`
+ * (or a neutral box placeholder when absent).
+ */
+export function CustomModelMesh({ object }: { object: TTSObject }) {
+  const meshUrl = object.CustomMesh?.MeshURL;
+  const tint = objectTint(object);
+  if (!meshUrl) {
+    return (
+      <mesh>
+        <boxGeometry args={[1, 1, 1]} />
+        <meshStandardMaterial color={tintedColor(new THREE.Color('#52525b'), tint)} />
+      </mesh>
+    );
+  }
+
+  return (
+    <Suspense fallback={null}>
+      <Model
+        meshUrl={meshUrl}
+        diffuseUrl={object.CustomMesh?.DiffuseURL}
+        tint={tint}
+      />
+    </Suspense>
+  );
+}
+
+function Model({
+  meshUrl,
+  diffuseUrl,
+  tint,
+}: {
+  meshUrl: string;
+  diffuseUrl?: string;
+  tint: THREE.Color;
+}) {
+  const root = useLoader(FlexibleModelLoader, assetUrl(meshUrl));
+
+  return (
+    <>
+      <primitive object={root} scale={0.5} />
+      {diffuseUrl && <DiffuseTexture root={root} url={diffuseUrl} />}
+      <Tint root={root} tint={tint} />
+    </>
+  );
+}
+
+// Apply the object's tint to every material on the loaded model, multiplying
+// the existing color. Rendered after the model so it runs once the materials
+// exist.
+function Tint({ root, tint }: { root: Object3D; tint: THREE.Color }) {
+  useLayoutEffect(() => {
+    root.traverse((child) => {
+      const mesh = child as THREE.Mesh;
+      if (mesh.isMesh) {
+        const material = Array.isArray(mesh.material)
+          ? mesh.material[0]
+          : mesh.material;
+        if (material && 'color' in material) {
+          (material as THREE.MeshStandardMaterial).color.multiply(tint);
+          material.needsUpdate = true;
+        }
+      }
+    });
+  }, [root, tint]);
+
+  return null;
+}
+
+// Rendered inside the Canvas so `useTexture` can access the R3F store. Only
+// mounted when a diffuse URL exists, so the hook count stays consistent.
+function DiffuseTexture({ root, url }: { root: Object3D; url: string }) {
+  const texture = useTexture(assetUrl(url));
+
+  // Diffuse art is sRGB-encoded; `TextureLoader` leaves `colorSpace` as
+  // `NoColorSpace`, which double-decodes it in the shader and washes out
+  // contrast. Mark it sRGB so the GPU decodes it once, correctly.
+  texture.colorSpace = THREE.SRGBColorSpace;
+
+  // Apply the diffuse texture to every mesh material on the loaded model.
+  useLayoutEffect(() => {
+    root.traverse((child) => {
+      const mesh = child as THREE.Mesh;
+      if (mesh.isMesh) {
+        const material = Array.isArray(mesh.material)
+          ? mesh.material[0]
+          : mesh.material;
+        if (material && 'map' in material) {
+          material.map = texture;
+          material.needsUpdate = true;
+        }
+      }
+    });
+  }, [root, texture]);
+
+  return null;
+}

apps/web/src/components/viewers/CustomModelViewer.tsx

@@ -1,13 +1,7 @@
-import { Suspense, useLayoutEffect } from 'react';
-import { useLoader } from '@react-three/fiber';
-import { useTexture } from '@react-three/drei';
 import type { TTSObject } from '@tts/shared';
-import * as THREE from 'three';
-import type { Object3D } from 'three';
 import Scene from './Scene';
-import { assetUrl } from './assetUrl';
-import { FlexibleModelLoader } from './flexibleModelLoader';
-import { objectTint, tintedColor } from './sharedResources';
+import { CustomModelMesh } from './CustomModelMesh';
+import type { ViewerProps } from '../viewers';
 
 /**
  * A custom 3D model loaded from `CustomMesh.MeshURL`. Supports GLTF/GLB, OBJ,
@@ -15,104 +9,12 @@ import { objectTint, tintedColor } from './sharedResources';
  * (TTS model URLs are often extension-less). `DiffuseURL` is applied to the
  * model's materials when present.
  */
-export default function CustomModelViewer({ object }: { object: TTSObject }) {
+export default function CustomModelViewer({ object, fill }: ViewerProps) {
   return (
-    <Scene>
+    <Scene fill={fill}>
       <CustomModelMesh object={object} />
     </Scene>
   );
 }
 
-/**
- * The mesh content for a custom model, exported so the full-setup view can
- * compose it into a shared scene. Renders the model from `CustomMesh.MeshURL`
- * (or a neutral box placeholder when absent).
- */
-export function CustomModelMesh({ object }: { object: TTSObject }) {
-  const meshUrl = object.CustomMesh?.MeshURL;
-  const tint = objectTint(object);
-  if (!meshUrl) {
-    return (
-      <mesh>
-        <boxGeometry args={[1, 1, 1]} />
-        <meshStandardMaterial color={tintedColor(new THREE.Color('#52525b'), tint)} />
-      </mesh>
-    );
-  }
-
-  return (
-    <Suspense fallback={null}>
-      <Model
-        meshUrl={meshUrl}
-        diffuseUrl={object.CustomMesh?.DiffuseURL}
-        tint={tint}
-      />
-    </Suspense>
-  );
-}
-
-function Model({
-  meshUrl,
-  diffuseUrl,
-  tint,
-}: {
-  meshUrl: string;
-  diffuseUrl?: string;
-  tint: THREE.Color;
-}) {
-  const root = useLoader(FlexibleModelLoader, assetUrl(meshUrl));
-
-  return (
-    <>
-      <primitive object={root} scale={0.5} />
-      {diffuseUrl && <DiffuseTexture root={root} url={diffuseUrl} />}
-      <Tint root={root} tint={tint} />
-    </>
-  );
-}
-
-// Apply the object's tint to every material on the loaded model, multiplying
-// the existing color. Rendered after the model so it runs once the materials
-// exist.
-function Tint({ root, tint }: { root: Object3D; tint: THREE.Color }) {
-  useLayoutEffect(() => {
-    root.traverse((child) => {
-      const mesh = child as THREE.Mesh;
-      if (mesh.isMesh) {
-        const material = Array.isArray(mesh.material)
-          ? mesh.material[0]
-          : mesh.material;
-        if (material && 'color' in material) {
-          (material as THREE.MeshStandardMaterial).color.multiply(tint);
-          material.needsUpdate = true;
-        }
-      }
-    });
-  }, [root, tint]);
-
-  return null;
-}
-
-// Rendered inside the Canvas so `useTexture` can access the R3F store. Only
-// mounted when a diffuse URL exists, so the hook count stays consistent.
-function DiffuseTexture({ root, url }: { root: Object3D; url: string }) {
-  const texture = useTexture(assetUrl(url));
-
-  // Apply the diffuse texture to every mesh material on the loaded model.
-  useLayoutEffect(() => {
-    root.traverse((child) => {
-      const mesh = child as THREE.Mesh;
-      if (mesh.isMesh) {
-        const material = Array.isArray(mesh.material)
-          ? mesh.material[0]
-          : mesh.material;
-        if (material && 'map' in material) {
-          material.map = texture;
-          material.needsUpdate = true;
-        }
-      }
-    });
-  }, [root, texture]);
-
-  return null;
-}
+export { CustomModelMesh } from './CustomModelMesh';

apps/web/src/components/viewers/DeckViewer.tsx

@@ -0,0 +1,400 @@
+import { useMemo, useRef, useState } from 'react';
+import type { RefObject, WheelEvent } from 'react';
+import { useFrame } from '@react-three/fiber';
+import * as THREE from 'three';
+import type { TTSObject } from '@tts/shared';
+import { useBounds } from '@react-three/drei';
+import Scene from './Scene';
+import { CardObjectMesh } from './CardMesh';
+import type { ViewerProps } from '../viewers';
+
+/** How many cards to show to each side of the active card. */
+const HALF_WINDOW = 3;
+/** Angular spacing between adjacent cards in the arc, in radians. */
+const ARC_STEP = 0.32;
+/** Minimum radius of the arc, in world units. */
+const ARC_RADIUS = 3.2;
+/** Extra clearance between the active card's edge and its neighbors, in world units. */
+const ARC_PADDING = 0.2;
+/**
+ * A deck carousel: the deck's contained cards are fanned in a 3D arc with the
+ * active card front and center. Prev/next controls step through the deck, each
+ * card animating to its new slot. Side cards are turned 90° in y (album flow)
+ * so only the active card's face is framed; all neighbors edge-on around it.
+ *
+ * The camera is fitted to just the active card (not the whole carousel): the
+ * shared scene's auto-fit is disabled and `useBounds` refits whenever the
+ * selection changes.
+ *
+ * Only a window of cards around the active one is rendered (the rest stay
+ * hidden), so large decks stay lean. Falls back to a single card (the deck
+ * object itself) when there are no contained cards.
+ */
+export default function DeckViewer({ object, fill }: ViewerProps) {
+  const cards = (object.ContainedObjects ?? []).filter(
+    (o) => o.CardID != null || o.CustomImage != null,
+  );
+  const count = cards.length;
+  const [active, setActive] = useState(0);
+  const hasCards = count > 0;
+  const centerRef = useRef<THREE.Group>(null);
+  // The active card's world-space width, measured once it's laid out. Used to
+  // widen the arc so neighbors clear the card's edges (a fixed radius only fits
+  // square cards; wider cards clip their neighbors).
+  const [cardWidth, setCardWidth] = useState<number | null>(null);
+
+  const step = (dir: number) => setActive((a) => (a + dir + count) % count);
+  const radius = arcRadius(cardWidth);
+
+  const visible = useMemo(
+    () =>
+      cards
+        .map((card, i) => ({ card, i, k: i - active }))
+        .filter((v) => Math.abs(v.k) <= HALF_WINDOW),
+    [cards, active],
+  );
+
+  // The active card always settles to the arc center, so the camera only needs
+  // to frame it once on mount.
+  const didFit = useRef(false);
+
+  return (
+    <Scene
+      fit={false}
+      autoRotate={false}
+      fill={fill}
+      shadow={false}
+      overlay={
+        hasCards ? (
+          <CarouselControls active={active} count={count} onStep={step} />
+        ) : undefined
+      }
+    >
+      {hasCards ? (
+        <>
+          {visible.map(({ card, i, k }) => (
+            // Key by the card's index (stable across renders) so the element
+            // persists and tweens as its slot changes; the index-path key is
+            // unique even though cards in a deck share the same GUID.
+            <CarouselCard
+              key={i}
+              card={card}
+              k={k}
+              radius={radius}
+              groupRef={k === 0 ? centerRef : undefined}
+            />
+          ))}
+          <FitActive
+            targetRef={centerRef}
+            didFit={didFit}
+            onMeasure={setCardWidth}
+          />
+        </>
+      ) : (
+        // No contained cards: show the deck object itself, laid flat so the
+        // shared scene's contact shadow has a surface to project onto.
+        <group rotation={[-Math.PI / 2, 0, 0]}>
+          <CardObjectMesh object={object} />
+        </group>
+      )}
+    </Scene>
+  );
+}
+
+/**
+ * Fits the camera once, on the first frame, to frame the active card from the
+ * front. Runs in a frame callback (not an effect) so the active card has been
+ * moved to its arc slot by its own `useFrame` first — otherwise the group is
+ * still at the origin and the camera would frame the carousel center.
+ *
+ * The card's front face points toward +Z, so the camera is placed directly in
+ * front of it and looks straight at it, rather than keeping its initial side
+ * angle (which drei's `fit()` would do). The active card always settles in the
+ * same slot, so no refit is needed while navigating — that would restart the
+ * camera tween on every step and feel laggy.
+ */
+function FitActive({
+  targetRef,
+  didFit,
+  onMeasure,
+}: {
+  targetRef: RefObject<THREE.Group | null>;
+  didFit: RefObject<boolean>;
+  onMeasure: (width: number) => void;
+}) {
+  const bounds = useBounds();
+  // Whether the active card's width has been measured once. The fit waits one
+  // frame after measuring so the arc radius (and thus the active card's slot)
+  // has settled before framing it.
+  const measured = useRef(false);
+
+  useFrame(() => {
+    const node = targetRef.current;
+    if (!node) return;
+    // Stop refreshing once fit: drei's `bounds.refresh()` resets the camera
+    // goal, so calling it every frame would wipe the fit we just set before
+    // the camera tween ever runs.
+    if (didFit.current) return;
+    bounds.refresh(node);
+    const { size, center, distance } = bounds.getSize();
+    // Report the active card's width so the arc radius can widen for wide
+    // cards (see `arcRadius`).
+    onMeasure(size.x);
+    if (!measured.current) {
+      measured.current = true;
+      return;
+    }
+    didFit.current = true;
+    // The card's front face points toward +Z, so put the camera in front of it
+    // and look straight at it.
+    bounds
+      .moveTo([center.x, center.y, center.z + distance])
+      .lookAt({ target: center });
+  });
+
+  return null;
+}
+
+/** A single card that tweens into its arc slot each frame. */
+function CarouselCard({
+  card,
+  k,
+  radius,
+  groupRef,
+}: {
+  card: TTSObject;
+  k: number;
+  radius: number;
+  groupRef?: RefObject<THREE.Group | null>;
+}) {
+  const localRef = useRef<THREE.Group>(null);
+  const group = groupRef ?? localRef;
+  // Start at the target so the first render doesn't tween into place.
+  const state = useRef(slotTransform(k, radius));
+  const target = useMemo(() => slotTransform(k, radius), [k, radius]);
+
+  useFrame((_, dt) => {
+    const g = group.current;
+    if (!g) return;
+    // Smooth per-frame damping independent of frame rate.
+    const f = 1 - Math.pow(0.0001, dt);
+    const t = target;
+    const s = state.current;
+    s.x += (t.x - s.x) * f;
+    s.z += (t.z - s.z) * f;
+    s.rot += (t.rot - s.rot) * f;
+    s.scale += (t.scale - s.scale) * f;
+    g.position.set(s.x, 0, s.z);
+    g.rotation.y = s.rot;
+    g.scale.setScalar(s.scale);
+  });
+
+  return (
+    <group ref={group}>
+      <CardObjectMesh object={card} />
+      {/* A soft radial shadow under this card; it inherits the card group's
+          position/rotation/scale, so it tweens with the card. Card meshes are
+          laid flat (face up), so the plane sits just below the card's bottom. */}
+      <CardShadow />
+    </group>
+  );
+}
+
+// A soft elliptical drop shadow under a single carousel card. The card mesh is
+// ~2 world-units tall (centered), so its bottom sits at local y = -1; we put a
+// radial-gradient plane just below it. I can't use `ContactShadows` here
+// because the card is a thin vertical panel — a top-down capture would only
+// catch a line. Instead we fake a soft ambient contact shadow with a gradient.
+const CARD_HALF_HEIGHT = 1;
+const SHADOW_SCALE = 2.6;
+
+function CardShadow() {
+  // A soft radial gradient, dark at the center fading to transparent — reads as
+  // a soft blob of shadow rather than a hard cast shadow.
+  const texture = useMemo(makeSoftShadowTexture, []);
+  return (
+    <mesh
+      position={[0, -CARD_HALF_HEIGHT, 0]}
+      rotation={[-Math.PI / 2, 0, 0]}
+      scale={[SHADOW_SCALE, SHADOW_SCALE, 1]}
+    >
+      <planeGeometry args={[1, 1]} />
+      <meshBasicMaterial map={texture} transparent depthWrite={false} />
+    </mesh>
+  );
+}
+
+/** Build a radial-gradient texture: dark center fading out to transparent. */
+function makeSoftShadowTexture(): THREE.Texture {
+  const size = 256;
+  const canvas = document.createElement('canvas');
+  canvas.width = canvas.height = size;
+  const ctx = canvas.getContext('2d');
+  if (!ctx) return new THREE.Texture();
+  const g = ctx.createRadialGradient(
+    size / 2,
+    size / 2,
+    0,
+    size / 2,
+    size / 2,
+    size / 2,
+  );
+  const stops: [number, number][] = [
+    [0, 0.55],
+    [0.45, 0.35],
+    [0.75, 0.12],
+    [1, 0],
+  ];
+  for (const [t, a] of stops) {
+    g.addColorStop(t, `rgba(0, 0, 0, ${a})`);
+  }
+  ctx.fillStyle = g;
+  ctx.fillRect(0, 0, size, size);
+  const texture = new THREE.CanvasTexture(canvas);
+  texture.needsUpdate = true;
+  return texture;
+}
+
+interface Slots {
+  x: number;
+  z: number;
+  rot: number;
+  scale: number;
+}
+
+/** World transform for a card at arc offset `k` (0 = front and center). */
+function slotTransform(k: number, radius: number): Slots {
+  const ang = k * ARC_STEP;
+  // Side cards turn edge-on (album flow); the active card stays forward.
+  const turn = k === 0 ? 0 : Math.sign(k) * (Math.PI / 2);
+  return {
+    x: Math.sin(ang) * radius,
+    z: Math.cos(ang) * radius,
+    rot: turn,
+    scale: 1.15 - 0.15 * Math.abs(k),
+  };
+}
+
+/**
+ * Arc radius that keeps the nearest neighbors clear of the active card's
+ * edges. A neighbor at `k = 1` sits at `x = sin(ARC_STEP) * radius`, so the
+ * radius must exceed `cardWidth / 2 / sin(ARC_STEP)` for the neighbor to clear
+ * the card's half-width (plus padding). Falls back to the minimum when the
+ * card width isn't known yet.
+ */
+function arcRadius(cardWidth: number | null): number {
+  if (cardWidth == null) return ARC_RADIUS;
+  return Math.max(ARC_RADIUS, (cardWidth / 2 + ARC_PADDING) / Math.sin(ARC_STEP));
+}
+
+/**
+ * Prev/next controls and a sliding-dot pagination, rendered as the scene
+ * overlay. All dots live in a fixed-width track that slides so the active dot
+ * stays centered; dots fade out as they leave the window. A counter above the
+ * bar shows the current index (`1 / 51`). Round first/last and prev/next
+ * buttons flank the dots. Scrolling over the pagination steps through the
+ * deck.
+ */
+function CarouselControls({
+  active,
+  count,
+  onStep,
+}: {
+  active: number;
+  count: number;
+  onStep: (dir: number) => void;
+}) {
+  const prev = () => onStep(-1);
+  const next = () => onStep(1);
+  const first = () => onStep(-active);
+  const last = () => onStep(count - 1 - active);
+
+  // Dots visible on each side of the active dot.
+  const DOT_WINDOW = 4;
+  const DOT_SIZE = 8;
+  const ACTIVE_WIDTH = 26;
+  const GAP = 6;
+  const SLOTS = DOT_WINDOW * 2 + 1;
+  const slotW = DOT_SIZE + GAP;
+  // Extra width the active dot (plus its gap) pushes beyond a normal slot.
+  const extra = ACTIVE_WIDTH + GAP - slotW;
+  const trackW = SLOTS * slotW + extra;
+  // Left offset of a dot at slot `s` (0 = leftmost). Dots after the active
+  // slot shift right by `extra` to make room for the wider active dot.
+  const slotLeft = (s: number) => s * slotW + (s > DOT_WINDOW ? extra : 0);
+  const dots = Array.from({ length: count }, (_, i) => i);
+
+  const onWheel = (e: React.WheelEvent) => {
+    // Scroll up/left goes back, scroll down/right goes forward.
+    onStep(e.deltaY < 0 ? -1 : 1);
+  };
+
+  const roundBtn =
+    'flex h-8 w-8 items-center justify-center rounded-full border border-zinc-700 bg-zinc-900/80 text-zinc-300 backdrop-blur transition hover:bg-zinc-800 hover:text-zinc-100 disabled:opacity-40 disabled:hover:bg-zinc-900/80 disabled:hover:text-zinc-300';
+
+  return (
+    <div className="absolute inset-x-0 bottom-2 z-10 flex flex-col items-center gap-2">
+      <span className="rounded-md bg-zinc-900/80 px-2 py-0.5 font-mono text-xs text-zinc-300 backdrop-blur">
+        {active + 1} / {count}
+      </span>
+      <div className="flex items-center gap-2">
+        <button
+          onClick={first}
+          disabled={active === 0}
+          aria-label="First card"
+          className={roundBtn}
+        >
+          «
+        </button>
+        <button onClick={prev} aria-label="Previous card" className={roundBtn}>
+          ‹
+        </button>
+        <div
+          onWheel={onWheel}
+          role="group"
+          aria-label="Browse cards"
+          className="flex items-center rounded-full bg-zinc-900/80 px-2 py-1.5 backdrop-blur"
+        >
+          <div
+            className="relative overflow-hidden"
+            style={{ width: trackW, height: DOT_SIZE }}
+          >
+            {dots.map((i) => {
+              const isActive = i === active;
+              const slot = DOT_WINDOW + (i - active);
+              const inWindow = slot >= 0 && slot < SLOTS;
+              return (
+                <button
+                  key={i}
+                  onClick={() => onStep(i - active)}
+                  aria-label={`Go to card ${i + 1}`}
+                  aria-current={isActive ? 'true' : undefined}
+                  className="absolute top-0 flex items-center justify-center rounded-full transition-all duration-300"
+                  style={{
+                    left: slotLeft(slot),
+                    width: isActive ? ACTIVE_WIDTH : DOT_SIZE,
+                    height: DOT_SIZE,
+                    opacity: inWindow ? 1 : 0,
+                    pointerEvents: inWindow ? 'auto' : 'none',
+                    backgroundColor: isActive ? '#f4f4f5' : '#71717a',
+                  }}
+                />
+              );
+            })}
+          </div>
+        </div>
+        <button onClick={next} aria-label="Next card" className={roundBtn}>
+          ›
+        </button>
+        <button
+          onClick={last}
+          disabled={active === count - 1}
+          aria-label="Last card"
+          className={roundBtn}
+        >
+          »
+        </button>
+      </div>
+    </div>
+  );
+}

apps/web/src/components/viewers/PdfViewer.tsx

@@ -0,0 +1,43 @@
+import type { TTSObject } from '@tts/shared';
+import { pdfUrl } from '@tts/http';
+
+/**
+ * A PDF document (`Custom_PDF`). Renders the document inline in an iframe and
+ * offers a standalone link to open it in a new tab. The URL is routed through
+ * the proxy `/pdf` endpoint, which forces `Content-Disposition: inline` so the
+ * browser displays the PDF instead of downloading it.
+ */
+export default function PdfViewer({ object }: { object: TTSObject }) {
+  const url = object.CustomPDF?.PDFUrl;
+
+  if (!url) {
+    return (
+      <p className="text-sm text-zinc-500">
+        This object has no PDF URL.
+      </p>
+    );
+  }
+
+  const proxied = pdfUrl(url);
+
+  return (
+    <div className="flex h-full min-h-0 flex-col gap-3">
+      <div className="flex items-center justify-between gap-2">
+        <p className="truncate font-mono text-xs text-zinc-500">{url}</p>
+        <a
+          href={proxied}
+          target="_blank"
+          rel="noreferrer"
+          className="shrink-0 rounded-lg bg-zinc-100 px-3 py-1.5 text-sm font-medium text-zinc-900 hover:bg-zinc-300"
+        >
+          Open PDF in new tab
+        </a>
+      </div>
+      <iframe
+        src={proxied}
+        title="PDF preview"
+        className="min-h-0 w-full flex-1 rounded-lg border border-zinc-800 bg-zinc-950"
+      />
+    </div>
+  );
+}

apps/web/src/components/viewers/Scene.tsx

@@ -1,7 +1,10 @@
-import { Suspense, type ReactNode } from 'react';
-import { Canvas } from '@react-three/fiber';
-import { Bounds, ContactShadows, OrbitControls, useProgress } from '@react-three/drei';
-import { Bloom, EffectComposer, Vignette } from '@react-three/postprocessing';
+import { Suspense, useEffect, useRef, useState, type RefObject, type ReactNode } from 'react';
+import { Icon } from '@iconify/react';
+import { Canvas, useFrame } from '@react-three/fiber';
+import { Bounds, ContactShadows, Environment, Lightformer, OrbitControls, useProgress } from '@react-three/drei';
+import { BrightnessContrast, EffectComposer, ToneMapping, Vignette } from '@react-three/postprocessing';
+import { ToneMappingMode } from 'postprocessing';
+import * as THREE from 'three';
 
 /**
  * Shared 3D scene wrapper for object viewers. Provides a consistent camera,
@@ -12,43 +15,126 @@ import { Bloom, EffectComposer, Vignette } from '@react-three/postprocessing';
  * The camera is fitted to the bounds of the content on mount. `Bounds` sits
  * inside the Suspense boundary, so it only mounts once the (suspending) content
  * has loaded and its geometry is present.
+ *
+ * `autoRotate` and `enablePan` tune the orbit controls (a tabletop view, for
+ * example, pans instead of rotating). `fullscreen` adds a toggle button that
+ * `maxPolarAngle` (radians) clamps how
+ * far the camera can tilt below the horizon, e.g. to stop a tabletop view from
+ * peeking under face-down cards.
+ *
+ * `fit` (default true) bounds, fits, and clips the camera to the scene's
+ * content on mount and resize. A viewer that needs to frame a specific part of
+ * its content (e.g. the active card in a deck carousel) can set it to false and
+ * call `useBounds()` itself to refit.
+ *
+ * By default the scene renders in an `aspect-[3/4]` frame; set `fill` to expand
+ * to the full height of its container (used by the inspector view).
  */
-export default function Scene({ children }: { children: ReactNode }) {
+export default function Scene({
+  children,
+  autoRotate = true,
+  enablePan = false,
+  fullscreen = false,
+  fit = true,
+  fill = false,
+  overlay,
+  shadowScale = 22,
+  maxPolarAngle = Math.PI,
+  shadowBlur = 0.012,
+  shadow = true,
+}: {
+  children: ReactNode;
+  autoRotate?: boolean;
+  enablePan?: boolean;
+  fullscreen?: boolean;
+  /** Whether the shared scene fits + clips its children with `Bounds` (default true). */
+  fit?: boolean;
+  /** Expand to fill the container height instead of the default aspect-[3/4] frame. */
+  fill?: boolean;
+  /** HTML rendered inside the scene container (e.g. controls), shown in fullscreen. */
+  overlay?: ReactNode;
+  /** Contact shadow plane size in world units; defaults to a generous 22. */
+  shadowScale?: number;
+  /** Contact shadow blur as a fraction of the plane size; a larger value is softer. */
+  shadowBlur?: number;
+  /** Whether to render a scene-level contact shadow under the content (default true). */
+  shadow?: boolean;
+  /** Max camera polar angle in radians; defaults to unrestricted (π). */
+  maxPolarAngle?: number;
+}) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const [isFullscreen, setIsFullscreen] = useState(false);
+  // Points at the wrapped children so the shadow can measure the real content
+  // bounding box (independent of drei's `Bounds` camera fit).
+  const contentRef = useRef<THREE.Group>(null);
+
+  useEffect(() => {
+    const onChange = () => setIsFullscreen(!!document.fullscreenElement);
+    document.addEventListener('fullscreenchange', onChange);
+    return () => document.removeEventListener('fullscreenchange', onChange);
+  }, []);
+
+  const toggleFullscreen = () => {
+    if (document.fullscreenElement) void document.exitFullscreen();
+    else void containerRef.current?.requestFullscreen();
+  };
+
   return (
-    <div className="relative h-80 w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-900 to-zinc-950">
+    <div
+      ref={containerRef}
+      className={`relative w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-300 to-zinc-400 ${
+        fill ? 'h-full min-h-0' : 'aspect-3/4'
+      }`}
+    >
       <LoadingOverlay />
+      {fullscreen && (
+        <button
+          onClick={toggleFullscreen}
+          title={isFullscreen ? 'Exit fullscreen' : 'Fullscreen'}
+          aria-label={isFullscreen ? 'Exit fullscreen' : 'Fullscreen'}
+          className="absolute right-2 top-2 z-10 flex h-8 w-8 items-center justify-center rounded-md border border-zinc-700 bg-zinc-900/80 text-zinc-300 backdrop-blur transition hover:bg-zinc-800 hover:text-zinc-100"
+        >
+          <Icon icon={isFullscreen ? 'mdi:fullscreen-exit' : 'mdi:fullscreen'} className="h-5 w-5" />
+        </button>
+      )}
+      {overlay}
       <Canvas
         camera={{ position: [2.2, 1.8, 2.6], fov: 40 }}
         dpr={[1, 2]}
-        gl={{ antialias: true }}
+        gl={{ antialias: true, alpha: true }}
       >
-        <ambientLight intensity={0.5} />
-        <directionalLight position={[4, 6, 3]} intensity={1.4} />
-        <directionalLight position={[-4, 2, -3]} intensity={0.4} color="#b3c7ff" />
-        <pointLight position={[0, 3, 0]} intensity={0.3} />
+        <ambientLight intensity={0.1} />
+
+        <Environment resolution={256}>
+          <Lightformer intensity={.5} position={[0, 5, 0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[0, 0, 5]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[0, 0, -5]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[-5, 0, 0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={.5} position={[5, 0, -0]} scale={[10, 10, 1]} />
+          <Lightformer intensity={0.6} color="#fff1d6" position={[0, -3, 0]} scale={[6, 6, 1]} />
+        </Environment>
+
+        {shadow && (
+          <AdaptiveContactShadow shadowScale={shadowScale} shadowBlur={shadowBlur} contentRef={contentRef} />
+        )}
 
         <Suspense fallback={null}>
-          <Bounds fit observe clip>{children}</Bounds>
+          <Bounds fit={fit} observe={fit} clip={fit}>
+            <group ref={contentRef}>{children}</group>
+          </Bounds>
         </Suspense>
-
-        <ContactShadows
-          position={[0, -0.5, 0]}
-          opacity={0.55}
-          scale={8}
-          blur={2.4}
-          far={3}
-          resolution={256}
-        />
         <OrbitControls
-          enablePan={false}
+          enablePan={enablePan}
           minDistance={0.01}
           maxDistance={8}
-          autoRotate
+          maxPolarAngle={maxPolarAngle}
+          autoRotate={autoRotate}
           makeDefault
         />
 
         <EffectComposer>
-          <Bloom intensity={0.25} luminanceThreshold={0.85} mipmapBlur />
+          <ToneMapping mode={ToneMappingMode.AGX} />
+          <BrightnessContrast brightness={0.12} contrast={.5} />
           <Vignette eskil={false} offset={0.25} darkness={0.6} />
         </EffectComposer>
       </Canvas>
@@ -76,3 +162,84 @@ function LoadingOverlay() {
     </div>
   );
 }
+
+/**
+ * A contact shadow sized and placed to the scene's actual content bounds.
+ *
+ * A fixed-size shadow plane baked for a 2-unit token is invisible to a whole
+ * card or model ten times larger, so the plane is (re)sized to the bounding
+ * box of whatever is wrapped in the scene, measured each frame from a ref.
+ * Keeping it scene-level (instead of per mesh) keeps it world-horizontal at
+ * the table and costs one shadow render per frame even when there are many
+ * meshes, which per-mesh planes would multiply.
+ *
+ * The plane sits on the very bottom (y minimum) of the content, centered on
+ * its footprint, and spans a bit wider so the shadow edge doesn't fall inside
+ * the object. `far` covers the full content height so tall objects aren't
+ * clipped. Falls back to `shadowScale` while the bounds are still empty.
+ */
+function AdaptiveContactShadow({
+  shadowScale,
+  shadowBlur,
+  contentRef,
+}: {
+  shadowScale: number;
+  shadowBlur: number;
+  contentRef: RefObject<THREE.Group | null>;
+}) {
+  // Current computed shadow config, kept in a ref so it's stable between frames
+  // and only recomputed when the content bounds actually change.
+  const state = useRef({ scale: 0, posX: 0, posY: 0, posZ: 0, far: 0 });
+  // Scratch box, reused each frame to avoid allocations.
+  const box = useRef(new THREE.Box3()).current;
+
+  useFrame(() => {
+    const content = contentRef.current;
+    if (!content) return;
+    content.updateWorldMatrix(true, true);
+    box.setFromObject(content);
+    if (box.isEmpty()) return;
+
+    const size = box.getSize(new THREE.Vector3());
+    const center = box.getCenter(new THREE.Vector3());
+    // The shadow plane rests on the very bottom of the content, centered on its
+    // footprint. `far` covers the full content height (plus margin) so the
+    // capture doesn't clip tall objects; `scale` covers the footprint.
+    const scale = Math.max(size.x, size.z) * SHADOW_PAD;
+    const posY = box.min.y;
+    const far = size.y + SHADOW_HEIGHT_MARGIN;
+    const s = state.current;
+    if (
+      scale !== s.scale ||
+      center.x !== s.posX ||
+      posY !== s.posY ||
+      center.z !== s.posZ ||
+      far !== s.far
+    ) {
+      Object.assign(s, { scale, posX: center.x, posY, posZ: center.z, far });
+    }
+  });
+
+  const s = state.current;
+  const scale = s.scale || shadowScale;
+  // Sit just below the lowest point of the content so it rests on it without
+  // intersecting; the plane uses a (fixed) world-horizontal orientation.
+  const position = [s.posX, s.posY - 0.01, s.posZ] as [number, number, number];
+
+  return (
+    <ContactShadows
+      position={position}
+      opacity={0.2}
+      scale={scale}
+      blur={scale * shadowBlur}
+      far={s.far || scale * 0.01}
+      resolution={1024}
+      color="#000000"
+    />
+  );
+}
+
+/** How far the shadow plane extends past the content footprint, as a multiple. */
+const SHADOW_PAD = 1.1;
+/** Extra capture depth beyond the content height, so the falloff edge isn't clipped. */
+const SHADOW_HEIGHT_MARGIN = 0.5;

apps/web/src/components/viewers/TileMesh.tsx

@@ -0,0 +1,159 @@
+import { useTexture } from '@react-three/drei';
+import { useMemo } from 'react';
+import * as THREE from 'three';
+import type { TTSObject } from '@tts/shared';
+import {
+  circleShape,
+  extrudeShapeParts,
+  hexShape,
+  rectShape,
+  roundedRectShape,
+  scaleShape,
+  type ExtrudedGeometry,
+} from '@tts/mesh';
+import { assetUrl } from '@tts/http';
+import { flipTexture } from './flipTexture';
+import {
+  getSharedGeometry,
+  getSharedMaterial,
+  objectTint,
+  tintKey,
+  tintedColor,
+} from './sharedResources';
+
+/** `CustomTile.Type` enum from Tabletop Simulator. */
+const TileType = {
+  Box: 0,
+  Hex: 1,
+  Circle: 2,
+  Rounded: 3,
+} as const;
+
+const TILE_SIZE = 2;
+
+/**
+ * The tile mesh for an object, exported so the full-setup view can compose it
+ * into a shared scene.
+ */
+export function TileObjectMesh({ object }: { object: TTSObject }) {
+  const url = object.CustomImage?.ImageURL ?? object.CustomImage?.ImageSecondaryURL;
+  const thickness = object.CustomImage?.CustomTile?.Thickness ?? 0.2;
+  const type = object.CustomImage?.CustomTile?.Type ?? TileType.Box;
+  const stretch = object.CustomImage?.CustomTile?.Stretch ?? true;
+
+  return (
+    <TileMesh
+      url={url}
+      thickness={thickness}
+      type={type}
+      stretch={stretch}
+      tint={objectTint(object)}
+    />
+  );
+}
+
+// Rendered inside the Canvas so `useTexture` can access the R3F store.
+// Exported so the full-setup view can compose it into a shared scene.
+export function TileMesh({
+  url,
+  thickness,
+  type,
+  stretch,
+  tint,
+}: {
+  url?: string;
+  thickness: number;
+  type: number;
+  stretch: boolean;
+  tint: THREE.Color;
+}) {
+  const texture: THREE.Texture | null = url ? useTexture(assetUrl(url)) : null;
+
+  // Tile art is sRGB-encoded; `TextureLoader` leaves `colorSpace` as
+  // `NoColorSpace`, which double-decodes it in the shader and washes out
+  // contrast. Mark it sRGB so the GPU decodes it once, correctly.
+  if (texture) texture.colorSpace = THREE.SRGBColorSpace;
+
+  // Build the extruded geometry from the tile shape. When `stretch` is false
+  // and a texture is available, scale the shape to the image's aspect ratio so
+  // the tile matches the source proportions instead of being square. Shared
+  // across tiles with the same shape so the full-setup view reuses geometry.
+  const { front, back, walls } = useMemo(() => {
+    const img = texture?.image as HTMLImageElement;
+    const aspect = stretch ? img.width / img.height : 1;
+    const shape = tileShape(type, aspect);
+    const parts = extrudeShapeParts(shape, { height: thickness });
+    const key = `tile:${type}:${aspect}:${thickness}`;
+    return {
+      front: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
+      back: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
+      walls: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
+    };
+  }, [type, thickness, stretch, texture]);
+
+  // The back face maps with the same planar UVs as the front, so flip it
+  // left/right to avoid a mirrored texture when viewed from behind.
+  const backMap = useMemo(() => (texture ? flipTexture(texture) : null), [texture]);
+
+  // Shared materials: the front/back carry the tile texture (or a neutral
+  // color when absent); the walls are a solid white, matching TTS tinting.
+  // The tint is baked into the color and the cache key so tinted variants
+  // don't collide.
+  const tintK = tintKey(tint);
+  const faceKey = `tile-face:${url ?? 'none'}:${tintK}`;
+  const faceMat = getSharedMaterial(faceKey, {
+    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
+    map: texture ?? undefined,
+    roughness: 0.8,
+  });
+  const backMat = getSharedMaterial(faceKey + ':back', {
+    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
+    map: backMap ?? undefined,
+    roughness: 0.8,
+  });
+  const wallMat = getSharedMaterial(`tile-wall:${tintK}`, {
+    color: tintedColor(new THREE.Color('#ffffff'), tint),
+    roughness: 0.8,
+  });
+
+  return (
+    <group>
+      {/* Front face carries the tile texture. */}
+      <mesh geometry={front} material={faceMat} />
+      {/* Back face, flipped so it isn't mirrored. */}
+      <mesh geometry={back} material={backMat} />
+      {/* Sides are a solid white, matching TTS tile tinting. */}
+      <mesh geometry={walls} material={wallMat} />
+    </group>
+  );
+}
+
+/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
+function toGeometry(extruded: ExtrudedGeometry) {
+  const { positions, normals, uvs, indices } = extruded;
+  const geo = new THREE.BufferGeometry();
+  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
+  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
+  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
+  geo.setIndex(new THREE.BufferAttribute(indices, 1));
+  return geo;
+}
+
+/** Build the 2D footprint for a tile type, scaled to a target aspect ratio. */
+function tileShape(type: number, aspect: number) {
+  // Base shape is square (1x1); scale x to the aspect ratio so the tile is
+  // `aspect` wide and 1 tall (or keep 1x1 when the aspect is 1).
+  const sx = aspect;
+  const sy = 1;
+  switch (type) {
+    case TileType.Hex:
+      return scaleShape(hexShape(TILE_SIZE / 2), sx, sy);
+    case TileType.Circle:
+      return scaleShape(circleShape(TILE_SIZE / 2), sx, sy);
+    case TileType.Rounded:
+      return scaleShape(roundedRectShape(TILE_SIZE, TILE_SIZE, 0.08), sx, sy);
+    case TileType.Box:
+    default:
+      return scaleShape(rectShape(TILE_SIZE, TILE_SIZE), sx, sy);
+  }
+}

apps/web/src/components/viewers/TileViewer.tsx

@@ -1,36 +1,7 @@
-import { useTexture } from '@react-three/drei';
-import { useMemo } from 'react';
-import * as THREE from 'three';
 import type { TTSObject } from '@tts/shared';
-import {
-  circleShape,
-  extrudeShapeParts,
-  hexShape,
-  rectShape,
-  roundedRectShape,
-  scaleShape,
-  type ExtrudedGeometry,
-} from '@tts/mesh';
 import Scene from './Scene';
-import { assetUrl } from './assetUrl';
-import { flipTexture } from './flipTexture';
-import {
-  getSharedGeometry,
-  getSharedMaterial,
-  objectTint,
-  tintKey,
-  tintedColor,
-} from './sharedResources';
-
-/** `CustomTile.Type` enum from Tabletop Simulator. */
-const TileType = {
-  Box: 0,
-  Hex: 1,
-  Circle: 2,
-  Rounded: 3,
-} as const;
-
-const TILE_SIZE = 2;
+import { TileObjectMesh } from './TileMesh';
+import type { ViewerProps } from '../viewers';
 
 /**
  * A flat tile with a texture on its top face. Uses `CustomImage.ImageURL`
@@ -40,132 +11,15 @@ const TILE_SIZE = 2;
  * When `CustomTile.Stretch` is false, the tile's aspect ratio follows the
  * source image instead of being forced square.
  */
-export default function TileViewer({ object }: { object: TTSObject }) {
+export default function TileViewer({ object, fill }: ViewerProps) {
   return (
-    <Scene>
-      <TileObjectMesh object={object} />
+    <Scene fill={fill}>
+      {/* Lay the tile flat on the ground (the mesh is authored standing). */}
+      <group rotation={[-Math.PI / 2, 0, 0]}>
+        <TileObjectMesh object={object} />
+      </group>
     </Scene>
   );
 }
 
-/**
- * The tile mesh for an object, exported so the full-setup view can compose it
- * into a shared scene.
- */
-export function TileObjectMesh({ object }: { object: TTSObject }) {
-  const url = object.CustomImage?.ImageURL ?? object.CustomImage?.ImageSecondaryURL;
-  const thickness = object.CustomImage?.CustomTile?.Thickness ?? 0.2;
-  const type = object.CustomImage?.CustomTile?.Type ?? TileType.Box;
-  const stretch = object.CustomImage?.CustomTile?.Stretch ?? true;
-
-  return (
-    <TileMesh
-      url={url}
-      thickness={thickness}
-      type={type}
-      stretch={stretch}
-      tint={objectTint(object)}
-    />
-  );
-}
-
-// Rendered inside the Canvas so `useTexture` can access the R3F store.
-// Exported so the full-setup view can compose it into a shared scene.
-export function TileMesh({
-  url,
-  thickness,
-  type,
-  stretch,
-  tint,
-}: {
-  url?: string;
-  thickness: number;
-  type: number;
-  stretch: boolean;
-  tint: THREE.Color;
-}) {
-  const texture: THREE.Texture | null = url ? useTexture(assetUrl(url)) : null;
-
-  // Build the extruded geometry from the tile shape. When `stretch` is false
-  // and a texture is available, scale the shape to the image's aspect ratio so
-  // the tile matches the source proportions instead of being square. Shared
-  // across tiles with the same shape so the full-setup view reuses geometry.
-  const { front, back, walls } = useMemo(() => {
-    const img = texture?.image as HTMLImageElement;
-    const aspect = stretch ? img.width / img.height : 1;
-    const shape = tileShape(type, aspect);
-    const parts = extrudeShapeParts(shape, { height: thickness });
-    const key = `tile:${type}:${aspect}:${thickness}`;
-    return {
-      front: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
-      back: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
-      walls: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
-    };
-  }, [type, thickness, stretch, texture]);
-
-  // The back face maps with the same planar UVs as the front, so flip it
-  // left/right to avoid a mirrored texture when viewed from behind.
-  const backMap = useMemo(() => (texture ? flipTexture(texture) : null), [texture]);
-
-  // Shared materials: the front/back carry the tile texture (or a neutral
-  // color when absent); the walls are a solid white, matching TTS tinting.
-  // The tint is baked into the color and the cache key so tinted variants
-  // don't collide.
-  const tintK = tintKey(tint);
-  const faceKey = `tile-face:${url ?? 'none'}:${tintK}`;
-  const faceMat = getSharedMaterial(faceKey, {
-    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
-    map: texture ?? undefined,
-    roughness: 0.8,
-  });
-  const backMat = getSharedMaterial(faceKey + ':back', {
-    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
-    map: backMap ?? undefined,
-    roughness: 0.8,
-  });
-  const wallMat = getSharedMaterial(`tile-wall:${tintK}`, {
-    color: tintedColor(new THREE.Color('#ffffff'), tint),
-    roughness: 0.8,
-  });
-
-  return (
-    <group>
-      {/* Front face carries the tile texture. */}
-      <mesh geometry={front} material={faceMat} />
-      {/* Back face, flipped so it isn't mirrored. */}
-      <mesh geometry={back} material={backMat} />
-      {/* Sides are a solid white, matching TTS tile tinting. */}
-      <mesh geometry={walls} material={wallMat} />
-    </group>
-  );
-}
-
-/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
-function toGeometry(extruded: ExtrudedGeometry) {
-  const { positions, normals, uvs, indices } = extruded;
-  const geo = new THREE.BufferGeometry();
-  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
-  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
-  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
-  geo.setIndex(new THREE.BufferAttribute(indices, 1));
-  return geo;
-}
-
-/** Build the 2D footprint for a tile type, scaled to a target aspect ratio. */
-function tileShape(type: number, aspect: number) {
-  // Base shape is square (1x1); scale x to the aspect ratio so the tile is
-  // `aspect` wide and 1 tall (or keep 1x1 when the aspect is 1).
-  const sx = aspect;
-  const sy = 1;
-  switch (type) {
-    case TileType.Hex:
-      return scaleShape(hexShape(TILE_SIZE / 2), sx, sy);
-    case TileType.Circle:
-      return scaleShape(circleShape(TILE_SIZE / 2), sx, sy);
-    case TileType.Rounded:
-      return scaleShape(roundedRectShape(TILE_SIZE, TILE_SIZE, 0.08), sx, sy);
-    case TileType.Box:
-    default:
-      return scaleShape(rectShape(TILE_SIZE, TILE_SIZE), sx, sy);
-  }
-}
+export { TileObjectMesh, TileMesh } from './TileMesh';

apps/web/src/components/viewers/TokenMesh.tsx

@@ -0,0 +1,148 @@
+import { useTexture } from '@react-three/drei';
+import { useMemo } from 'react';
+import * as THREE from 'three';
+import type { TTSObject } from '@tts/shared';
+import {
+  circleShape,
+  extrudeShapeParts,
+  traceToShape,
+  traceToUvBounds,
+  type ExtrudedGeometry,
+} from '@tts/mesh';
+import { traceImage } from '@tts/http';
+import { assetUrl } from '@tts/http';
+import {
+  getSharedGeometry,
+  getSharedMaterial,
+  objectTint,
+  tintKey,
+  tintedColor,
+} from './sharedResources';
+
+const TOKEN_SIZE = 1.8;
+
+/** How far (in trace pixels) the token silhouette is inset from the artwork. */
+const TRACE_INSET = 2;
+
+/**
+ * The token mesh for an object, exported so the full-setup view can compose it
+ * into a shared scene.
+ */
+export function TokenObjectMesh({ object }: { object: TTSObject }) {
+  const url = object.CustomImage?.ImageURL ?? object.CustomImage?.ImageSecondaryURL;
+  const thickness = object.CustomImage?.CustomToken?.Thickness ?? 0.1;
+
+  return <TokenMesh url={url} thickness={thickness} tint={objectTint(object)} />;
+}
+
+// Rendered inside the Canvas so `useTexture` can access the R3F store.
+// Exported so the full-setup view can compose it into a shared scene.
+export function TokenMesh({
+  url,
+  thickness,
+  tint,
+}: {
+  url?: string;
+  thickness: number;
+  tint: THREE.Color;
+}) {
+  const texture: THREE.Texture | null = url ? useTexture(assetUrl(url)) : null;
+
+  // Token art is sRGB-encoded; `TextureLoader` leaves `colorSpace` as
+  // `NoColorSpace`, which double-decodes it in the shader and washes out
+  // contrast. Mark it sRGB so the GPU decodes it once, correctly.
+  if (texture) texture.colorSpace = THREE.SRGBColorSpace;
+
+  // Trace the image's alpha channel into a shape. Suspends until the trace
+  // resolves so the surrounding Suspense boundary (and `Bounds`) only mounts
+  // once the token geometry is present. Falls back to a circle when there's no
+  // image or the trace fails.
+  const trace = useTrace(url);
+
+  const { front, back, walls } = useMemo(() => {
+    // The traced shape and its UV framing share the same transform, so the
+    // full image rectangle maps to the same bounds in mesh coordinates.
+    const scale = TOKEN_SIZE / Math.max(trace?.width ?? 0, trace?.height ?? 0);
+    const shape = trace ? traceToShape(trace, scale) : circleShape(TOKEN_SIZE / 2);
+    const uvBounds = trace ? traceToUvBounds(trace, scale) : undefined;
+    const parts = extrudeShapeParts(shape, { height: thickness, uvBounds });
+    // Shared across tokens with the same source image (the trace is cached per
+    // URL, so the silhouette is deterministic) so the full-setup view reuses
+    // geometry.
+    const key = `token:${url ?? 'none'}:${thickness}`;
+    return {
+      front: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
+      back: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
+      walls: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
+    };
+  }, [trace, thickness, url]);
+
+  // A token is solid: front, back, and walls all carry the texture (projected
+  // UV), unlike tiles/cards where only the faces are textured. The tint is
+  // baked into the color and cache key so tinted variants don't collide.
+  const material = getSharedMaterial(`token:${url ?? 'none'}:${tintKey(tint)}`, {
+    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
+    map: texture ?? undefined,
+    roughness: 0.8,
+  });
+
+  return (
+    <group>
+      <mesh geometry={front} material={material} />
+      <mesh geometry={back} material={material} />
+      <mesh geometry={walls} material={material} />
+    </group>
+  );
+}
+
+interface TraceData {
+  shape: { outline: number[][]; holes?: number[][][] };
+  width: number;
+  height: number;
+}
+
+// Cache traces by URL so Suspense doesn't re-issue the request on every render
+// while the boundary is held open. A URL maps to either a pending promise (while
+// loading) or the resolved value (once loaded).
+const traceCache = new Map<string, TraceData | null | Promise<TraceData | null>>();
+
+/**
+ * Suspend on the alpha trace for `url`, resolving to the traced shape (or null
+ * when there's no URL / the trace fails). Throws the cached promise only while
+ * it's pending; once resolved, the value is returned directly so the retry
+ * render completes instead of suspending forever.
+ */
+function useTrace(url: string | undefined): TraceData | null {
+  if (!url) return null;
+  const cached = traceCache.get(url);
+  if (cached === undefined) {
+    const promise = traceImage(url, 'alpha', -TRACE_INSET).then((result) => {
+      const value: TraceData | null = result.shape
+        ? {
+            shape: result.shape,
+            width: result.width,
+            height: result.height,
+          }
+        : null;
+      // Replace the pending promise with the resolved value so later renders
+      // return it instead of re-suspending on a settled promise.
+      traceCache.set(url, value);
+      return value;
+    });
+    traceCache.set(url, promise);
+    throw promise;
+  }
+  if (cached instanceof Promise) throw cached;
+  return cached;
+}
+
+/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
+function toGeometry(extruded: ExtrudedGeometry) {
+  const { positions, normals, uvs, indices } = extruded;
+  const geo = new THREE.BufferGeometry();
+  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
+  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
+  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
+  geo.setIndex(new THREE.BufferAttribute(indices, 1));
+  return geo;
+}

apps/web/src/components/viewers/TokenViewer.tsx

@@ -1,28 +1,7 @@
-import { useTexture } from '@react-three/drei';
-import { useMemo } from 'react';
-import * as THREE from 'three';
 import type { TTSObject } from '@tts/shared';
-import {
-  extrudeShapeParts,
-  type ExtrudedGeometry,
-  type Shape,
-  type UVBounds,
-} from '@tts/mesh';
-import { traceImage } from '../../api';
 import Scene from './Scene';
-import { assetUrl } from './assetUrl';
-import {
-  getSharedGeometry,
-  getSharedMaterial,
-  objectTint,
-  tintKey,
-  tintedColor,
-} from './sharedResources';
-
-const TOKEN_SIZE = 1.8;
-
-/** How far (in trace pixels) the token silhouette is inset from the artwork. */
-const TRACE_INSET = 2;
+import { TokenObjectMesh } from './TokenMesh';
+import type { ViewerProps } from '../viewers';
 
 /**
  * A token: a short extruded shape with the texture on its top face. Uses
@@ -30,195 +9,15 @@ const TRACE_INSET = 2;
  * color when absent. The footprint is traced from the image's alpha channel via
  * the proxy `/trace` endpoint, so the token matches the artwork's silhouette.
  */
-export default function TokenViewer({ object }: { object: TTSObject }) {
+export default function TokenViewer({ object, fill }: ViewerProps) {
   return (
-    <Scene>
-      <TokenObjectMesh object={object} />
+    <Scene fill={fill}>
+      {/* Lay the token flat on the ground (see CardViewer). */}
+      <group rotation={[-Math.PI / 2, 0, 0]}>
+        <TokenObjectMesh object={object} />
+      </group>
     </Scene>
   );
 }
 
-/**
- * The token mesh for an object, exported so the full-setup view can compose it
- * into a shared scene.
- */
-export function TokenObjectMesh({ object }: { object: TTSObject }) {
-  const url = object.CustomImage?.ImageURL ?? object.CustomImage?.ImageSecondaryURL;
-  const thickness = object.CustomImage?.CustomToken?.Thickness ?? 0.1;
-
-  return <TokenMesh url={url} thickness={thickness} tint={objectTint(object)} />;
-}
-
-// Rendered inside the Canvas so `useTexture` can access the R3F store.
-// Exported so the full-setup view can compose it into a shared scene.
-export function TokenMesh({
-  url,
-  thickness,
-  tint,
-}: {
-  url?: string;
-  thickness: number;
-  tint: THREE.Color;
-}) {
-  const texture: THREE.Texture | null = url ? useTexture(assetUrl(url)) : null;
-
-  // Trace the image's alpha channel into a shape. Suspends until the trace
-  // resolves so the surrounding Suspense boundary (and `Bounds`) only mounts
-  // once the token geometry is present. Falls back to a circle when there's no
-  // image or the trace fails.
-  const trace = useTrace(url);
-
-  const { front, back, walls } = useMemo(() => {
-    // The traced shape and its UV framing share the same transform, so the
-    // full image rectangle maps to the same bounds in mesh coordinates.
-    const shape = trace ? toMeshShape(trace) : circleShape();
-    const uvBounds = trace ? toUvBounds(trace) : undefined;
-    const parts = extrudeShapeParts(shape, { height: thickness, uvBounds });
-    // Shared across tokens with the same source image (the trace is cached per
-    // URL, so the silhouette is deterministic) so the full-setup view reuses
-    // geometry.
-    const key = `token:${url ?? 'none'}:${thickness}`;
-    return {
-      front: getSharedGeometry(key + ':front', () => toGeometry(parts.front)),
-      back: getSharedGeometry(key + ':back', () => toGeometry(parts.back)),
-      walls: getSharedGeometry(key + ':walls', () => toGeometry(parts.walls)),
-    };
-  }, [trace, thickness, url]);
-
-  // A token is solid: front, back, and walls all carry the texture (projected
-  // UV), unlike tiles/cards where only the faces are textured. The tint is
-  // baked into the color and cache key so tinted variants don't collide.
-  const material = getSharedMaterial(`token:${url ?? 'none'}:${tintKey(tint)}`, {
-    color: tintedColor(texture ? new THREE.Color('#ffffff') : new THREE.Color('#52525b'), tint),
-    map: texture ?? undefined,
-    roughness: 0.8,
-  });
-
-  return (
-    <group>
-      <mesh geometry={front} material={material} />
-      <mesh geometry={back} material={material} />
-      <mesh geometry={walls} material={material} />
-    </group>
-  );
-}
-
-interface TraceData {
-  shape: { outline: number[][]; holes?: number[][][] };
-  width: number;
-  height: number;
-}
-
-// Cache traces by URL so Suspense doesn't re-issue the request on every render
-// while the boundary is held open. A URL maps to either a pending promise (while
-// loading) or the resolved value (once loaded).
-const traceCache = new Map<string, TraceData | null | Promise<TraceData | null>>();
-
-/**
- * Suspend on the alpha trace for `url`, resolving to the traced shape (or null
- * when there's no URL / the trace fails). Throws the cached promise only while
- * it's pending; once resolved, the value is returned directly so the retry
- * render completes instead of suspending forever.
- */
-function useTrace(url: string | undefined): TraceData | null {
-  if (!url) return null;
-  const cached = traceCache.get(url);
-  if (cached === undefined) {
-    const promise = traceImage(url, 'alpha', -TRACE_INSET).then((result) => {
-      const value: TraceData | null = result.shape
-        ? {
-            shape: result.shape,
-            width: result.width,
-            height: result.height,
-          }
-        : null;
-      // Replace the pending promise with the resolved value so later renders
-      // return it instead of re-suspending on a settled promise.
-      traceCache.set(url, value);
-      return value;
-    });
-    traceCache.set(url, promise);
-    throw promise;
-  }
-  if (cached instanceof Promise) throw cached;
-  return cached;
-}
-
-/** Convert raw extruded arrays into a three.js `BufferGeometry`. */
-function toGeometry(extruded: ExtrudedGeometry) {
-  const { positions, normals, uvs, indices } = extruded;
-  const geo = new THREE.BufferGeometry();
-  geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
-  geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
-  geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
-  geo.setIndex(new THREE.BufferAttribute(indices, 1));
-  return geo;
-}
-
-/** A circle fallback when there's no image to trace. */
-function circleShape(): Shape {
-  const pts: number[][] = [];
-  for (let i = 0; i < 48; i++) {
-    const a = (i / 48) * Math.PI * 2;
-    pts.push([Math.cos(a) * (TOKEN_SIZE / 2), Math.sin(a) * (TOKEN_SIZE / 2)]);
-  }
-  return { outline: pts };
-}
-
-/**
- * Convert a traced shape (image pixel coords, origin top-left, y-down) to a
- * mesh `Shape` (y-up, centered at the origin). Flips the y-axis, scales to
- * `TOKEN_SIZE`, centers the result, and normalizes winding so the outline is
- * counter-clockwise and holes are clockwise (as `@tts/mesh` expects).
- */
-function toMeshShape(trace: {
-  shape: { outline: number[][]; holes?: number[][][] };
-  width: number;
-  height: number;
-}): Shape {
-  const { shape, width, height } = trace;
-  const scale = TOKEN_SIZE / Math.max(width, height);
-  const ox = (width * scale) / 2;
-  const oy = (height * scale) / 2;
-  const transform = (pts: number[][]) =>
-    pts.map(([x, y]) => [x! * scale - ox, (height - y!) * scale - oy]);
-  return {
-    outline: normalizeWinding(transform(shape.outline), true),
-    holes: shape.holes?.map((h) => normalizeWinding(transform(h), false)),
-  };
-}
-
-/**
- * The full image rectangle, in mesh coordinates, used as the UV framing so the
- * texture aligns with the traced silhouette (which may be smaller than the
- * image when there is transparent padding).
- */
-function toUvBounds(trace: {
-  width: number;
-  height: number;
-}): UVBounds {
-  const scale = TOKEN_SIZE / Math.max(trace.width, trace.height);
-  const ox = (trace.width * scale) / 2;
-  const oy = (trace.height * scale) / 2;
-  return { minX: -ox, minY: -oy, maxX: ox, maxY: oy };
-}
-
-/**
- * Ensure a ring has the requested winding. `ccw` true yields a
- * counter-clockwise ring (outline); false yields clockwise (hole).
- */
-function normalizeWinding(pts: number[][], ccw: boolean): number[][] {
-  const isCcw = signedArea(pts) > 0;
-  return isCcw === ccw ? pts : [...pts].reverse();
-}
-
-/** Signed area of a polygon; positive means counter-clockwise. */
-function signedArea(points: number[][]): number {
-  let area = 0;
-  for (let i = 0; i < points.length; i++) {
-    const [x1, y1] = points[i]!;
-    const [x2, y2] = points[(i + 1) % points.length]!;
-    area += x1! * y2! - x2! * y1!;
-  }
-  return area / 2;
-}
+export { TokenObjectMesh, TokenMesh } from './TokenMesh';

apps/web/src/components/viewers/assetUrl.ts

@@ -1,8 +0,0 @@
-/**
- * Route an external asset URL through the proxy so it can be loaded by
- * three.js loaders (TextureLoader, GLTFLoader, etc.) despite the upstream host
- * omitting CORS headers.
- */
-export function assetUrl(url: string): string {
-  return `/asset?url=${encodeURIComponent(url)}`;
-}

apps/web/src/components/viewers/cardMaterial.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from 'vitest';
+import * as THREE from 'three';
+import { applyMapTransform } from './cardMaterial';
+
+describe('applyMapTransform', () => {
+  it('injects the repeat/offset uniforms and UV transform into the shader', () => {
+    const mat = new THREE.MeshStandardMaterial();
+    applyMapTransform(mat, new THREE.Vector2(0.5, 0.25), new THREE.Vector2(0.1, 0.2));
+
+    expect(mat.onBeforeCompile).toBeTypeOf('function');
+
+    const shader = {
+      uniforms: {} as Record<string, { value: unknown }>,
+      vertexShader: '#include <uv_vertex>\nvoid main() {}',
+    };
+    mat.onBeforeCompile!(shader as never, {} as never);
+
+    // Uniforms are copied, so the caller's vectors stay reusable.
+    expect(shader.uniforms.uMapRepeat!.value).toEqual(new THREE.Vector2(0.5, 0.25));
+    expect(shader.uniforms.uMapOffset!.value).toEqual(new THREE.Vector2(0.1, 0.2));
+    // The uniforms are declared in the GLSL (three.js does not auto-declare
+    // uniforms added via `onBeforeCompile`), and the override is injected right
+    // after the chunk include, which stays in place (it declares `vMapUv`/`uv`).
+    expect(shader.vertexShader).toContain('uniform vec2 uMapRepeat;');
+    expect(shader.vertexShader).toContain('uniform vec2 uMapOffset;');
+    expect(shader.vertexShader).toContain('#include <uv_vertex>\n\tvMapUv = uv * uMapRepeat + uMapOffset;');
+  });
+
+  it('copies the vectors so later mutation of the inputs has no effect', () => {
+    const mat = new THREE.MeshStandardMaterial();
+    const repeat = new THREE.Vector2(1, 1);
+    const offset = new THREE.Vector2(0, 0);
+    applyMapTransform(mat, repeat, offset);
+
+    repeat.set(9, 9);
+    offset.set(9, 9);
+
+    const shader = { uniforms: {} as Record<string, { value: unknown }>, vertexShader: '' };
+    mat.onBeforeCompile!(shader as never, {} as never);
+    expect(shader.uniforms.uMapRepeat!.value).toEqual(new THREE.Vector2(1, 1));
+    expect(shader.uniforms.uMapOffset!.value).toEqual(new THREE.Vector2(0, 0));
+  });
+});

apps/web/src/components/viewers/cardMaterial.ts

@@ -0,0 +1,51 @@
+import * as THREE from 'three';
+
+/**
+ * Per-card UV transform injected into a `MeshStandardMaterial` shader.
+ *
+ * Cards share one texture (the deck's sprite sheet, cached by drei) and one
+ * geometry, but each card samples a different sprite cell. Rather than cloning
+ * the texture per card (which re-uploads the sheet on every GPU bind), the
+ * repeat/offset is pushed into the material as a uniform. The shader source is
+ * identical across cards, so three.js still compiles a single shared program.
+ *
+ * We inject our own uniform instead of setting `texture.repeat`/`offset`
+ * because three r185 derives the map UVs from a `mapTransform` matrix that is
+ * refreshed from `map.matrix` every frame, overwriting any per-material
+ * transform we set on the shared texture.
+ */
+// Uniforms added via `onBeforeCompile` are not auto-declared by three.js, so
+// they must be declared in the GLSL explicitly (the built-in `mapTransform` is
+// declared in `uv_pars_vertex.glsl.js`).
+const UNIFORM_DECLS = /* glsl */ `
+	uniform vec2 uMapRepeat;
+	uniform vec2 uMapOffset;
+`;
+
+const VERTEX_INJECT = /* glsl */ `
+	#include <uv_vertex>
+	vMapUv = uv * uMapRepeat + uMapOffset;
+`;
+
+/**
+ * Apply a repeat/offset to a card material's map sampling. Call once per
+ * material (the transform is baked into the shader). `repeat`/`offset` are
+ * copied, so the caller may reuse the vectors.
+ */
+export function applyMapTransform(
+  material: THREE.MeshStandardMaterial,
+  repeat: THREE.Vector2,
+  offset: THREE.Vector2,
+): void {
+  // Clone eagerly so later mutation of the caller's vectors can't leak into
+  // the uniform once the material is compiled.
+  const r = repeat.clone();
+  const o = offset.clone();
+  material.onBeforeCompile = (shader) => {
+    shader.uniforms.uMapRepeat = { value: r };
+    shader.uniforms.uMapOffset = { value: o };
+    shader.vertexShader =
+      UNIFORM_DECLS +
+      shader.vertexShader.replace('#include <uv_vertex>', VERTEX_INJECT);
+  };
+}

apps/web/src/components/viewers/register.ts

@@ -8,16 +8,19 @@ import { registerViewer } from '../viewers';
 const TileViewer = lazy(() => import('./TileViewer'));
 const TokenViewer = lazy(() => import('./TokenViewer'));
 const CardViewer = lazy(() => import('./CardViewer'));
+const DeckViewer = lazy(() => import('./DeckViewer'));
 const CustomModelViewer = lazy(() => import('./CustomModelViewer'));
+const PdfViewer = lazy(() => import('./PdfViewer'));
 
 registerViewer('Tile', TileViewer);
 registerViewer('Custom_Tile', TileViewer);
 registerViewer('Custom_Token', TokenViewer);
 registerViewer('Card', CardViewer);
 registerViewer('CardCustom', CardViewer);
-registerViewer('Deck', CardViewer);
-registerViewer('DeckCustom', CardViewer);
-registerViewer('Custom_Deck', CardViewer);
+registerViewer('Deck', DeckViewer);
+registerViewer('DeckCustom', DeckViewer);
+registerViewer('Custom_Deck', DeckViewer);
 registerViewer('Custom_Model', CustomModelViewer);
 registerViewer('Custom_Model_Bag', CustomModelViewer);
-registerViewer('Custom_Model_Infinite_Bag', CustomModelViewer);
+registerViewer('Custom_Model_Infinite_Bag', CustomModelViewer);
+registerViewer('Custom_PDF', PdfViewer);

apps/web/src/components/viewers/sharedResources.ts

@@ -30,7 +30,7 @@ export function tintedColor(base: THREE.Color, tint: THREE.Color): THREE.Color {
  * the same image.
  *
  * These caches live for the session (like drei's global texture cache) and are
- * not disposed on unmount; see `docs/full-setup-view.md`.
+ * not disposed on unmount; see `docs/status/full-setup-view.md`.
  */
 
 const geometryCache = new Map<string, THREE.BufferGeometry>();

apps/web/src/pages/BgmPackagePage.tsx

@@ -0,0 +1,67 @@
+import { Link, useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import { findPackage } from './bgm';
+
+/**
+ * Summary view for a single bgm package: its metadata and counts of parts,
+ * surfaces, and setups, each linking to its collection page.
+ */
+export default function BgmPackagePage() {
+  const { id } = useParams<{ id: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const partCount = Object.keys(pkg.parts).length;
+  const surfaceCount = Object.keys(pkg.surfaces).length;
+  const setupCount = Object.keys(pkg.setups).length;
+
+  const sections = [
+    {
+      label: 'Parts',
+      count: partCount,
+      to: `/bgm/${pkg.meta.id}/parts`,
+    },
+    {
+      label: 'Surfaces',
+      count: surfaceCount,
+      to: `/bgm/${pkg.meta.id}/surfaces`,
+    },
+    {
+      label: 'Setups',
+      count: setupCount,
+      to: `/bgm/${pkg.meta.id}/setups`,
+    },
+  ];
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[{ label: 'Board games', to: '/bgm' }, { label: pkg.meta.title ?? pkg.meta.id }]}
+      />
+
+      <div>
+        <h1 className="text-2xl font-semibold">{pkg.meta.title ?? pkg.meta.id}</h1>
+        <p className="mt-1 text-sm text-zinc-400">
+          {pkg.meta.designer ? `${pkg.meta.designer} · ` : ''}
+          {pkg.meta.players ? `${pkg.meta.players} players · ` : ''}
+          {pkg.meta.language}
+        </p>
+      </div>
+
+      <ul className="grid gap-2 sm:grid-cols-3">
+        {sections.map((section) => (
+          <li key={section.label}>
+            <Link
+              to={section.to}
+              className="block rounded-lg border border-zinc-800 bg-zinc-900 p-3 hover:border-zinc-600"
+            >
+              <div className="font-medium">{section.label}</div>
+              <div className="mt-1 text-sm text-zinc-400">{section.count}</div>
+            </Link>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

apps/web/src/pages/BgmPage.tsx

@@ -0,0 +1,44 @@
+import { Link } from 'react-router-dom';
+import packages from 'virtual:bgm/packages';
+import Breadcrumbs from '../components/Breadcrumbs';
+
+/**
+ * Lists every discovered bgm package. The `virtual:bgm/packages` module's
+ * default export is an array of all packages the loader found in the games
+ * root.
+ */
+export default function BgmPage() {
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs crumbs={[{ label: 'Board games' }]} />
+      <div>
+        <h1 className="text-2xl font-semibold">Board games</h1>
+        <p className="mt-1 text-sm text-zinc-400">
+          {packages.length} package{packages.length === 1 ? '' : 's'} discovered.
+        </p>
+      </div>
+
+      <ul className="grid gap-2 sm:grid-cols-2">
+        {packages.map((pkg) => (
+          <li key={pkg.meta.id}>
+            <Link
+              to={`/bgm/${pkg.meta.id}`}
+              className="block rounded-lg border border-zinc-800 bg-zinc-900 p-3 hover:border-zinc-600"
+            >
+              <div className="font-medium">{pkg.meta.title ?? pkg.meta.id}</div>
+              <div className="mt-1 text-xs text-zinc-400">
+                {pkg.meta.designer ? `${pkg.meta.designer} · ` : ''}
+                {pkg.meta.players ? `${pkg.meta.players} players · ` : ''}
+                {pkg.meta.language}
+              </div>
+              <div className="mt-1 text-xs text-zinc-500">
+                {Object.keys(pkg.parts).length} parts · {Object.keys(pkg.surfaces).length} surfaces ·{' '}
+                {Object.keys(pkg.setups).length} setups
+              </div>
+            </Link>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

apps/web/src/pages/FullSetupPage.tsx

@@ -5,10 +5,10 @@ import type { TTSObject } from '@tts/shared';
 import { useModStore } from '../stores/modStore';
 import { useSearchStore } from '../stores/searchStore';
 import Scene from '../components/viewers/Scene';
-import { TileObjectMesh } from '../components/viewers/TileViewer';
-import { TokenObjectMesh } from '../components/viewers/TokenViewer';
-import { CardObjectMesh } from '../components/viewers/CardViewer';
-import { CustomModelMesh } from '../components/viewers/CustomModelViewer';
+import { TileObjectMesh } from '../components/viewers/TileMesh';
+import { TokenObjectMesh } from '../components/viewers/TokenMesh';
+import { CardObjectMesh } from '../components/viewers/CardMesh';
+import { CustomModelMesh } from '../components/viewers/CustomModelMesh';
 import { objectPlacement } from '../components/viewers/transform';
 
 /** Object classes that carry renderable assets (mirrors `viewers/register.ts`). */
@@ -42,7 +42,7 @@ export default function FullSetupPage() {
   }, [id, item?.fileUrl, load]);
 
   const objects = useMemo(
-    () => (mod ? flattenObjects(mod) : []),
+    () => (mod ? flattenObjects(mod.mod) : []),
     [mod],
   );
 

apps/web/src/pages/ModPage.tsx

@@ -4,9 +4,8 @@ import { Link, useParams } from 'react-router-dom';
 import { buildTree, collectRefs } from '@tts/extract';
 import { useModStore } from '../stores/modStore';
 import { useSearchStore } from '../stores/searchStore';
-import { modFileUrl } from '../api';
 import ObjectTree from '../components/ObjectTree';
-import ErrorBoundary from '../components/ErrorBoundary';
+import { ErrorBoundary } from '@tts/tabletop';
 import { resolveViewer } from '../components/viewers';
 import { iconsForObject } from '../components/objectIcons';
 // Register the 3D viewers (side effect) so `resolveViewer` can find them.
@@ -25,8 +24,8 @@ export default function ModPage() {
     if (id) load(id, item?.fileUrl);
   }, [id, item?.fileUrl, load]);
 
-  const tree = useMemo(() => (mod ? buildTree(mod) : []), [mod]);
-  const refs = useMemo(() => (mod ? collectRefs(mod) : []), [mod]);
+  const tree = useMemo(() => (mod ? buildTree(mod.mod) : []), [mod]);
+  const refs = useMemo(() => (mod ? collectRefs(mod.mod) : []), [mod]);
 
   const selected = useMemo(
     () => (mod ? findInTree(tree, selectedPath) : undefined),
@@ -40,78 +39,37 @@ export default function ModPage() {
   const Viewer = selected ? resolveViewer(selected.object) : null;
 
   return (
-    <div className="space-y-6">
-      <div>
-        <h1 className="text-2xl font-semibold">Mod {id}</h1>
-        <p className="mt-1 text-sm text-zinc-400">
-          {mod.GameMode} · {mod.Date} · {tree.length} objects · {refs.length}{' '}
-          asset refs
-        </p>
-        <div className="mt-3 flex gap-2">
-          <a
-            href={modFileUrl(id!, item?.fileUrl)}
-            className="inline-block rounded-lg bg-zinc-100 px-4 py-2 text-sm font-medium text-zinc-900 hover:bg-zinc-300"
-          >
-            Download save file
-          </a>
-          <Link
-            to={`/mod/${id}/setup`}
-            className="inline-block rounded-lg border border-zinc-700 px-4 py-2 text-sm font-medium text-zinc-200 hover:bg-zinc-800"
-          >
-            Full setup
-          </Link>
-        </div>
-      </div>
+    <div className="flex h-full min-h-0">
+      {/* Independently scrolling tree; the filter bar stays pinned above it. */}
+      <aside className="flex h-full min-h-0 w-72 shrink-0 flex-col border-r border-zinc-800 bg-zinc-900">
+        <ObjectTree
+          nodes={tree}
+          selectedPath={selectedPath}
+          onSelect={setSelectedPath}
+        />
+      </aside>
 
-      <div className="grid grid-cols-1 gap-6 lg:grid-cols-[280px_1fr]">
-        <aside className="rounded-lg border border-zinc-800 bg-zinc-900 p-2">
-          <ObjectTree
-            nodes={tree}
-            selectedPath={selectedPath}
-            onSelect={setSelectedPath}
-          />
-        </aside>
-
-        <section className="rounded-lg border border-zinc-800 bg-zinc-900 p-4">
-          {selected ? (
-            <>
-              <header className="mb-4">
-                <span
-                  title={selected.object.Name}
-                  className="inline-flex items-center gap-1 text-zinc-400"
-                >
-                  {iconsForObject(selected.object.Name).map((icon) => (
-                    <Icon key={icon} icon={icon} className="h-5 w-5" />
-                  ))}
-                </span>
-                <h2 className="mt-1 text-lg font-semibold">{selected.label}</h2>
-                <p className="font-mono text-xs text-zinc-500">
-                  {selected.object.GUID}
-                </p>
-              </header>
-              {Viewer && (
-                <ErrorBoundary>
-                  <Suspense
-                    fallback={
-                      <div className="flex h-80 items-center justify-center text-sm text-zinc-500">
-                        Loading viewer…
-                      </div>
-                    }
-                  >
-                    {/* Key by selection path so the Canvas remounts and the
-                        camera refits to the newly selected object. */}
-                    <Viewer key={selectedPath} object={selected.object} />
-                  </Suspense>
-                </ErrorBoundary>
-              )}
-            </>
-          ) : (
-            <p className="text-sm text-zinc-500">
-              Select an object from the tree to inspect it.
-            </p>
-          )}
-        </section>
-      </div>
+      <section className="h-full min-h-0 flex-1 p-4">
+        {selected && Viewer ? (
+          /* Key by selection path so the Canvas remounts and the camera
+             refits to the newly selected object. */
+          <ErrorBoundary key={selectedPath}>
+            <Suspense
+              fallback={
+                <div className="flex h-full items-center justify-center text-sm text-zinc-500">
+                  Loading viewer…
+                </div>
+              }
+            >
+              <Viewer object={selected.object} fill />
+            </Suspense>
+          </ErrorBoundary>
+        ) : (
+          <div className="flex h-full items-center justify-center text-sm text-zinc-500">
+            Select an object from the tree to inspect it.
+          </div>
+        )}
+      </section>
     </div>
   );
 }

apps/web/src/pages/PartPage.tsx

@@ -0,0 +1,55 @@
+import { useParams } from 'react-router-dom';
+import { PartView, ErrorBoundary } from '@tts/tabletop';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import Scene from '../components/viewers/Scene';
+import { findPackage } from './bgm';
+
+/** Detail view for a single part within a package. */
+export default function PartPage() {
+  const { id, type, part } = useParams<{ id: string; type: string; part: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const found = pkg.parts[`${type}#${part}`];
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Parts', to: `/bgm/${pkg.meta.id}/parts` },
+          { label: `${type}#${part}` },
+        ]}
+      />
+
+      {!found ? (
+        <p className="text-sm text-zinc-400">No part “{type}#{part}”.</p>
+      ) : (
+        <div className="space-y-4">
+          <div>
+            <h1 className="text-2xl font-semibold">
+              {found.type}#{found.id}
+            </h1>
+            <p className="mt-1 text-sm text-zinc-400">
+              {found.size ? `size ${found.size.join('×')}mm` : ''}
+              {found.fillet ? ` · fillet ${found.fillet}mm` : ''}
+            </p>
+          </div>
+          {/* The boundary wraps the Canvas (Scene), not PartView, so its HTML
+              fallback renders outside the r3f namespace. The library's proxy
+              calls default to the host's `/asset` and `/trace` paths. */}
+          <ErrorBoundary>
+            <Scene>
+              <PartView part={found} baseUrl={found.baseUrl} />
+            </Scene>
+          </ErrorBoundary>
+          <pre className="overflow-x-auto rounded-lg border border-zinc-800 bg-zinc-900 p-3 text-xs text-zinc-400">
+            {JSON.stringify(found, null, 2)}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/pages/PartsPage.tsx

@@ -0,0 +1,61 @@
+import { Link, useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import { findPackage } from './bgm';
+
+/**
+ * All parts of a package, grouped by part type. Each part links to its
+ * `/bgm/:id/parts/:type/:part` detail page.
+ */
+export default function PartsPage() {
+  const { id } = useParams<{ id: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const parts = Object.values(pkg.parts);
+  const byType = new Map<string, typeof parts>();
+  for (const part of parts) {
+    const list = byType.get(part.type) ?? [];
+    list.push(part);
+    byType.set(part.type, list);
+  }
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Parts' },
+        ]}
+      />
+
+      <div>
+        <h1 className="text-2xl font-semibold">Parts</h1>
+        <p className="mt-1 text-sm text-zinc-400">{parts.length} part{parts.length === 1 ? '' : 's'}.</p>
+      </div>
+
+      {[...byType.entries()].map(([type, list]) => (
+        <section key={type} className="space-y-2">
+          <h2 className="text-lg font-semibold">{type}</h2>
+          <ul className="grid gap-2 sm:grid-cols-2">
+            {list.map((part) => (
+              <li key={`${part.type}#${part.id}`} className="rounded-lg border border-zinc-800 bg-zinc-900 p-3">
+                <Link
+                  to={`/bgm/${pkg.meta.id}/parts/${part.type}/${part.id}`}
+                  className="font-medium hover:text-zinc-100"
+                >
+                  {part.id}
+                </Link>
+                <div className="mt-1 text-xs text-zinc-400">
+                  {part.size ? `size ${part.size.join('×')}mm` : ''}
+                  {part.fillet ? ` · fillet ${part.fillet}mm` : ''}
+                </div>
+              </li>
+            ))}
+          </ul>
+        </section>
+      ))}
+    </div>
+  );
+}

apps/web/src/pages/SetupPage.tsx

@@ -0,0 +1,47 @@
+import { useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import TabletopScene from '../components/tabletop/TabletopScene';
+import { findPackage } from './bgm';
+
+/** Detail view for a single setup within a package. */
+export default function SetupPage() {
+  const { id, type, setup } = useParams<{ id: string; type: string; setup: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const found = pkg.setups[`${type}#${setup}`];
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Setups', to: `/bgm/${pkg.meta.id}/setups` },
+          { label: `${type}#${setup}` },
+        ]}
+      />
+
+      {!found ? (
+        <p className="text-sm text-zinc-400">No setup “{type}#{setup}”.</p>
+      ) : (
+        <div className="space-y-4">
+          <div>
+            <h1 className="text-2xl font-semibold">
+              {found.type}#{found.id}
+            </h1>
+            <p className="mt-1 text-sm text-zinc-400">
+              {Object.keys(found.setup).length} path
+              {Object.keys(found.setup).length === 1 ? '' : 's'}
+            </p>
+          </div>
+          <TabletopScene pkg={pkg} setup={found} />
+          <pre className="overflow-x-auto rounded-lg border border-zinc-800 bg-zinc-900 p-3 text-xs text-zinc-400">
+            {JSON.stringify(found.setup, null, 2)}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/pages/SetupsPage.tsx

@@ -0,0 +1,48 @@
+import { Link, useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import { findPackage } from './bgm';
+
+/**
+ * All setups of a package. Each setup links to its
+ * `/bgm/:id/setups/:type/:setup` detail page.
+ */
+export default function SetupsPage() {
+  const { id } = useParams<{ id: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const setups = Object.values(pkg.setups);
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Setups' },
+        ]}
+      />
+
+      <div>
+        <h1 className="text-2xl font-semibold">Setups</h1>
+        <p className="mt-1 text-sm text-zinc-400">
+          {setups.length} setup{setups.length === 1 ? '' : 's'}.
+        </p>
+      </div>
+
+      <ul className="grid gap-2 sm:grid-cols-2">
+        {setups.map((setup) => (
+          <li key={`${setup.type}#${setup.id}`} className="rounded-lg border border-zinc-800 bg-zinc-900 p-3">
+            <Link
+              to={`/bgm/${pkg.meta.id}/setups/${setup.type}/${setup.id}`}
+              className="font-medium hover:text-zinc-100"
+            >
+              {setup.id}
+            </Link>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

apps/web/src/pages/SurfacePage.tsx

@@ -0,0 +1,44 @@
+import { useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import { findPackage } from './bgm';
+
+/** Detail view for a single surface within a package. */
+export default function SurfacePage() {
+  const { id, type, surface } = useParams<{ id: string; type: string; surface: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const found = pkg.surfaces[`${type}#${surface}`];
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Surfaces', to: `/bgm/${pkg.meta.id}/surfaces` },
+          { label: `${type}#${surface}` },
+        ]}
+      />
+
+      {!found ? (
+        <p className="text-sm text-zinc-400">No surface “{type}#{surface}”.</p>
+      ) : (
+        <div className="space-y-4">
+          <div>
+            <h1 className="text-2xl font-semibold">
+              {found.type}#{found.id}
+            </h1>
+            <p className="mt-1 text-sm text-zinc-400">
+              {found.size ? `size ${found.size.join('×')}mm` : ''} · {found.layout.length} routes
+            </p>
+          </div>
+          <pre className="overflow-x-auto rounded-lg border border-zinc-800 bg-zinc-900 p-3 text-xs text-zinc-400">
+            {JSON.stringify(found, null, 2)}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/pages/SurfacesPage.tsx

@@ -0,0 +1,51 @@
+import { Link, useParams } from 'react-router-dom';
+import Breadcrumbs from '../components/Breadcrumbs';
+import PackageMissing from '../components/PackageMissing';
+import { findPackage } from './bgm';
+
+/**
+ * All surfaces of a package. Each surface links to its
+ * `/bgm/:id/surfaces/:type/:surface` detail page.
+ */
+export default function SurfacesPage() {
+  const { id } = useParams<{ id: string }>();
+  const pkg = findPackage(id);
+  if (!pkg) return <PackageMissing id={id ?? ''} />;
+
+  const surfaces = Object.values(pkg.surfaces);
+
+  return (
+    <div className="space-y-6">
+      <Breadcrumbs
+        crumbs={[
+          { label: 'Board games', to: '/bgm' },
+          { label: pkg.meta.title ?? pkg.meta.id, to: `/bgm/${pkg.meta.id}` },
+          { label: 'Surfaces' },
+        ]}
+      />
+
+      <div>
+        <h1 className="text-2xl font-semibold">Surfaces</h1>
+        <p className="mt-1 text-sm text-zinc-400">
+          {surfaces.length} surface{surfaces.length === 1 ? '' : 's'}.
+        </p>
+      </div>
+
+      <ul className="grid gap-2 sm:grid-cols-2">
+        {surfaces.map((surface) => (
+          <li key={`${surface.type}#${surface.id}`} className="rounded-lg border border-zinc-800 bg-zinc-900 p-3">
+            <Link
+              to={`/bgm/${pkg.meta.id}/surfaces/${surface.type}/${surface.id}`}
+              className="font-medium hover:text-zinc-100"
+            >
+              {surface.id}
+            </Link>
+            <div className="mt-1 text-xs text-zinc-400">
+              {surface.size ? `size ${surface.size.join('×')}mm` : ''} · {surface.layout.length} routes
+            </div>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

apps/web/src/pages/bgm.ts

@@ -0,0 +1,7 @@
+import packages from 'virtual:bgm/packages';
+import type { SerializedPackage } from '@tts/bgm';
+
+/** Look up a bgm package by id from the `virtual:bgm/packages` module. */
+export function findPackage(id: string | undefined): SerializedPackage | undefined {
+  return packages.find((p) => p.meta.id === id);
+}

apps/web/src/stores/modStore.ts

@@ -1,11 +1,11 @@
 import { create } from 'zustand';
-import type { TTSMod } from '@tts/shared';
+import type { ModDetails } from '@tts/shared';
 import { fetchMod } from '../api';
 
 interface ModState {
   id: string | null;
   fileUrl?: string;
-  mod: TTSMod | null;
+  mod: ModDetails | null;
   loading: boolean;
   error: string | null;
   load: (id: string, fileUrl?: string) => Promise<void>;
@@ -21,11 +21,11 @@ export const useModStore = create<ModState>((set) => ({
   load: async (id, fileUrl) => {
     set({ loading: true, error: null, id, fileUrl });
     try {
-      const mod = await fetchMod(id, fileUrl);
-      set({ mod, loading: false });
+      const details = await fetchMod(id, fileUrl);
+      set({ mod: details, loading: false });
     } catch (err) {
       set({ loading: false, error: String(err) });
     }
   },
-  clear: () => set({ id: null, fileUrl: undefined, mod: null, error: null, loading: false }),
+  clear: () => set({ id: null, fileUrl: undefined, mod: null, loading: false, error: null }),
 }));

apps/web/src/vite-env.d.ts

@@ -1 +1,19 @@
-/// <reference types="vite/client" />
+/// <reference types="vite/client" />
+
+/**
+ * Ambient types for the virtual `bgm` modules served by the bgm vite plugin.
+ *
+ * - `virtual:bgm/packages` — every discovered package.
+ * - `virtual:bgm/package/<id>` — a single package's assembled JSON.
+ */
+declare module 'virtual:bgm/packages' {
+  import type { SerializedPackage } from '@tts/bgm';
+  const packages: SerializedPackage[];
+  export default packages;
+}
+
+declare module 'virtual:bgm/package/*' {
+  import type { SerializedPackage } from '@tts/bgm';
+  const pkg: SerializedPackage;
+  export default pkg;
+}

apps/web/vite.config.ts

@@ -1,9 +1,15 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 import tailwindcss from '@tailwindcss/vite';
+import { fileURLToPath } from 'node:url';
+import { bgm } from '@tts/bgm';
 
 export default defineConfig({
-  plugins: [react(), tailwindcss()],
+  plugins: [
+    react(),
+    tailwindcss(),
+    bgm({ root: fileURLToPath(new URL('../../games', import.meta.url)) }),
+  ],
   server: {
     // Proxy API calls to the Hono backend during development.
     proxy: {
@@ -11,6 +17,7 @@ export default defineConfig({
       '/items': 'http://localhost:3000',
       '/health': 'http://localhost:3000',
       '/asset': 'http://localhost:3000',
+      '/pdf': 'http://localhost:3000',
       '/trace': 'http://localhost:3000',
     },
   },

docs/architecture.md

@@ -2,8 +2,8 @@
 
 > **Scope:** The system's architecture and dependency graph. For implementation
 > details (files, endpoints, build order), see
-> [`implementation-plan.md`](./implementation-plan.md). For the rationale behind
-> key decisions, see [`decisions.md`](./decisions.md).
+> [`status/implementation-plan.md`](./status/implementation-plan.md). For the
+> rationale behind key decisions, see [`decisions.md`](./decisions.md).
 
 ## Overview
 
@@ -32,6 +32,7 @@ shared types/validation package.
 | `packages/tts`     | Fetch save from Steam, BSON-parse to `TTSMod` | Node       |
 | `packages/extract` | Analyze a `TTSMod`: objects, refs, assets   | Isomorphic   |
 | `packages/mesh`    | 2D shapes + extrusion into 3D mesh geometry | Isomorphic   |
+| `packages/engine`  | Message bus, queue/tick, triggers, orchestrators | Isomorphic   |
 | `packages/shared`  | Shared types + zod schemas                  | Isomorphic   |
 
 ## Dependency graph
@@ -55,7 +56,7 @@ apps/web ──► apps/proxy ──► packages/tts ──► packages/shared
 - **`apps/web` → `packages/mesh`** — extrudes 2D shapes into 3D geometry
   (`{ front, back, walls }`) for the tile, token, and card viewers.
 - **`apps/proxy` → `packages/tts`** — calls `fetchMod` / `getFileName` to serve
-  item requests.
+  item requests (the filename is derived from the save URL path).
 - **`apps/proxy` → `packages/shared`** — uses shared types and zod schemas for
   request/response validation.
 - **`packages/tts` → `packages/shared`** — consumes `TTSMod` / `TTSObject`

docs/bgm/commands.md

@@ -0,0 +1,156 @@
+# bgm-commands
+
+Command execution for [bgm](./format.md) board games, built into
+[`@tts/tabletop`](./tabletop.md). A command is a unit of scripted
+interaction — focus the camera, wait for a tap, move a part, show a caption —
+that runs against the tabletop state store and render layer.
+
+This doc covers **command execution**: the async lifecycle, run contexts, and
+tap interaction. The message layer above this — how commands are *declared*
+and *fired* (triggers, orchestrators, the message queue) — is specified in
+[`engine.md`](./engine.md). Commands are async functions registered
+with the engine's handler registry; `@tts/tabletop` provides the concrete
+commands that mutate the tabletop store and render layer.
+
+## 1. async commands
+
+A command is an async function that returns a result. Every command ends in
+one of three states, emitted as a message discriminated on the type suffix
+(see `engine.md` §3):
+
+- `:done` — completed normally.
+- `:cancel` — interrupted (a newer command superseded it, the user skipped,
+  the surface was disabled). **Not a failure.**
+- `:error` — genuinely failed (asset missing, bad path, a thrown exception).
+
+`cancel` is distinct from `error`: a superseded or skipped command stops
+cleanly, while a broken command surfaces loudly. The runtime treats them
+differently — a script that is superseded unwinds without alarming the player,
+but an `error` is reported.
+
+```ts
+type CommandResult<Name extends string, R = void> =
+  | { type: `${Name}:done`; data: R }
+  | { type: `${Name}:cancel` }
+  | { type: `${Name}:error`; error: Error };
+```
+
+## 2. run contexts
+
+Each command invocation creates its own **run context**: the unit of
+cancellation and the carrier of command-specific state.
+
+```ts
+interface CommandRun {
+  id: string;
+  command: Command;
+  status: 'running' | 'ok' | 'cancel' | 'error';
+  data: unknown; // command-specific state, e.g. a pending tap target
+  cancel(): void;
+  done: Promise<CommandResult>;
+}
+```
+
+A command **owns its own state and its own waiting**; the runtime only
+orchestrates. Its job is to start a run, track its status, cancel it when
+superseded, and react to its terminal state. This keeps commands
+self-contained and testable in isolation.
+
+## 3. fire-and-forget vs self-managed waiting
+
+Commands fall into two categories:
+
+- **Fire-and-forget** (`focus`, `highlight`, `caption`) — start and return
+  `ok` immediately (or when their tween settles). The runtime does not block
+  on them.
+- **Self-managed waiting** (`wait: tap`, a dialog) — the command resolves its
+  own promise when its condition is met. The runtime just awaits it.
+
+Fire-and-forget commands still get a run context and a cancel path. A `focus`
+tween superseded by a newer `focus` must be cancellable, or two cameras fight.
+"Fire-and-forget" means the runtime doesn't await it, not that it has no
+lifecycle.
+
+**Supersede groups** cancel a running command when another in the same group
+starts. A `focus` command belongs to a `camera` group, so a second `focus`
+cancels the first. A superseded command's `signal` is aborted, and it emits
+`:cancel`.
+
+A command is an async function taking the `RunContext` (with its `args`):
+
+```ts
+type Command<Args, Result> = (ctx: RunContext & { args: Args }) => Promise<Result>;
+```
+
+The engine wraps it: it builds the context from the message, runs the function,
+and emits `:done` on resolve, `:cancel` on abort, `:error` on throw.
+
+## 4. tap interaction
+
+Only tap interaction is supported. A tap on a part is detected and reported to
+the command layer as a `TapEvent`. Parts may declare **trigger points** —
+named, circular regions the author wants to be tappable.
+
+```ts
+interface TriggerPoint {
+  id: string;
+  position: [number, number]; // part-local frame, mm
+  radius: number;             // mm
+}
+
+interface TapEvent {
+  part: string;               // package:type#id
+  position: [number, number]; // part-local frame, mm
+  trigger: TriggerPoint | null; // nearest within radius, or null
+}
+```
+
+Rules:
+
+- Trigger points are authored in the **part's local frame** (mm, relative to
+  the part's origin), not world space. A part moves, rotates, and flips
+  (facing), so a world-space point would break the moment it moves. The tap
+  point is transformed into the part's local frame at tap time.
+- Distance is measured in the part's plane. The reported trigger point is the
+  nearest one within its `radius`; ties go to the first declared.
+- **Every tap on the part is reported**, with the nearest trigger point (or
+  `null` when none is in range). The command decides how to react — resolve,
+  reject with a "wrong spot" shake, or ignore. The runtime stays dumb; the
+  command owns the UX.
+
+Commands subscribe to the tap stream via the context and unsubscribe on
+cancel, so a cancelled `wait: tap` never leaks a handler.
+
+## 5. run context
+
+The context a command receives is the handle to everything it can affect. The
+engine defines the base `RunContext` (see `engine.md` §5): `signal`
+(cancellation), `emit`, `wait`, and `enableTrigger`/`disableTrigger`. Tabletop
+extends it with the handles commands need to mutate the board:
+
+```ts
+interface TabletopRunContext extends RunContext {
+  pkg: Package;
+  store: TabletopStore; // movePart, setPart, enableSurface, ...
+  onTap(handler: (e: TapEvent) => void): () => void; // returns unsubscribe
+  // camera, highlight, and overlay handles are added as those subsystems land
+}
+```
+
+## 6. where trigger points come from
+
+The tap detector reads trigger points from a runtime map keyed by part id; it
+does not care where they are declared. Declaration (on the part definition, in
+a setup, or in a script) is the deferred "how to declare" half and lives in
+`format.md`.
+
+## Open decisions
+
+- **Where commands are declared** — the `script` role and its schema
+  (`format.md`), deferred.
+- **Animation** — a general "ease toward target placement" layer (preferred)
+  vs explicit per-move tweens.
+- **Camera** — `CameraControls` (drei) vs hand-rolled.
+- **Triggering** — does a setup reference a script to auto-run, or is a script
+  a separate page the player picks?
+- **Narration** — pre-recorded audio assets per script, or TTS at runtime?

docs/bgm/engine.md

@@ -0,0 +1,263 @@
+# bgm-engine
+
+The message layer that drives [bgm](./format.md) board games, built into
+[`@tts/engine`](../architecture.md). It unifies the two halves of scripted
+interaction — *declaring* what should happen and *executing* it — into a single
+reactive loop: **messages** flow through a **queue**, and **handlers** react to
+them.
+
+This doc covers the message model (what flows), the queue and its tick (how it
+flows), and the handlers (who reacts). Command *execution* — the async
+lifecycle, run contexts, and tap interaction — is specified in
+[`commands.md`](./commands.md); this doc is the layer above it.
+
+## package split
+
+The engine is a **pure** package: the message bus, queue, tick, trigger
+registry, and the handler runner. It has no r3f, no React, and no store, so it
+is node-testable in isolation (mirroring `@tts/extract`'s isomorphic, zero-dep
+style). It defines the contract — `Message`, the handler registry, `Trigger`,
+`Orchestrator`, and `RunContext`.
+
+[`@tts/tabletop`](./tabletop.md) is the intended consumer of that contract:
+it will register the built-in commands (`move`, `focus`, `caption`,
+`enableSurface`, ...) that mutate the tabletop store and drive the render layer.
+The engine never imports tabletop, and tabletop is expected to depend on the
+engine for the message types and the handler registry. **This wiring is designed
+but not yet landed** — today `@tts/tabletop` has no dependency on the engine;
+it ships its state store and render layer standalone (see
+[`../status/bgm-tabletop.md`](../status/bgm-tabletop.md)). A headless sim or bot
+harness can consume the engine without the render layer.
+
+## 1. messages
+
+A **message** is the unit of communication. It is both an *event* (something
+happened) and an *intent* (something should happen) — the two are the same
+thing. A message is dispatched to the handlers registered for its `type`; a
+handler may emit new messages in response.
+
+Messages are a **discriminated union** on `type`. The engine defines the
+generic shapes; the host's concrete union extends them with its own command
+types.
+
+```ts
+interface TapMessage {
+  type: 'tap';
+  data: TapEvent; // part, position, trigger
+}
+
+interface CommandMessage<Name extends string, Args> {
+  type: Name;
+  data: Args;
+}
+```
+
+A message is identified by `type`, matching the format's `type#id`
+convention. A `move` message both *runs* the move command and is *observable*
+as an event; the command's completion is itself a message, which is what
+triggers match and orchestrators await.
+
+The loop is just: **message → handler → message**. Handlers consume messages
+and emit new ones; the queue serializes them.
+
+## 2. the queue and ticking
+
+Messages are not processed inline. They are **enqueued** and handled on the
+next **tick**. This kills reentrancy (a handler cannot cause unbounded
+recursion), gives a natural debounce, and makes the whole system a
+deterministic frame.
+
+### tick contract
+
+The engine is pure — it has no render loop and must stay node-testable. It
+exposes `tick()`, and the host calls it:
+
+- In `@tts/tabletop`, a `useFrame` drives `tick()`.
+- In tests, `tick()` is called manually.
+
+The engine never assumes a render loop.
+
+### drain semantics
+
+- **Snapshot-and-drain.** At `tick()`, snapshot the queue and process it.
+  Messages emitted *during* the drain go to the *next* tick. This guarantees
+  no reentrancy within a drain and makes ordering deterministic.
+- **FIFO within a tick.** Simple and predictable.
+- **One tick drains the whole snapshot** (not one message per tick), so a
+  burst of messages all resolve in one frame.
+
+### awaiting
+
+A handler suspends on `await ctx.wait(pred)` and resumes when a matching
+message is processed during a drain. Its own emissions go to the next tick, so
+it cannot re-enter itself.
+
+## 3. message types
+
+### interaction messages
+
+Interaction is the player's input, reported to the engine as messages. Only
+tap interaction is supported (see `commands.md` §4).
+
+```ts
+interface TapMessage {
+  type: 'tap';
+  data: TapEvent;
+}
+```
+
+A tap on a part is reported with the nearest trigger point (or `null` on a
+miss). The handler decides how to react — resolve, reject with a "wrong spot"
+shake, or ignore. The runtime stays dumb; the handler owns the UX.
+
+### command messages
+
+A command message names a command to run. Its handler is the command
+implementation; its completion is emitted as a result message. A command's
+result is a **discriminated union on the type suffix**, carrying the terminal
+state:
+
+```ts
+type CommandResult<Name extends string, R = void> =
+  | { type: `${Name}:done`; data: R }
+  | { type: `${Name}:cancel` }
+  | { type: `${Name}:error`; error: Error };
+
+// e.g. move:done { data: MoveResult } | move:cancel | move:error
+```
+
+The command-id-as-key convention means a message both *is* the intent and
+*observes* the result. `move:done`, `focus:done`, etc. are the messages that
+triggers match and orchestrators await. A cancelled command emits `:cancel`, an
+errored one `:error` — a trigger matching `move:done` does not fire on a
+cancel.
+
+## 4. handlers
+
+There are three kinds of handler. All three consume messages and emit
+messages; they differ in how they're declared and how they run.
+
+| Handler | Declared | Runs | Purpose |
+| --- | --- | --- | --- |
+| **Trigger** | data (yaml) | synchronously on match | declarative reactive glue |
+| **Orchestrator** | code (`main.ts`) | async, awaits | imperative flow |
+| **Command** | code (built-in) | async, on its message | atomic execution |
+
+### triggers — declarative reactive glue
+
+A trigger matches a message by `type` and named params, and emits messages in
+response. It is declared as data, keyed by `role+type+id` like other defs, and
+collision-checked the same way.
+
+```yaml
+role: trigger
+type: tap
+id: draw
+match:
+  part: carcassonne:tile#a
+  trigger: draw
+emit:
+  - move: { part: carcassonne:tile#a, to: /grid/5/5 }
+  - focus: { path: /grid/5/5 }
+```
+
+- `type` selects the message kind; `match` binds named params from the
+  payload (like a route's candidates).
+- `emit` uses the command-id-as-key convention.
+- Multiple triggers can match the same message — both fire, which is usually
+  what you want.
+- A trigger is a **pre-registered handler**: it's a message consumer that
+  emits commands. An orchestrator can do the same thing imperatively with
+  `ctx.on(...)`.
+
+### orchestrators — imperative async flow
+
+An orchestrator is the code counterpart to a trigger: an async function that
+emits messages and awaits matching ones. It is a proper TS module, declared
+per folder as `main.ts` — unique per folder like `package.yaml`.
+
+```ts
+// main.ts
+export default async function main(ctx: RunContext): Promise<void> {
+  await ctx.focus({ path: '/deck' });
+  await ctx.caption({ text: 'Draw a tile' });
+  const tap = await ctx.wait((m) => m.type === 'tap');
+  await ctx.move({ part: tap.data.part, to: '/grid/5/5' });
+}
+```
+
+- **`main.ts` is executable code, loaded by the host, not the engine.** The
+  engine defines the contract (the orchestrator type and runner); the host
+  dynamically imports `main.ts` and hands the exported orchestrator to the
+  engine. The engine never imports user code.
+- **A default export async function.** `main.ts` exports a single async
+  function as its default export, taking the `RunContext`. It is the folder's
+  orchestrator.
+- **Trigger control lives here.** The orchestrator toggles triggers at runtime
+  by their `type#id`:
+
+  ```ts
+  ctx.enableTrigger('tap', 'draw');
+  ctx.disableTrigger('tap', 'draw');
+  ```
+
+  Declaration is data; activation is code. The orchestrator owns game-flow
+  logic ("no more placements this turn" → disable the trigger), while the
+  trigger stays a dumb declarative mapping.
+
+### commands — atomic execution
+
+A command is an async function, the same shape as an orchestrator. It takes a
+`RunContext` (with its `args`), returns its result, and throws on error. The
+engine wraps it: it builds the context from the message, runs the function, and
+emits the result message — `:done` on resolve, `:cancel` on abort, `:error` on
+throw.
+
+```ts
+type Command<Args, Result> = (ctx: RunContext & { args: Args }) => Promise<Result>;
+```
+
+Commands are the **single mutation path** — the only way state changes.
+Triggers and orchestrators never mutate state directly; they emit command
+messages, and the command handlers execute them.
+
+## 5. run context
+
+Every handler runs against a `RunContext`, the handle to everything it can
+affect and the unit of cancellation.
+
+```ts
+interface RunContext {
+  signal: AbortSignal; // cancellation: superseded, skipped, surface disabled
+  emit(msg: Message): void;
+  wait(pred: (m: Message) => boolean): Promise<Message>; // rejects on abort
+  enableTrigger(type: string, id?: string): void;
+  disableTrigger(type: string, id?: string): void;
+}
+```
+
+- **Cancellation** is an `AbortSignal`. A superseded command or a disabled
+  surface aborts the signal; a `wait` rejects on abort, and the command's
+  `:cancel` result is emitted.
+- **Errors** are thrown. A command that throws emits `:error`; an orchestrator
+  that throws surfaces loudly.
+- Commands and orchestrators are the same shape: an async function taking the
+  context. An orchestrator is a command that returns `void` and is never
+  awaited by a parent.
+
+## 6. solo-only
+
+This design is **solo-only** — no multiplayer. Other players either don't
+exist or are automated with an automata. An automata is just another message
+consumer that emits commands: a stateful trigger or orchestrator. The engine
+doesn't care whether a `tap` message came from a human or a bot decision —
+same queue, same handlers. Solo-only simplifies the design: no network, no
+sync, no authoritative-server concerns. "Other players" are just more message
+producers.
+
+## Open decisions
+
+- **`main.ts` loading.** The host dynamically imports `main.ts`; the exact
+  loading boundary (Vite dynamic import, error handling, HMR) is deferred to
+  implementation. The engine defines the orchestrator type; the host loads the
+  module and hands the exported orchestrator to the engine.

docs/bgm/format.md

@@ -0,0 +1,557 @@
+# Board Game Manifest — Technical Reference
+
+> The concrete behavior of the board game manifest (bgm) format.
+>
+> Definitions can live in JSON/YAML/TOML files or in markdown code blocks. In
+> codeblock mode, each code block is a virtual definition file, named relative
+> to the current markdown file.
+
+---
+
+## 1. json features
+
+### The `$variants` directive
+
+For objects with a `$variants` key, the value is a CSV. Parse it into an object
+array with `typed-csv`, extend the original object with each row, and return
+the array.
+
+```yaml
+job: 'hero'
+$variants: ./heroes.csv
+```
+
+```csv
+name,parents
+string,string[]
+clark,[jonathan;martha]
+bruce,[]
+```
+
+```json
+[
+  { "job": "hero", "name": "clark", "parents": ["jonathan", "martha"] },
+  { "job": "hero", "name": "bruce", "parents": [] }
+]
+```
+
+### Inline vs file
+
+`$variants` can be a single source or an array of sources. Each source is a
+file/URL path if its first line ends in `.csv`, otherwise it is inline CSV.
+This keeps the two forms self-documenting and applies the same rule to single
+values and array elements alike. In YAML a block scalar (`|`) is the natural
+way to write inline CSV; in JSON you'd use `\n`.
+
+```yaml
+$variants: |
+  id,name,faceCrop
+  string,string,[number;number;number;number]
+  fish,Fish,[0;0;5;2]
+  grain,Grain,[1;0;5;2]
+```
+
+An array of sources concatenates their rows. This lets one part definition
+pull from several CSVs with different schemas — e.g. a deck where the regular
+cards share a face sheet but the jokers have their own:
+
+```yaml
+$variants:
+  - ./cards.csv
+  - ./jokers.csv
+```
+
+Each source is parsed with its own schema, and its rows extend the original
+object independently.
+
+### CSV conventions
+
+CSV is parsed with `typed-csv`:
+
+- The first row is the header, the second row is the type declaration
+  (`string`, `number`, `string[]`, ...), and the remaining rows are data.
+- Rows are validated against a zod schema derived from the type row.
+- **`crop` inside a CSV cell** uses `;` as the element separator
+  (`[0;0;5;2]`), because `,` is the CSV delimiter. `typed-csv` loads it into
+  an array with value `[0,0,5,2]`.
+
+---
+
+## 2. Definition discovery
+
+Definitions are organized in **packages**. A loader loads a package
+declaration, then uses its `include` paths to find the definitions.
+
+### Code blocks as virtual files
+
+A code block is a virtual definition file. Its name is derived from the
+`role=` on its info string — `role.type.lang` — so it is discoverable by the
+default `include: ./**/*.yaml` and addressable by that name:
+
+````md
+```yaml role=part.cargo
+...
+```
+
+```yaml role=surface.game#main
+...
+```
+
+```yaml role=package
+...
+```
+````
+
+- `role=part.cargo` names the block `part.cargo.yaml`.
+- `role=surface.game#main` names it `surface.game.yaml`.
+- `role=package` names it `package.yaml`.
+- The name is what `$variants: ./cargo.csv` and `include: parts/*.yaml`
+  resolve against. When there is a real file in that path, the codeblock wins.
+- `file=` overrides the auto-name when present, e.g. `file=parts/cargo.yaml`
+  names the block `parts/cargo.yaml` regardless of its role.
+- A block without `role=` is **not** a definition — it is ignored. Discovery
+  is explicit: a block is a definition only when its `role=` (or, for real
+  files, its filename) declares a known `role.type`.
+
+### role= on the info string
+
+A block's role is declared on the info string, using the same `role.type#id`
+shape as the block's identity. `type` and `id` are optional — anything not
+given comes from the content (or from `$variants` rows):
+
+````md
+```yaml role=part.cargo
+...
+```
+
+```yaml role=surface.game#main
+...
+```
+
+```yaml role=package
+...
+```
+````
+
+- `role=part.cargo` declares a part of type `cargo`; its `id` comes from the
+  content or from `$variants`.
+- `role=surface.game#main` declares a surface of type `game` with id `main`.
+- `role=package` declares a package; it has no type.
+- A `role`/`type`/`id` given on the info string **conflicts** with the same
+  key in the content and errors. `id` on the info string cannot combine with
+  `$variants`, since every row supplies its own `id`.
+- A block without `role=` is not a definition — discovery is explicit (see
+  above).
+
+### Real files
+
+A real `role.type.lang` file (e.g. `part.cargo.yaml`) is a definition by its
+filename, with no `role=` needed. `role` and `type` are parsed from the name;
+`id` comes from the content or `$variants`. A real file and a code block with
+the same name are the same definition; the code block wins.
+
+### Duplicates
+
+Two definitions with the same `role.type` are grouped under the same name.
+They must not define the same `id` — a duplicate `type#id` errors. Blocks with
+the same `role.type` but different ids are fine.
+
+### include
+
+`include` is a list of git-style path patterns — the defs that make up the
+package. **Defaults to `./**/*.yaml`**, so all yaml in the same and sub
+folders is discovered with no configuration. This also matches the package
+declaration itself, which is fine — it's the package, not a part.
+
+Patterns are resolved **relative to the package declaration's own directory**,
+not the games root. So a package declared in `carcassonne/carcassonne.md`
+with the default `./**/*.yaml` only picks up yaml under `carcassonne/` — it
+never absorbs defs from a sibling game. To reach outside its folder, a
+package can use a `../`-relative pattern or an absolute-from-root pattern
+(e.g. `**/shared/*.yaml`).
+
+---
+
+## 3. Roles
+
+json objects in yaml blocks are handled if they are declared as a definition
+by their `role=` (or, for real files, their filename) for either
+- `package`
+- `part`
+- `surface`
+- `setup`
+- `dialog`
+
+a valid object can either be the root or in the list of the yaml block.
+
+for all roles except package, `type` and `id` are needed.
+`type#id` is used for identification so that combo must be unique in the package.
+
+A block declares its role on the info string — `role=part.cargo` is equivalent
+to `role: part` + `type: cargo` in the content (see §2). A real file declares
+it in its filename. The info string/filename and content must not both set the
+same key.
+
+### package
+
+The package is the container for a game's definitions. It is declared with a
+`role: package` object:
+
+```yaml
+role: package
+id: harbor
+title: Harbor
+designer: Jane Doe
+players: 2
+language: en
+```
+
+- `role`: for block discovery.
+- `id`: package identification.
+- `title` — game name.
+- `include` — the defs that make up the package (see §2).
+- Optional metadata: `designer`, `development` (artist/developer), `publisher`,
+  `players` (player count), `language`.
+
+### part
+
+A part is a game component. It is identified by a `package:type#id` string,
+placed on the board via `setup`, and visualized by routes.
+
+#### part value types
+
+- `image` — a url to an image.
+- `crop` — a tuple `[col, row, cols, rows]`. Divides the image into a grid
+  and picks the cell at `[col, row]` with size `[width/cols, height/rows]`.
+  Negative `cols` flips the rendered image.
+- `size` — a tuple `[width, height, depth]` in mm units.
+
+#### part props
+
+- `face` — `sprite`. Used for texture.
+- `faceCrop` — `crop` for `face`.
+- `back` — `sprite`. Used for texture. Defaults to `face`.
+- `backCrop` — `crop` for `back`.
+- `shape` — `sprite`. Traced for its profile to create the mesh for the part.
+  Defaults to the full rect of the back image.
+- `size` — `size`. The token is scaled to fit in the box. The x/y aspect
+  ratio is kept, but not z (thickness).
+- `fillet` — number in mm. Used to fillet the shape. Defaults to `0`.
+- `facing` — the **physical affordance**: the facings the piece supports.
+  A card supports `[face, back, standing]`; a tile supports `[face, back]`.
+  Declares what's *possible*, not what's legal on a given zone (see `surface`
+  `layout`). Defaults to `[face]`.
+
+#### example
+
+```yaml
+role: part
+type: token
+id: wood
+face: ./assets/tokens.png
+faceCrop: [1, 0, 5, 2]
+back: ./assets/tokens.png
+backCrop: [3, 0, 5, 2]
+shape: ./assets/token-shape.png
+size: [20, 20, 3]
+fillet: 2
+```
+
+A `wood` token: the `face` and `back` sprites come from the same sheet,
+`faceCrop`/`backCrop` picking different cells of the `5×2` grid. The shape is
+traced from `token-shape.png`, sized `20×20×3` mm with a `2` mm fillet.
+
+### surface
+
+A `surface` is a **view** over the state store, purely for **visual rendering**.
+It has a reference `size` (`[width, height]` in mm) and a `layout` list of
+routes. The size is a reference — it may be scaled to fit larger or smaller
+tables. It does not affect part placement; placement lives in the state store
+(see §4). A surface need not cover every part — parts with no matching route on
+this surface are simply not shown.
+
+A surface also declares how it is **mounted**: as the root table surface, on a
+HUD area, or as a child of another surface. `mount` is always an object, with
+`x`, `y`, and `rotation` (defaulting to `0`) anchoring it like a route. The
+`kind` selects the mount type:
+
+- `table` — the root table surface (default).
+- `hud` — mounted to a HUD area, e.g. a player's hand.
+- `child` — mounted relative to a parent surface. A surface lists its
+  `children` (`type#id` refs) so a surface can be repeated, like a player
+  board; each child is mounted relative to its parent's anchor.
+
+```yaml
+type: board
+id: harbor
+role: surface
+size: [300, 200]
+mount:
+  kind: table
+  x: 0
+  y: 0
+  rotation: 0
+children:
+  - board#player
+layout:
+  - route: /dock/:seat
+    candidates:
+      $variants: ./seats.csv
+  - route: /deck
+    x: -100
+    y: 0
+    rotation: 0
+```
+
+```yaml
+type: hud
+id: hand
+role: surface
+size: [200, 100]
+mount:
+  kind: hud
+  area: bottom-left
+```
+
+```yaml
+type: board
+id: player
+role: surface
+size: [200, 200]
+mount:
+  kind: child
+  x: 100
+  y: 50
+  rotation: 0
+```
+
+### setup
+
+`setup` seeds the state store: the enabled surfaces and the part placement.
+Each valid game state is a valid setup.
+
+```yaml
+role: setup
+type: game
+id: main
+surfaces:
+  - board#harbor
+  - hud#hand
+setup:
+  - path: /dock/0
+    parts: harbor:boat#fleet
+  - path: /deck
+    parts: harbor:card
+    facing: back
+  - path: /table
+    parts: harbor:token#wood
+    facing: standing
+```
+
+`surfaces` lists the surfaces enabled at the start. A surface not listed is
+disabled and not rendered. When `surfaces` is omitted, all surfaces are
+enabled.
+
+`setup` is an **ordered list of placements**. Each placement moves its `parts`
+to its `path`, and entries are applied in order — so a part listed in a later
+placement ends up on that placement's path. This makes a setup read like "deal
+the deck, then move these cards to the flop".
+
+`parts` can be a single part id, a bare type without an id, or a list of
+either. A bare type expands to all parts of that type during game state
+initialization.
+
+`facing` sets how the placed parts are oriented on the board, defaulting to
+`face`:
+
+- `face` — lay flat, front up, resting on the bottom face.
+- `back` — lay flat, front down (flipped over), resting on the top face.
+- `standing` — stand upright on the bottom edge, front texture still showing.
+
+A part's `facing` is seeded into the game state and can change at runtime; it
+only affects orientation, never the part's texture.
+
+A setup also declares the **interaction affordances** — which dialogs are the
+tool for which open interactions on which paths:
+
+```yaml
+interactions:
+  - dialog: insert
+    on: [draw, grid]   # insertion uses the `insert` dialog on these paths
+  - dialog: shuffle    # open the shuffle dialog on any deck
+```
+
+`interactions` is a list of declarations: each names a `dialog` (a `role:
+dialog` definition, see below) and the paths it applies to (`on`, matching by
+path or by stack). It declares the *interaction surface*, not the legality of
+the resulting command — rule scripts (later) gate legality. A dialog can be
+opened by a player gesture or pushed by a rule script; only the trigger differs.
+
+### dialog
+
+A `dialog` is declarative content shown in the layer-3 shell. Opening and
+closing it never issues a command or mutates state; it is pure UI. Its **action
+buttons** issue commands — the bridge between the dialog and the rule seam.
+
+```yaml
+role: dialog
+type: prompt
+id: discard
+title: Choose a card to discard
+body: |
+  Select a card from your hand.
+actions:
+  - label: Confirm
+    command: { move: { part: "#chosen", to: /discard } }
+widget: stack   # a stack-of-parts content type
+```
+
+A dialog's content is a **title**, **body**, **action buttons**, and an optional
+`widget`. Supported content types include a **stack of parts** — an ordered,
+scrolled view of a path's stack with an insertion cursor — which is what powers
+insertion and shuffling dialogs against the state store.
+
+`dialog` is a same-shaped definition as the others: `type`/`id` identify it
+(`type#id` unique in the package), and it collides-checks like `part`/`setup`.
+
+---
+
+## 4. Concepts
+
+### Game state
+
+The board's state is a **state store**: the set of **enabled surfaces** and a
+map from path to a **stack** of parts. It is the authoritative record of which
+surfaces are in play and where every part is placed.
+
+A path is a URL path with named params, like `/dock/1`.
+
+A part is identified by a `package:type#id` string.
+
+A surface is enabled or disabled; a disabled surface is not rendered. Setup
+seeds the enabled set (see §3), and it changes at runtime as the game
+progresses (e.g. enabling the main board after an expansion-chooser scene).
+
+Dialogs are **not** part of the state store. The dialog stack is UI state
+hosted by the shell; opening/closing a dialog never mutates the store. A dialog's
+action buttons issue commands (see `role: dialog` §3), which is the one-way
+bridge onto the state.
+
+### Routing
+
+A route is a **visualization route**: it maps a part to a location on a
+surface. Routes match the keys of the state store, but they are defined by a
+surface and need not cover every placed part — a part with no matching route on
+a given surface is simply not shown there. Routes exist only for game parts; a
+surface is not a part and never appears on a route.
+
+A route matches all parts on the path; the placement of each individual part on
+the stack is a separate concern.
+
+A route is an express-style URL path with named params, plus the `x`, `y`, and
+`rotation` of its anchor. Routes are defined in a **list**, not a map, so the
+same route path may appear more than once:
+
+A route may also declare a zone `facing` — the **legal facing** on that zone.
+This constrains what the placed parts may be, independent of each part's
+physical affordance (see `part` `facing`). A state is legal only when the part's
+facing is in both the part's affordance *and* the zone's legal set. When omitted,
+the zone is unrestricted beyond the part's affordance. An MTG discard pile
+requires `[face]`; a play area allows `[face, tap]`; a facedown deck requires
+`[back]`. The same card is face-up in the discard but tapped in play — the
+piece's affordance is unchanged, only the zone's rule differs.
+
+```yaml
+layout:
+  - route: /dock/:seat
+    x: 40
+    y: 0
+    rotation: 0
+  - route: /deck
+    x: -100
+    y: 0
+    rotation: 0
+```
+
+### Candidates
+
+To match a class of routes against a list of positions, keep a single route with its param and give it a
+`candidates` array to match `:param` against, each candidate carrying its own `x`/`y`/`rotation`:
+
+```yaml
+layout:
+  - route: /dock/:seat
+    candidates:
+      $variants: ./seats.csv
+```
+
+```csv
+seat,x,y,rotation
+string,number,number,number
+0,40,0,0
+1,40,20,0
+```
+
+The router should select only the first candidate with all params matched against its props — the fields in the candidate's CSV row (e.g. `:seat` matches the candidate's `seat` value).
+
+A candidate inherits the route's `x`, `y`, `rotation`, and `stacking`, and may override any of them with its own values. When no candidates match, the whole route fails to match.
+
+### Stacking
+
+When multiple parts live on a path, only the top (last) one shows by default.
+To override this, add stacking strategies:
+
+```yaml
+layout:
+  - route: /deck
+    x: -100
+    y: 0
+    rotation: 0
+    stacking:
+      curve: M 0 0 C 20 -20 40 -20 60 0
+      limit: 5
+      align: center
+      steps: 4
+      tilt: 0.1
+      zStart: 0
+      zEnd: 30
+```
+
+- `curve` — an SVG path string to spread the content along, relative to the
+  anchor `x`, `y`, `rotation`.
+- `limit` — how many parts to display. `0` shows all, `3` shows the first 3,
+  `-3` shows the last 3.
+- `align` — `start`, `end`, or `center` of the curve.
+- `steps` — the maximum number of parts per curve length unit. Defaults to
+  `1`. See the positioning process below.
+- `tilt` — rotation in degrees applied to every shown part about the card's
+  local Y (long) axis. It applies even without a `curve`, so a bare `tilt`
+  rotates a straight pile. Defaults to `1` when not specified.
+- `zStart` / `zEnd` — the height (surface-normal) in mm at the start and end
+  of the `curve`. The stack ramps linearly between them across its span,
+  lifting it in 3D. Requires a `curve`.
+
+#### positioning process
+
+1. **Determine the step length.** It is `curve length / max(steps, # of
+   parts on path − 1)`.
+2. **Determine the alignment.** It places the span of
+   `step length × (# of parts − 1)` on the curve.
+3. **Place each part.** Part `#0` is at the start, the last part at the end,
+   each `step length` apart.
+4. **Lift each part.** The part's height is `zStart + (zEnd − zStart) × u`,
+   where `u` is its normalized position along the `curve`.
+5. **Tilt each part.** Every part is rotated `tilt` about its local Y (long)
+   axis.
+
+### Edge cases
+
+- Object with no matching route → **not placed on this surface**. The game
+  state is still valid — the part simply isn't visualized. A surface is a view
+  over the state store, not a mirror of it, and may show only a subset (e.g. a
+  player's hand on the HUD).
+- Route with no matching object → empty, fine.
+- Multiple routes match one path -> first route wins.
+- Multiple parts on one path → **stack** (see §4 Stacking). One route wins
+  for all parts on a path, and the stacking strategy decides what's shown
+  (it may drop parts that are not dropped on other matching routes).

docs/bgm/interactions.md

@@ -0,0 +1,134 @@
+# bgm Interactions
+
+The free-interaction layer (layer 3 of the layering) — how a player interacts
+with a bgm game that has no rules yet: a sandbox. It builds on the state model:
+see [`state-model.md`](./state-model.md) for components-vs-setup, path→stack ×
+facing, and the anchoring scope.
+
+> **Status:** Implemented (layer 3, sandbox). The operation set, the
+> command/dialog split, and the deck-pick-up dialog are built in
+> `@tts/tabletop` (`interactions.ts`, `dialog.tsx`). Rule-enforced play (layer
+> 4) is not yet wired — the rule seam is a no-op filter over free interaction.
+
+## 1. The operation set is closed and tiny
+
+Two assumptions from the state model do most of the work:
+
+1. **Parts are never created or destroyed** — the set of parts is fixed (the
+   setup's parts).
+2. **State is only path, stack, and facing** — there is nowhere to store a free
+   position in space.
+
+Together they collapse the *entire* space of free interaction into three
+operations:
+
+1. **`move(id, path, index?)`** — relocate a part to a path, at a stack
+   position (default: top of stack).
+2. **`setFacing(id, facing)`** — change facing, within the part's physical
+   affordance.
+3. **reorder** — a `move` with an explicit `index`.
+
+That's it. There is no arbitrary positioning and no free placement in 3D because
+the state model has nowhere to store one. "Free" means *unconstrained over these
+three operations*, not "free in space."
+
+## 2. Free interaction and rule play are the same operations
+
+This is the payoff. Rule-enforced play (layer 4) is **the same three
+operations, gated by a legality check**:
+
+- The interaction layer produces an **intent** — "player wants
+  `move(card, /discard)`."
+- **Sandbox mode**: apply it directly.
+- **Rule mode**: validate the intent against the setup's shape + the rule script
+  first; reject if illegal.
+
+So the rule engine needs no interaction vocabulary of its own — it is a **filter
+over free interaction**. `move`/`setFacing` are the shared primitives; rules
+decide which are legal in the current state. Drag-and-drop and a scripted move
+both funnel through the same store mutation. That is the seam between layer 3
+and layer 4.
+
+## 3. Commands vs the dialog stack
+
+There are two channels, and they do not mix:
+
+- **Commands** — intent to *change state* (`move`, `setFacing`). They go through
+  the rule seam and mutate the store.
+- **The dialog stack** — transient UI contexts (the deck pick-up, a "confirm
+  discard," a hint prompt). Opening/closing a dialog **never issues a command**
+  and never touches state; it is pure UI.
+
+This simplifies the model. The dialog stack is **UI state, hosted by the layer-3
+shell, not by the game-state store** — dialogs don't belong in path/stack/facing.
+
+How they connect — one direction only:
+
+- **Player-initiated**: a click on a deck pushes the deck dialog; the dialog's
+  insert button issues a `move` command.
+- **Script-initiated**: a rule script pushes the same dialog (e.g. to force a
+  discard) and awaits the player's `move` through it. The script's open/close
+  is tied to the dialog stack; it can `pushDialog`/`popDialog` without mutating
+  game state.
+
+So the deck dialog is **one implementation, driven either way** — by a player
+click or by a rule script. Only the *trigger* differs.
+
+Dialogs are **authored in the manifest**, not hardcoded. A `role: dialog`
+definition declares the title, body, action buttons, and an optional widget
+(a stack of parts). Setups declare which dialogs are the tool for which
+interactions via `interactions:` (see [`format.md`](./format.md) §3). The
+rule seam stays clean because a dialog's buttons issue commands while its
+open/close is stack-only.
+
+## 4. Compound interactions: the deck pick-up dialog
+
+A dialog is where compound, multi-step manipulation lives, because it owns the
+transient sub-state that the store must not. The prime example — inserting a
+card into the middle of a deck:
+
+1. pick up the deck
+2. scroll through it to find the place
+3. insert the card at the cursor
+4. put the deck back
+
+(even 0: put down your held hand of cards first).
+
+The dialog is an **alternate view of the stack**: the deck is "lifted" off the
+table into the dialog (it stays on its path; the rest of the table becomes
+backdrop). Its contents are shown **in order**, with an **insertion cursor**
+between cards that you scroll. The cursor *is* the index: `move(id, path,
+index)`'s index is discovered by scrolling the visible deck, not typed.
+
+This is a real interaction *mode*, owned by the dialog:
+
+- The scroll position is state.
+- Everything else pauses while it's open (or the held part is kept visible).
+- It only exists for **stacks**; single parts just snap onto a path.
+
+We treat it as a **reusable pattern** — a stack-inspector dialog — not a one-off
+hack for one command, so `deal`, `draw`, and `look-at-the-top` can reuse the
+same lifted-deck view.
+
+## 5. The primitives map to concrete gestures
+
+- **Move** — pick up a part → it leaves its stack (transient "in hand"); drag →
+  resolve the nearest path anchor within a threshold; drop → `move` (drop on
+  nothing returns to origin).
+- **Facing** — click cycles the part through its physical affordance
+  (`face → back → standing`, or the declared list).
+- **Reorder / insert** — the deck dialog above.
+
+The "in hand" state is transient and illegal, so it lives **outside the store**
+(a UI-level held part); only the committed outcome (drop) mutates the store.
+
+## Open questions
+
+- **Held source for insertion** — single held card (fits the physical model; the
+  dialog inserts it at the cursor), vs the dialog owns the source (you cursor a
+  card *from* the deck to lift). Lean single-held-card, but confirm it doesn't
+  fight the hand step.
+- **Multi-part ops** — picking up a whole stack, dealing N cards. Deferred; the
+  single-part primitives are the foundation.
+- **Scroll window** — a window over a subset of the deck can return with the
+  cursor's scroll position; exact widget is a render concern, not a state one.

docs/bgm/state-model.md

@@ -0,0 +1,137 @@
+# bgm State Model
+
+The format's model of what a board game *is*, and the shape of the states it can
+be in. This is the organizing model behind the concrete specs:
+[`format.md`](./format.md) (the manifest), [`tabletop.md`](./tabletop.md) (the
+render library), and [`engine.md`](./engine.md) / [`commands.md`](./commands.md)
+(scripted interaction).
+
+> **Status:** Design. The loader and render layer implement components and a
+> static setup today; the state-shape framing, zone-facing, and the anchoring
+> scope cut below are proposals to guide the next phase.
+
+## 1. Components are constants; setup is the shape of states
+
+A bgm game is authored two ways, and they answer different questions:
+
+- **Components** (`part`, `surface`) describe the **constants** — the physical
+  pieces and the board geometry that do not change during play. A tile is a
+  45×45 mm square with a meadow/road/city face; the play board has a draw pile
+  and an 11×11 grid. These are timeless facts about the game, not state.
+- **setup** describes the **shape of the game's states** — which parts can be
+  where, how many, and with what facing. It is a *schema* over the state space,
+  not a concrete snapshot of one run.
+
+The runtime store is then an **instance** of the setup's shape: the current
+state of play, a point in the state space the setup describes. This buys three
+things:
+
+- **Validation** — a state is legal iff it matches the setup's shape (on the
+  right paths, right counts, right facing).
+- **A contract for the rule engine** — legal play is a *transition between
+  shapes*; the rule layer (layer 4 in the layering vision) reasons over them.
+- **A clean boundary** — components are timeless; setup is the state space; the
+  store is the current point.
+
+### Open: does setup carry the initial state?
+
+A game needs a concrete starting position, not just a schema. The default is
+that a `setup` is **shape + initial instance** — one role that both describes
+the legal state space and seeds the store. The alternative (schema-only, with
+the initial state derived from the shape) is explored but not preferred.
+
+## 2. The state: path → stack × facing
+
+The state space is made of two axes.
+
+### Path → stack
+
+Every part lives on a **path** (a URL-style key like `/grid/5/5` or `/draw`),
+and multiple parts on a path form an ordered **stack** (a deck, a pile of meeples,
+a tile with a meeple on it). Placement is one axis. This is already in use.
+
+### facing — part affordance × zone restriction
+
+Facing is the second axis, and it has two distinct sources of constraint:
+
+- **The part** declares the **physical affordance** — the facings the piece
+  physically supports. A card supports face/back/standing; a tile supports
+  face/back but not "tapped".
+- **The path (zone)** declares the **legal facing** — what's allowed on that
+  zone. An MTG discard pile requires face-up; a play area allows tapped; a
+  facedown deck requires face-down. The same card is face-up in the discard,
+  tapped in play, face-up in exile — the piece's affordance doesn't change, only
+  the zone's rule does.
+
+A state's facing is legal iff it is **both physically possible (part) and
+zone-legal (path)** — the effective set is the intersection.
+
+```yaml
+role: part
+type: card
+id: basic
+facing: [face, back, standing]   # physical affordance
+
+role: surface
+type: board
+id: main
+layout:
+  - route: /discard
+    facing: [face]               # zone restriction
+  - route: /play
+    facing: [face, tap]          # zone restriction
+```
+
+Deck / the current facing lives in the store and must be in the intersection.
+
+### Open questions
+
+- **Default when a path declares no `facing`** — unrestricted (only the part's
+  affordance bounds it), or a sensible default like `face`? Lean unrestricted.
+- **Is "tapped" a facing or a rotation?** In MTG it's a 90° in-plane rotation.
+  Default: fold common rotations into the facing enum (`face` / `back` /
+  `standing` / `tap`) for schema simplicity; arbitrary rotation is a later
+  extension.
+- **Naming** — the part-side and path-side are different constraints wearing the
+  same word. Worth distinct terms (capability/typ) so they don't collide.
+
+## 3. Anchoring scope: stacks-on-paths, not part-to-part networks
+
+Real TTS mods anchor components to each other — a meeple on a tile, a fanned
+hand, tokens scattered on a board. We are **not** modeling part-aligned-to-part
+relative placement networks. Instead:
+
+- **Stacks absorb part-on-part.** "Meeple on tile" is a stack `[tile, meeple]`
+  on a path. Much of TTS's anchoring collapses into the path→stack model.
+- **Free relative placement is out of scope** — a meeple at an offset on a tile,
+  a fanned hand, arbitrary token scatter are not modeled.
+
+This is a deliberate scope cut. It keeps the state model closed and simple, but
+it is a **fidelity loss for converted games** and part of the "with some fixing"
+cost of the TTS→bgm conversion. Components (layer 1), not the state model, are
+the place to extend later if needed.
+
+### The grid compromise
+
+Because we don't model parts-aligned-to-parts, common layouts are expressed
+explicitly — and grid layouts become verbose (the Carcassonne board is 121
+hand-written row coordinates in `grid.csv`). The mitigations:
+
+- **Grid shorthand** — a declarative `grid` (cols/rows, cell size, origin) that
+  expands to routes, instead of authored coordinates.
+- **Free-placement shorthand** — a `free`/scatter mode for loose collections,
+  when the exact positions don't matter to play.
+
+But there is **no general part-to-part network** on the roadmap. If a converted
+game needs it, that is a format extension to design deliberately, not an
+implicit assumption.
+
+## Summary
+
+| Concept | Role | Where |
+| --- | --- | --- |
+| Components | Constants — the physical pieces & board geometry | `part`, `surface` |
+| Setup | The shape of the state space (+ initial instance) | `setup` |
+| Store | The current state, an instance of the setup | `@tts/tabletop` |
+| Facing | Part affordance × zone restriction | part + path/zone restriction |
+| Anchoring | Stacks-on-paths only; no part networks | — |

docs/bgm/tabletop.md

@@ -0,0 +1,69 @@
+# bgm-tabletop
+
+> **Status:** Implemented (items 1–8 of the plan). A few features below are
+> designed but not yet wired (commands, HUD rendering); see §5 and
+> [`../status/bgm-tabletop.md`](../status/bgm-tabletop.md).
+
+An r3f-based interactive component library for working with [bgm](./format.md)
+board games. It is used in the `web` app's bgm inspector routes.
+
+## 1. stack
+
+`react` - react, react router, tailwind v4
+`r3f` - r3f, drei, postprocessing
+`zustand` - for state management
+
+## 2. states
+
+source-of-truth game state:
+
+```ts
+{
+  surfaces: Record<string, boolean>, // enabled per surface id
+  parts: Record<string, PartState>,  // part id -> placement state
+}
+
+interface PartState {
+  path: string,  // the path key this part is on
+  index: number, // the part's position in its path's stack
+  facing: 'face' | 'back' | 'standing', // how the part is oriented on the board
+}
+```
+
+**assumption:** each piece on the board has a unique id, even tokens of the same type. so a part id appears at most once, and a path's ordered children (for stacking) are derived from the map by sorting on `index`. this makes the render list keyed by piece id stable and unambiguous.
+
+derived surface render state: game state + surface routes => map of piece id to `{ surface, route, candidate, index, stackSize, facing }` for rendering on a surface. keys of this map makes a stable render list.
+
+- `route` - the matched route.
+- `candidate` - the matched candidate for a `:param` route, carrying its anchor `x`/`y`/`rotation`. absent for routes without candidates.
+- `index` - the piece's position in its path's stack.
+- `stackSize` - the number of pieces on the path.
+- `facing` - how the piece is oriented on the board (`face` / `back` / `standing`).
+
+the render map is per enabled surface: a piece may appear on more than one enabled surface (e.g. an expansion path and the main board), and each is rendered independently.
+
+## 3. components
+
+- `SetupLoader` side effect only component that seeds the game state with setup (enabled surfaces + part placement).
+- `WorldSurfaceView` mounts a surface to world space.
+- `HudSurfaceView` mounts a surface to hud space.
+- `PartPlacement` a stable per-part component that positions a part on a surface location. uses the stacking hook (below) to apply the route's stacking strategy.
+- `PartView` used in `PartPlacement`, creates a mesh from part definition. a standalone component library, so it reuses geometry/shape code from `@tts/mesh` rather than the web app's viewers.
+
+## 4. stacking
+
+the format's stacking strategy (`curve` / `limit` / `align` / `steps` / `tilt` / `zStart` / `zEnd`, see `format.md` §4) is implemented as a hook, e.g. `useStacking(route.stacking, index, stackSize)`, returning the offset/rotation to apply to a piece: `{ x, y, rotation, z, tilt }`. `x`/`y`/`rotation` come from the `curve`; `z` is the surface-normal height ramped from `zStart` to `zEnd`; `tilt` is the rotation about the card's local Y (long) axis, applied to every part. `PartPlacement` consumes it.
+
+## 5. commands
+
+Scripted interaction — focus, tap-to-advance, move, caption — is built on an
+async command layer. See [`commands.md`](./commands.md) for command
+execution (lifecycle, run contexts, tap interaction), and
+[`engine.md`](./engine.md) for the message layer above it (the queue,
+triggers, and orchestrators that declare and fire commands).
+
+## 6. usage
+
+- we will inspect individual parts with `PartView` in the web app's part inspection route.
+- as a library, the public surface is the components above: mount a surface with `WorldSurfaceView`/`HudSurfaceView`, seed state with `SetupLoader`, and let `PartPlacement`/`PartView` render the pieces. the web app is one consumer; the library should not assume the web app's routes or store.
+- a surface is mounted only when enabled; a disabled surface is not rendered.

docs/decisions.md

@@ -2,7 +2,7 @@
 
 > **Scope:** The rationale behind key design decisions. For the system's
 > architecture, see [`architecture.md`](./architecture.md). For the concrete
-> build plan, see [`implementation-plan.md`](./implementation-plan.md).
+> build plan, see [`status/implementation-plan.md`](./status/implementation-plan.md).
 >
 > Each entry records the decision, the context, and the alternatives considered.
 > New entries are appended; existing entries are updated only to correct facts,
@@ -259,4 +259,68 @@ boundary.
 **Alternatives considered:** A polling `CameraFit` that waited for non-empty
 bounds each frame; hand-rolled camera math. Rejected — Suspense already
 signals content readiness, so `Bounds` inside the boundary fits the loaded
-geometry directly.
+geometry directly.
+
+## D19 — Commands are async with ok/cancel/error results
+
+**Decision:** Scripted interaction is built on async commands. Each command
+returns `ok`, `cancel` (interrupted — superseded, skipped, surface disabled),
+or `error` (genuinely failed). Each invocation gets its own run context — the
+unit of cancellation and the carrier of command state. Commands are either
+fire-and-forget (the runtime doesn't await them) or self-managed waiting (they
+resolve their own promise when a condition is met); both get a run context and
+cancel path. Supersede groups cancel a running command when another in the
+group starts (e.g. a `camera` group so a second focus cancels the first).
+
+**Context:** The user wants to script interaction sequences — focus, caption,
+title, highlight, tap-to-advance, move, camera away. The state store and
+render layer already exist; what's missing is a way to drive them over time
+and react to input. Design: [`bgm/commands.md`](./bgm/commands.md).
+
+**Alternatives considered:** A single monolithic script interpreter. Rejected
+— commands as self-contained async units are testable in isolation and let
+the runtime stay a thin orchestrator.
+
+## D20 — Tap interaction reports every tap with the nearest trigger point
+
+**Decision:** Only tap interaction is supported. A tap on a part is reported
+to the command layer as a `TapEvent` carrying the part, the tap position in
+the part's local frame, and the nearest trigger point within its `radius` (or
+`null` on a miss). Trigger points are authored in the part's local frame with
+mm radius; distance is measured in the part's plane; ties go to the first
+declared. The command decides how to react to a miss — resolve, reject, or
+ignore.
+
+**Context:** Commands need to wait on player input (`wait: tap`). Reporting
+every tap with the nearest trigger point keeps the runtime dumb and lets the
+command own the UX (e.g. a "wrong spot" shake). Authoring trigger points in
+the part's local frame keeps them valid as the part moves, rotates, and
+flips.
+
+**Alternatives considered:** Reporting only a hit and silently dropping
+misses. Rejected — a command that needs to react to a wrong tap has no way to
+do so. World-space trigger points. Rejected — they break when the part moves.
+
+## D21 — Card sprite UVs live in the material shader, not the texture
+
+**Decision:** A card's sprite cell is selected by a repeat/offset injected into
+the material's shader (`cardMaterial.ts` extends `MeshStandardMaterial` via
+`onBeforeCompile`) rather than by cloning the texture and setting its
+`repeat`/`offset`.
+
+**Context:** Cards in a deck share one sprite sheet (drei caches the texture by
+URL), but each card samples a different cell. The previous approach cloned the
+texture per card to set its UVs; each clone gets its own WebGL texture binding,
+so navigating a deck re-uploaded the whole sheet on every step. Moving the
+transform into a per-material uniform lets cards share the texture (one GPU
+upload), the shader (identical injected source → one program), and the geometry,
+with only the material uniforms differing.
+
+We inject our own uniform rather than setting `texture.repeat`/`offset` because
+three r185 derives map UVs from a `mapTransform` matrix refreshed from
+`map.matrix` every frame, which would overwrite a per-material transform set on
+the shared texture.
+
+**Alternatives considered:** Cloning the texture per card (previous approach).
+Rejected — re-uploads the sheet per card. A module-level cache of per-card
+clones. Rejected — still one upload per unique card instead of one per sheet.

docs/overview.md

@@ -0,0 +1,27 @@
+# Docs
+
+The documentation is split into the living specs, which describe how the
+system works today, and the status/plans, which track development iterations
+and go stale as work lands.
+
+## Specs — how the system works
+
+| Doc | Covers |
+| --- | --- |
+| [`architecture.md`](./architecture.md) | System architecture and the package dependency graph |
+| [`decisions.md`](./decisions.md) | Key design decisions and the rationale behind them |
+| [`bgm/format.md`](./bgm/format.md) | The board game manifest (bgm) format spec |
+| [`bgm/engine.md`](./bgm/engine.md) | The bgm message layer: queue, triggers, orchestrators |
+| [`bgm/commands.md`](./bgm/commands.md) | bgm command execution: lifecycle, run contexts, tap interaction |
+| [`bgm/tabletop.md`](./bgm/tabletop.md) | The r3f tabletop component library |
+| [`bgm/state-model.md`](./bgm/state-model.md) | The format's state model: components vs setup, facing, anchoring scope |
+| [`bgm/interactions.md`](./bgm/interactions.md) | Free interaction: the operation set, the rule seam, and the deck pick-up dialog |
+
+## Status & plans (dev logs)
+
+| Doc | Covers |
+| --- | --- |
+| [`status/implementation-plan.md`](./status/implementation-plan.md) | Original build plan |
+| [`status/bgm-loader.md`](./status/bgm-loader.md) | bgm loader — what's built, works, missing |
+| [`status/bgm-tabletop.md`](./status/bgm-tabletop.md) | bgm tabletop — implementation plan / status |
+| [`status/full-setup-view.md`](./status/full-setup-view.md) | Full-setup view plan |

docs/status/bgm-loader.md

@@ -0,0 +1,75 @@
+# bgm Loader — Status
+
+> Status: current. What's built, what works, what's missing, and the known
+> issues. Spec: [`../bgm/format.md`](../bgm/format.md).
+
+## What's built
+
+### `packages/bgm` — the loader core (new)
+
+| File | Purpose |
+| --- | --- |
+| `src/types.ts` | Roles (`Package`, `Part`, `Surface`, `Setup`, `Route`, `Stacking`, `SurfaceMount`, …), `SerializedPackage` (the JSON the plugin emits), `BgmError`, `DefFile`, `ParsedDef` |
+| `src/schemas.ts` | zod schemas + `validate*` for each role |
+| `src/markdown.ts` | Virtual def files from markdown code blocks, via **`marked`**. `file=` naming + content-hash auto-naming (`./<hash>.yaml`); multiple blocks may share a `file=` name |
+| `src/parse.ts` | yaml/json/toml → def objects (`yaml`, `smol-toml`); real-file walker (incl. `.csv`) |
+| `src/variants.ts` | `$variants` expansion via **`typed-csv`** (`typed-csv/csv-loader`). Inline (newline) vs path; paths resolve against the virtual def map |
+| `src/collect.ts` | `loadDefs` (real + virtual, virtual wins), `collectPackages` (package decl → `include` globs via **picomatch** → parts/surfaces/setups, `type#id` uniqueness, `$variants` on defs and route candidates). Sets each part's `baseUrl` to its source file's directory for resolving relative asset paths |
+| `src/vite.ts` | The **vite plugin** (`bgm()`): resolves `virtual:bgm/packages` (all packages) and `virtual:bgm/package/<id>` (one package) imports to `export default <json>`, watches source files for reload. Serializes the package's `Map`s to objects (`SerializedPackage`); throws on unknown packages; re-collects per `load` (no stale cache). |
+| `src/*.test.ts` | **23 tests, all passing** — markdown extractor, typed-csv parsing (incl. the spec's empty-array + crop tuple cases), full harbor collection, plugin unit tests (resolve/load/shape/watch), and a real `vite build` integration test covering two packages |
+
+Deps: `marked`, `typed-csv`, `yaml`, `smol-toml`, `picomatch`, `zod`, `vite`, `@types/picomatch`.
+
+### Example game: harbor (fixture)
+
+Exercises the format end-to-end: package decl, two `file=parts/tokens.yaml` blocks, a table surface with `mount`/`children` and `candidates: $variants` against a virtual csv block, a child player surface, and a setup declaring its enabled `surfaces`. Lives as the vitest fixture under `packages/bgm/src/__fixtures__/harbor/` (and a copy under `packages/tabletop/src/__fixtures__/vite-build/games/harbor/`).
+
+### `games/poker/poker.md` — example game (new)
+
+A real 52-card deck: a single `card` part expanded by `$variants` into 52 cards, each picking a cell from a `13×4` face sheet (`cards-13x4.jpg`) and a shared `4×1` back sheet (`back-4x1.png`). Assets are stored in Git LFS (`.gitattributes`).
+
+### `packages/tabletop` — rendering library (new)
+
+A standalone r3f library that renders bgm parts. `PartView`/`PartMesh` build a mesh from a `Part` definition via `@tts/mesh` (size/fillet, face/back sprite UVs, traced `shape` or rect fallback). Proxy calls (`/asset`, `/trace`) default to `@tts/http` handlers and are overridable via `TabletopProvider`. Plan: [`bgm-tabletop.md`](./bgm-tabletop.md).
+
+### `packages/http` — shared proxy HTTP (new)
+
+CORS-safe proxy HTTP helpers shared by the web app and `@tts/tabletop`: `assetUrl`/`resolveAssetUrl` (route external assets through `/asset`) and `traceImage` (image → vector shape via `/trace`, BSON-deserialized). The trace-to-shape geometry conversion lives in `@tts/mesh` (`traceToShape`/`traceToUvBounds`), and `ErrorBoundary` is shared via `@tts/tabletop`.
+
+### `apps/proxy` — local game assets (new)
+
+The proxy serves local game assets from the `games` root: `GAMES_ROOT` (env or default) is set at startup (`config.ts`) and read by the `/asset` and `/trace` routes to serve relative paths (e.g. `poker/parts/assets/cards.png`) from disk, alongside the existing http(s) proxy path.
+
+### `apps/web` — consumer (new)
+
+- `vite.config.ts` — wired with `bgm({ root: <repo>/games })`, importing the plugin from `@tts/bgm`.
+- `src/vite-env.d.ts` — ambient `declare module 'virtual:bgm/packages'` (all packages) and `'virtual:bgm/package/*'` (one package).
+- `src/pages/BgmPage.tsx` — list page: imports `virtual:bgm/packages` and shows every discovered package. Routed at `/bgm`.
+- `src/pages/BgmPackagePage.tsx` — detail page: looks up a package by id from `bgm` and renders its parts/surfaces/setups. Routed at `/bgm/:id`.
+
+The vite plugin itself lives in `packages/bgm/src/vite.ts` (exported from `@tts/bgm`), not in the web app — so the loader's plugin is tested in isolation from the web project.
+
+## Works
+
+- `pnpm --filter @tts/bgm build` and `typecheck` pass.
+- Root `pnpm test`: **191 pass**.
+- `pnpm --filter @tts/web build` succeeds; config warnings fixed.
+- `src/vite.test.ts` runs a **real `vite build`** against a self-contained fixture (`src/__fixtures__/vite-build/`) and asserts the bundled output contains the package data — the plugin is proven end-to-end without touching the web app.
+- `pnpm --filter @tts/tabletop build` / `test` pass; `pnpm --filter @tts/proxy typecheck` passes.
+
+## Known issues
+
+1. ~~Plugin emits empty maps~~ — fixed: `load` serializes `Map`s via `Object.fromEntries`.
+2. ~~Plugin `load` uses `this.error`~~ — fixed: throws instead.
+3. ~~HMR cache not invalidated~~ — fixed: dropped the closure cache; re-collects per `load`.
+4. ~~`tinyglobby` leftover dep~~ — removed.
+5. ~~Package-level test script finds no files~~ — added `packages/bgm/vitest.config.ts`.
+
+## Not yet done
+
+- ~~No consumer yet~~ — `apps/web/src/pages/BgmPage.tsx` lists packages from `virtual:bgm/packages`; `BgmPackagePage.tsx` shows one at `/bgm/:id`.
+- **`$variants` URL paths** — spec mentions file/URL; URLs deferred.
+- **zod `SerializedPackage` shape for the emitted JSON** — the plugin emits `SerializedPackage` objects; a zod schema for the emitted module would give runtime validation beyond the ambient `declare module`.
+- **`setup` value expansion** — `type` without `id` → all parts of that type is documented but not implemented in the loader (it's a game-state init concern; noted as future).
+- **Surface mounting is validated but not resolved** — `mount`/`children`/`surfaces` are parsed and validated, but the loader doesn't resolve child→parent relationships or enforce that a setup's `surfaces`/a surface's `children` reference existing surfaces. That's a game-state/rendering concern (see `../bgm/tabletop.md`).
+- Docs for the loader itself (this file is the start).

docs/status/bgm-tabletop.md

@@ -0,0 +1,215 @@
+# bgm-tabletop — Implementation Plan / Status
+
+> **Scope:** A standalone r3f component library that renders
+> [bgm](../bgm/format.md) board games: a state store, surface mounting, part
+> placement with stacking, and per-part meshes. Design:
+> [`../bgm/tabletop.md`](../bgm/tabletop.md).
+> **Status:** items 1–8 implemented and the full tabletop scene is wired into
+> the web app's setup detail route (`/bgm/:id/setups/:type/:setup`). The
+> part-inspection route renders `PartView` from the library.
+
+## Goal
+
+A library (new `packages/tabletop`) that takes a bgm package and renders it as
+an interactive 3D table: enabled surfaces mounted in world/HUD space, parts
+placed on their routes, stacked per the format's stacking strategy. The web
+app's bgm inspector routes are one consumer; the library must not depend on the
+web app.
+
+## Stack
+
+`react`, `react-router` (types only), `tailwind` (styles only), `r3f`
+(`@react-three/fiber`), `drei`, `postprocessing`, `zustand`, `three`,
+`@tts/bgm` (types), `@tts/mesh` (geometry).
+
+## Package layout
+
+```
+packages/tabletop/
+  package.json            # @tts/tabletop
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts              # public exports
+    state.ts              # zustand store + derived render state
+    setup.ts              # SetupLoader: seed state from a setup
+    mount.ts              # resolve surface mount tree (table/hud/child)
+    stacking.ts           # useStacking hook
+    placement.ts          # PartPlacement
+    partView.tsx          # PartView: mesh from a part definition
+    surfaces/
+      WorldSurfaceView.tsx
+      HudSurfaceView.tsx
+    *.test.ts             # colocated unit tests
+```
+
+## Work items
+
+### 1. Package scaffold ✅
+
+- New `packages/tabletop` workspace package (`pnpm-workspace.yaml` already
+  globs `packages/*`).
+- Deps: `@tts/bgm`, `@tts/mesh`, `three`, `@react-three/fiber`, `@react-three/drei`,
+  `@react-three/postprocessing`, `zustand`. Dev: `vitest`, `typescript`,
+  `@types/three`.
+- `tsconfig.json` mirroring `packages/bgm`'s (strict, ESM, `dist` output).
+
+### 2. Part meshes + export + web integration ✅
+
+First deliverable: `PartView` renders a single part's mesh from its definition,
+reusing `@tts/mesh` geometry (not the web app's viewers). This is the smallest
+useful slice and unblocks the web app's part inspection route immediately.
+
+- `PartView` (`partView.tsx`): creates a mesh from a `Part` definition:
+  - `size` → world dimensions; `fillet` → corner radius.
+  - `face`/`faceCrop`/`back`/`backCrop` → textures (drei `useTexture`), sprite
+    UVs from `faceCrop`/`backCrop` (a `[col,row,cols,rows]` grid cell).
+  - `shape` → traced silhouette (via the proxy `/trace`, like the web token
+    viewer) or a fallback rect/rounded-rect.
+  - `extrudeShapeParts` from `@tts/mesh` for the mesh.
+- Shared geometry/material caching (module-level `Map`s) so repeated parts
+  reuse buffers, mirroring the web viewers' `sharedResources`.
+- Export `PartView` from `index.ts`.
+- **Web integration**: replace the web app's part inspection route
+  (`/bgm/:id/parts/:type/:part`) to render `PartView` from the library, proving
+  it end-to-end.
+
+### 3. State store (`state.ts`) ✅
+
+Source-of-truth game state per `../bgm/tabletop.md` §2:
+
+```ts
+interface GameState {
+  surfaces: Record<string, boolean>; // enabled per surface id
+  parts: Record<string, PartState>;  // part id -> placement state
+}
+
+interface PartState {
+  path: string;  // the path key this part is on
+  index: number; // the part's position in its path's stack
+  facing: 'face' | 'back' | 'standing'; // how the part is oriented on the board
+}
+```
+
+- A zustand store holding `GameState`.
+- **Derived render state**: `game state + surface routes => map of piece id to
+  `{ surface, route, candidate, index, stackSize, face }``, per enabled surface.
+  Computed with a selector/memo so the render list is stable. A path's ordered
+  children (for stacking) are derived from the parts map by sorting on `index`.
+- **Assumption**: each piece id is unique on the board (documented in
+  `../bgm/tabletop.md`); the render map is keyed by piece id.
+
+### 4. Setup seeding (`setup.ts`) ✅
+
+- `SetupLoader`: side-effect-only component that seeds the store from a
+  `Setup` — enables its `surfaces` (or all when omitted) and applies its
+  ordered `setup` placements (each moves its `parts` to a `path`).
+- `setup` value expansion: a bare `type` (no id) expands to all parts of that
+  type (documented in `../bgm/format.md` §3; the loader doesn't do this — it's a
+  game-state init concern, so it lives here).
+
+### 5. Surface mounting (`mount.ts`) ✅
+
+- Resolve the surface mount tree from `Surface.mount` + `Surface.children`:
+  - `kind: table` — root, world space.
+  - `kind: hud` — HUD area (`mount.area`).
+  - `kind: child` — mounted relative to a parent that lists it in `children`.
+- `WorldSurfaceView` / `HudSurfaceView` mount an enabled surface; a disabled
+  surface isn't rendered. Child surfaces mount relative to their parent's
+  anchor (`x`/`y`/`rotation`).
+
+### 6. Part placement (`placement.ts`) ✅
+
+- `PartPlacement`: stable per-part component that positions a part on a surface
+  location from the derived render state (route anchor + candidate anchor).
+- Applies the route's stacking strategy via `useStacking`.
+
+### 7. Stacking (`stacking.ts`) ✅
+
+- `useStacking(route.stacking, index, stackSize)` → `{ x, y, rotation, z, tilt }`.
+- Implements the format's positioning process (`../bgm/format.md` §4): step
+  length from curve length / `max(steps, count-1)`, alignment (`start`/`end`/
+  `center`), and `limit` (`0` all, `n` first n, `-n` last n).
+- `z` ramps linearly from `zStart` to `zEnd` across the curve's span; `tilt`
+  rotates each shown part about its local Y (long) axis.
+- Curve length from an SVG path string (small helper; no new dep).
+
+### 8. Public API (`index.ts`) ✅
+
+Export `SetupLoader`, `WorldSurfaceView`, `HudSurfaceView`, `PartPlacement`,
+`PartView`, `useStacking`, and the store hooks. The web app consumes these; the
+library never imports from `apps/*`.
+
+## Reuse from `@tts/mesh`
+
+- `extrudeShapeParts` / `extrudeShape` — front/back/walls geometry.
+- `rectShape`, `roundedRectShape`, `circleShape`, `polygonShape`, `hexShape`,
+  `frameShape`, `scaleShape` — shape generators for parts without a `shape`
+  sprite.
+- `shapeFromThree` — author shapes with the three.js path API.
+- `ExtrudedGeometry` / `UVBounds` — raw typed arrays + UV framing.
+
+The web viewers (`TokenViewer`/`CardViewer`) contain logic we'll mirror rather
+than import: trace-to-shape conversion, sprite UV math, texture flipping. These
+are candidates to lift into `@tts/mesh` or `@tts/tabletop` later so both
+consumers share them (see Open decisions).
+
+## Testing
+
+- `state.ts` — derived render state: enabled surfaces, route matching,
+  candidate selection, stacking index/stackSize.
+- `stacking.ts` — positioning process: step length, alignment, limit, z ramp,
+  tilt.
+- `setup.ts` — seeding + bare-type expansion.
+- `mount.ts` — mount tree resolution (table/hud/child, children refs).
+- `partView.tsx` — geometry from a part def (size/fillet/crop), sprite UVs.
+- A real `vite build` integration test (mirroring `packages/bgm/src/vite.test.ts`)
+  proving the library bundles against a fixture package.
+
+## Validation
+
+- `pnpm --filter @tts/tabletop build` / `typecheck` / `test`.
+- Root `pnpm test` stays green.
+- `pnpm --filter @tts/web build` — the part inspection route renders `PartView`
+  from the library (work item 2), proving it end-to-end.
+
+## Free interaction (layer 3) ✅
+
+Sandbox interaction is built per [`../bgm/interactions.md`](../bgm/interactions.md):
+
+- `interactions.ts` — the held part + dialog stack (UI state, outside the game
+  store), plus pure helpers (`interactionsFor`, `dropPaths`, `pickPath`,
+  `partFacings`, `nextFacing`).
+- `state.ts` — `setFacing` alongside `movePart` (the `move(id, path, index?)`
+  primitive, defaulting to top of stack).
+- `placement.tsx` — `PartPlacement` is now interactive: pick up a part (held,
+  lifted above the board), drag to a path anchor to `move`, click to cycle
+  facing. A drop on a path with a stack-dialog interaction opens the deck
+  dialog instead of moving directly.
+- `dialog.tsx` — `DialogLayer`, the stack-inspector dialog: an alternate view
+  of a stack with an insertion cursor; its insert button issues a `move`.
+- `@tts/bgm` — the `dialog` role, `Setup.interactions`, and `Package.dialogs`
+  (schema + collection + serialization).
+- Demo: `games/poker` declares an `interactions:` + `role: dialog` (stack
+  insert) on the deck.
+
+The rule seam (layer 4) is a no-op filter: sandbox applies intents directly.
+
+## Commands (not yet implemented)
+
+Scripted interaction is designed in [`../bgm/commands.md`](../bgm/commands.md):
+async commands with `ok`/`cancel`/`error` results, per-invocation run
+contexts, fire-and-forget vs self-managed waiting, and tap interaction with
+part-local trigger points. Implementation order: types + run-context manager,
+tap detection, then the first commands (`wait: tap`, `focus`).
+
+## Open decisions (defaults in bold)
+
+- **Where the trace/sprite helpers live** — **lift into `@tts/mesh`** (shared
+  by web viewers + tabletop) vs duplicate in `@tts/tabletop`. Lifting is
+  cleaner but touches the web viewers; decide when `PartView` (work item 2)
+  needs them.
+- **HUD rendering** — **drei `Html`/orthographic overlay** vs a second
+  `Canvas`. Default to an overlay so world + HUD share one scene.
+- **Curve length** — **small internal SVG-path length helper** vs a dependency
+  (e.g. `svg-path-properties`). Prefer the helper to avoid a dep.

docs/status/full-setup-view.md

@@ -81,9 +81,10 @@ view and the full-setup view.
   `textureUrl + color + roughness`. drei already caches textures by URL
   globally, so sharing the material on top avoids per-object material
   allocation for tiles/tokens with the same image.
-- **Cards are the exception:** each card clones its texture for sprite UVs, so
-  its face material cannot be shared — but its geometry still can (same card
-  size).
+- **Cards:** the face/back textures are shared (drei caches them by URL) and
+  the sprite cell is selected via a per-material UV transform injected into the
+  shader (`cardMaterial.ts`), so cards share texture, shader, and geometry —
+  only the material uniforms differ. Materials are cached per card id + tint.
 - Dispose shared resources on page unmount, or accept a module-level cache for
   the session (see Open decisions).
 

docs/status/implementation-plan.md

@@ -2,8 +2,8 @@
 
 > **Scope:** The concrete build plan — files, endpoints, dependencies, build
 > order. For the system's architecture and dependency graph, see
-> [`architecture.md`](./architecture.md). For the rationale behind key decisions,
-> see [`decisions.md`](./decisions.md).
+> [`../architecture.md`](../architecture.md). For the rationale behind key decisions,
+> see [`../decisions.md`](../decisions.md).
 
 A lightweight, client-only pnpm monorepo for searching the Tabletop Simulator
 Steam Workshop, fetching full TTS save files, and analyzing their contents.
@@ -55,7 +55,16 @@ tts-workshop/
 ├── .npmrc
 ├── .env.example                # STEAM_API_KEY, PORT
 ├── docs/
-│   └── implementation-plan.md  # this file
+│   ├── overview.md
+│   ├── architecture.md
+│   ├── decisions.md
+│   ├── bgm/
+│   │   ├── format.md
+│   │   ├── engine.md
+│   │   ├── commands.md
+│   │   └── tabletop.md
+│   └── status/
+│       └── implementation-plan.md  # this file
 ├── apps/
 │   ├── proxy/
 │   │   ├── package.json
@@ -155,8 +164,8 @@ Low-level fetcher, extracted from the existing scraper.
     (no Steam API call).
   - `fetchModFile(id, apiKey)` / `fetchModFileFromUrl(fileUrl)` — raw save
     bytes + derived filename, with and without the Steam API.
-  - `getFileName(url: string): Promise<string>` — derive filename from the
-    `content-disposition` header.
+  - `getFileName(url: string): string` — derive a filename from the save URL
+    path (the upstream `content-disposition` header is ignored).
 - `errors.ts`
   - Typed errors: missing `file_url`, Steam API failure, rate limit, invalid key.
 - Notes
@@ -237,8 +246,8 @@ Hono server exposing search + fetch.
   - `GET /items/:id` — full parsed `TTSMod`. Accepts an optional `fileUrl`
     query param to download the save directly (no Steam API key needed);
     otherwise resolves via the Steam API.
-  - `GET /items/:id/file` — raw save bytes, filename from `getFileName`. Also
-    accepts `fileUrl`.
+  - `GET /items/:id/file` — raw save bytes, filename from `getFileName` (the
+    URL path). Also accepts `fileUrl`.
 - `routes/asset.ts`
   - `GET /asset?url=...` — fetch an external asset (texture, model) and stream
     it back with a `Content-Type` header. Workshop hosts often omit CORS
@@ -325,7 +334,7 @@ proxy API and `packages/extract` directly for analysis.
 | GET    | `/health`           | Liveness                                     | —    |
 | GET    | `/search?q=&page=`  | Scrape Workshop browse, return item list     | —    |
 | GET    | `/items/:id`        | Full parsed `TTSMod` (`?fileUrl=` skips key) | key* |
-| GET    | `/items/:id/file`   | Raw save bytes, filename from header         | key* |
+| GET    | `/items/:id/file`   | Raw save bytes, filename from URL path       | key* |
 | GET    | `/asset?url=`       | CORS-safe proxy for external assets          | —    |
 | GET    | `/trace?url=&mode=&format=&offset=` | Trace an image into a vector shape (BSON) | —    |
 

games/carcassonne/carcassonne.md

@@ -0,0 +1,226 @@
+# Carcassonne
+
+The base game's 24 landscape tiles, laid out on a table with a draw pile and a
+grid of placed tiles. Each tile is a single `110×110` image (A–X), sized to a
+standard `45×45` mm square.
+
+```yaml role=package
+id: carcassonne
+title: Carcassonne
+designer: Klaus-Jürgen Wrede
+publisher: Hans im Glück
+players: 5
+language: en
+include: ['./**/*.yaml']
+```
+
+## Parts
+
+One `tile` part per distinct tile type (A–X). All tiles share the same square
+face image and a uniform size; the `$variants` CSV expands them into the 24
+tile parts.
+
+```yaml role=part.tile
+face: ./20AE_Base_Game_C2_Tile_A.png
+size: [45, 45, 3]
+fillet: 1
+$variants: ./tiles.csv
+```
+
+```csv file=tiles.csv
+id,face
+string,string
+a,./20AE_Base_Game_C2_Tile_A.png
+b,./20AE_Base_Game_C2_Tile_B.png
+c,./20AE_Base_Game_C2_Tile_C.png
+d,./20AE_Base_Game_C2_Tile_D.png
+e,./20AE_Base_Game_C2_Tile_E.png
+f,./20AE_Base_Game_C2_Tile_F.png
+g,./20AE_Base_Game_C2_Tile_G.png
+h,./20AE_Base_Game_C2_Tile_H.png
+i,./20AE_Base_Game_C2_Tile_I.png
+j,./20AE_Base_Game_C2_Tile_J.png
+k,./20AE_Base_Game_C2_Tile_K.png
+l,./20AE_Base_Game_C2_Tile_L.png
+m,./20AE_Base_Game_C2_Tile_M.png
+n,./20AE_Base_Game_C2_Tile_N.png
+o,./20AE_Base_Game_C2_Tile_O.png
+p,./20AE_Base_Game_C2_Tile_P.png
+q,./20AE_Base_Game_C2_Tile_Q.png
+r,./20AE_Base_Game_C2_Tile_R.png
+s,./20AE_Base_Game_C2_Tile_S.png
+t,./20AE_Base_Game_C2_Tile_T.png
+u,./20AE_Base_Game_C2_Tile_U.png
+v,./20AE_Base_Game_C2_Tile_V.png
+w,./20AE_Base_Game_C2_Tile_W.png
+x,./20AE_Base_Game_C2_Tile_X.png
+```
+
+## Board
+
+A table with a draw pile on the left and an `11×11` grid of placed tiles in the
+middle. The grid routes each tile to its `col,row` cell, spaced `45` mm apart
+so tiles sit edge to edge.
+
+```yaml role=surface.board
+id: board
+size: [600, 600]
+layout:
+  - route: /draw
+    x: -280
+    y: 0
+    rotation: 0
+    stacking:
+      align: center
+      zStart: 0
+      curve: M -50 -200 C 50 -150 450 -150 550 -200
+  - route: /grid/:col/:row
+    candidates:
+      $variants: ./grid.csv
+```
+
+```csv file=grid.csv
+col,row,x,y,rotation
+string,string,number,number,number
+0,0,-225,-225,0
+0,1,-225,-180,0
+0,2,-225,-135,0
+0,3,-225,-90,0
+0,4,-225,-45,0
+0,5,-225,0,0
+0,6,-225,45,0
+0,7,-225,90,0
+0,8,-225,135,0
+0,9,-225,180,0
+0,10,-225,225,0
+1,0,-180,-225,0
+1,1,-180,-180,0
+1,2,-180,-135,0
+1,3,-180,-90,0
+1,4,-180,-45,0
+1,5,-180,0,0
+1,6,-180,45,0
+1,7,-180,90,0
+1,8,-180,135,0
+1,9,-180,180,0
+1,10,-180,225,0
+2,0,-135,-225,0
+2,1,-135,-180,0
+2,2,-135,-135,0
+2,3,-135,-90,0
+2,4,-135,-45,0
+2,5,-135,0,0
+2,6,-135,45,0
+2,7,-135,90,0
+2,8,-135,135,0
+2,9,-135,180,0
+2,10,-135,225,0
+3,0,-90,-225,0
+3,1,-90,-180,0
+3,2,-90,-135,0
+3,3,-90,-90,0
+3,4,-90,-45,0
+3,5,-90,0,0
+3,6,-90,45,0
+3,7,-90,90,0
+3,8,-90,135,0
+3,9,-90,180,0
+3,10,-90,225,0
+4,0,-45,-225,0
+4,1,-45,-180,0
+4,2,-45,-135,0
+4,3,-45,-90,0
+4,4,-45,-45,0
+4,5,-45,0,0
+4,6,-45,45,0
+4,7,-45,90,0
+4,8,-45,135,0
+4,9,-45,180,0
+4,10,-45,225,0
+5,0,0,-225,0
+5,1,0,-180,0
+5,2,0,-135,0
+5,3,0,-90,0
+5,4,0,-45,0
+5,5,0,0,0
+5,6,0,45,0
+5,7,0,90,0
+5,8,0,135,0
+5,9,0,180,0
+5,10,0,225,0
+6,0,45,-225,0
+6,1,45,-180,0
+6,2,45,-135,0
+6,3,45,-90,0
+6,4,45,-45,0
+6,5,45,0,0
+6,6,45,45,0
+6,7,45,90,0
+6,8,45,135,0
+6,9,45,180,0
+6,10,45,225,0
+7,0,90,-225,0
+7,1,90,-180,0
+7,2,90,-135,0
+7,3,90,-90,0
+7,4,90,-45,0
+7,5,90,0,0
+7,6,90,45,0
+7,7,90,90,0
+7,8,90,135,0
+7,9,90,180,0
+7,10,90,225,0
+8,0,135,-225,0
+8,1,135,-180,0
+8,2,135,-135,0
+8,3,135,-90,0
+8,4,135,-45,0
+8,5,135,0,0
+8,6,135,45,0
+8,7,135,90,0
+8,8,135,135,0
+8,9,135,180,0
+8,10,135,225,0
+9,0,180,-225,0
+9,1,180,-180,0
+9,2,180,-135,0
+9,3,180,-90,0
+9,4,180,-45,0
+9,5,180,0,0
+9,6,180,45,0
+9,7,180,90,0
+9,8,180,135,0
+9,9,180,180,0
+9,10,180,225,0
+10,0,225,-225,0
+10,1,225,-180,0
+10,2,225,-135,0
+10,3,225,-90,0
+10,4,225,-45,0
+10,5,225,0,0
+10,6,225,45,0
+10,7,225,90,0
+10,8,225,135,0
+10,9,225,180,0
+10,10,225,225,0
+```
+
+## Setup
+
+Start with the full tile supply on the draw pile (`carcassonne:tile` expands to
+every tile of that type), then seed the grid with a few opening tiles.
+
+```yaml role=setup.game
+id: main
+surfaces:
+  - board#board
+setup:
+  - path: /draw
+    parts: carcassonne:tile
+  - path: /grid/5/5
+    parts: carcassonne:tile#a
+  - path: /grid/5/6
+    parts: carcassonne:tile#b
+  - path: /grid/6/5
+    parts: carcassonne:tile#c
+```

games/poker/poker.md

@@ -0,0 +1,162 @@
+# Poker
+
+A standard 52-card poker deck, laid out on a table with a draw pile and
+community-card slots. Exercises the bgm loader's `$variants` expansion to
+generate a full deck from a single part definition.
+
+```yaml role=package
+id: poker
+title: Poker
+designer: Public Domain
+players: 9
+language: en
+include: ['./**/*.yaml']
+```
+
+## Parts
+
+A single `card` part expanded into 52 cards by the `$variants` CSV. Each row
+picks a cell from the `13×4` face sheet (`cards-13x4.jpg`) — 13 ranks across,
+4 suits down. All cards share the same back from the `4×1` back sheet
+(`back-4x1.png`).
+
+```yaml role=part.card
+face: ./cards-13x4.jpg
+back: ./back-4x1.png
+size: [63, 88, 0.3]
+fillet: 2
+$variants: ./cards.csv
+```
+
+```csv file=cards.csv
+id,rank,suit,faceCrop,backCrop
+string,string,string,[number;number;number;number],[number;number;number;number]
+2s,2,spades,[0;0;13;4],[0;0;4;1]
+3s,3,spades,[1;0;13;4],[0;0;4;1]
+4s,4,spades,[2;0;13;4],[0;0;4;1]
+5s,5,spades,[3;0;13;4],[0;0;4;1]
+6s,6,spades,[4;0;13;4],[0;0;4;1]
+7s,7,spades,[5;0;13;4],[0;0;4;1]
+8s,8,spades,[6;0;13;4],[0;0;4;1]
+9s,9,spades,[7;0;13;4],[0;0;4;1]
+10s,10,spades,[8;0;13;4],[0;0;4;1]
+js,J,spades,[9;0;13;4],[0;0;4;1]
+qs,Q,spades,[10;0;13;4],[0;0;4;1]
+ks,K,spades,[11;0;13;4],[0;0;4;1]
+as,A,spades,[12;0;13;4],[0;0;4;1]
+2h,2,hearts,[0;1;13;4],[0;0;4;1]
+3h,3,hearts,[1;1;13;4],[0;0;4;1]
+4h,4,hearts,[2;1;13;4],[0;0;4;1]
+5h,5,hearts,[3;1;13;4],[0;0;4;1]
+6h,6,hearts,[4;1;13;4],[0;0;4;1]
+7h,7,hearts,[5;1;13;4],[0;0;4;1]
+8h,8,hearts,[6;1;13;4],[0;0;4;1]
+9h,9,hearts,[7;1;13;4],[0;0;4;1]
+10h,10,hearts,[8;1;13;4],[0;0;4;1]
+jh,J,hearts,[9;1;13;4],[0;0;4;1]
+qh,Q,hearts,[10;1;13;4],[0;0;4;1]
+kh,K,hearts,[11;1;13;4],[0;0;4;1]
+ah,A,hearts,[12;1;13;4],[0;0;4;1]
+2d,2,diamonds,[0;2;13;4],[0;0;4;1]
+3d,3,diamonds,[1;2;13;4],[0;0;4;1]
+4d,4,diamonds,[2;2;13;4],[0;0;4;1]
+5d,5,diamonds,[3;2;13;4],[0;0;4;1]
+6d,6,diamonds,[4;2;13;4],[0;0;4;1]
+7d,7,diamonds,[5;2;13;4],[0;0;4;1]
+8d,8,diamonds,[6;2;13;4],[0;0;4;1]
+9d,9,diamonds,[7;2;13;4],[0;0;4;1]
+10d,10,diamonds,[8;2;13;4],[0;0;4;1]
+jd,J,diamonds,[9;2;13;4],[0;0;4;1]
+qd,Q,diamonds,[10;2;13;4],[0;0;4;1]
+kd,K,diamonds,[11;2;13;4],[0;0;4;1]
+ad,A,diamonds,[12;2;13;4],[0;0;4;1]
+2c,2,clubs,[0;3;13;4],[0;0;4;1]
+3c,3,clubs,[1;3;13;4],[0;0;4;1]
+4c,4,clubs,[2;3;13;4],[0;0;4;1]
+5c,5,clubs,[3;3;13;4],[0;0;4;1]
+6c,6,clubs,[4;3;13;4],[0;0;4;1]
+7c,7,clubs,[5;3;13;4],[0;0;4;1]
+8c,8,clubs,[6;3;13;4],[0;0;4;1]
+9c,9,clubs,[7;3;13;4],[0;0;4;1]
+10c,10,clubs,[8;3;13;4],[0;0;4;1]
+jc,J,clubs,[9;3;13;4],[0;0;4;1]
+qc,Q,clubs,[10;3;13;4],[0;0;4;1]
+kc,K,clubs,[11;3;13;4],[0;0;4;1]
+ac,A,clubs,[12;3;13;4],[0;0;4;1]
+```
+
+## Board
+
+A table with a draw pile on the left and five community-card slots across the
+middle. The deck pile fans its stacked cards along a curve.
+
+```yaml role=surface.board
+id: poker
+size: [600, 400]
+layout:
+  - route: /deck
+    x: -250
+    y: 0
+    rotation: 0
+    stacking:
+      align: center
+      zStart: 0
+      #zEnd: 100
+      curve: M -50 -200 C 50 -150 450 -150 550 -200
+  - route: /community/:slot
+    candidates:
+      $variants: ./community.csv
+```
+
+```csv file=community.csv
+slot,x,y,rotation
+string,number,number,number
+0,-100,0,0
+1,-50,0,0
+2,0,0,0
+3,50,0,0
+4,100,0,0
+```
+
+## Setup
+
+Deal the whole deck facedown onto the draw pile (`poker:card` expands to every
+card of that type, `facing: back`), then flip a flop onto the community slots
+and stand a couple of drawn cards on their bottom edge.
+
+```yaml role=setup.game
+id: main
+setup:
+  - path: /deck
+    parts: poker:card
+    facing: back
+  - path: /community/0
+    parts: poker:card#as
+  - path: /community/1
+    parts: poker:card#kh
+  - path: /community/2
+    parts: poker:card#7d
+  - path: /community/3
+    parts: poker:card#jc
+    facing: standing
+  - path: /community/4
+    parts: poker:card#2h
+    facing: standing
+interactions:
+  - dialog: prompt#insert
+    on: [/deck]
+```
+
+## Dialog
+
+Inserting a card into the middle of the deck is a compound interaction: the
+deck is lifted into a stack-inspector dialog with an insertion cursor. The
+cursor *is* the index — `move(id, /deck, index)` is discovered by scrolling,
+not typed.
+
+```yaml role=dialog.prompt
+id: insert
+title: Insert into deck
+body: Scroll to the insertion point, then insert the held card.
+widget: stack
+```

package.json

@@ -13,6 +13,7 @@
   },
   "packageManager": "pnpm@10.33.0",
   "devDependencies": {
+    "@vitest/coverage-v8": "^4.1.10",
     "typescript": "^5.7.2",
     "vitest": "^4.1.10"
   }

packages/bgm/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@tts/bgm",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "test": "vitest run",
+    "lint": "echo \"no lint configured\""
+  },
+  "dependencies": {
+    "vite": "^8.2.1",
+    "marked": "^16.0.0",
+    "picomatch": "^4.0.5",
+    "smol-toml": "^1.4.0",
+    "typed-csv": "^2.0.0",
+    "yaml": "^2.4.2",
+    "zod": "^3.24.1"
+  },
+  "devDependencies": {
+    "@types/node": "^22.12.0",
+    "@types/picomatch": "^4.0.0",
+    "typescript": "^5.7.2",
+    "vitest": "^4.1.10"
+  }
+}

packages/bgm/src/__fixtures__/harbor/harbor.md

@@ -0,0 +1,100 @@
+# Harbor
+
+A tiny example game used to exercise the bgm loader.
+
+```yaml role=package
+id: harbor
+title: Harbor
+designer: Jane Doe
+players: 2
+language: en
+include: ['./**/*.yaml']
+```
+
+## Tokens
+
+```yaml role=part.token
+id: wood
+face: ./assets/tokens.png
+faceCrop: [1, 0, 5, 2]
+back: ./assets/tokens.png
+backCrop: [3, 0, 5, 2]
+shape: ./assets/token-shape.png
+size: [20, 20, 3]
+fillet: 2
+```
+
+```yaml role=part.token
+id: grain
+face: ./assets/tokens.png
+faceCrop: [0, 0, 5, 2]
+back: ./assets/tokens.png
+backCrop: [2, 0, 5, 2]
+shape: ./assets/token-shape.png
+size: [20, 20, 3]
+fillet: 2
+```
+
+## Board
+
+```yaml role=surface.board
+id: harbor
+size: [300, 200]
+mount:
+  kind: table
+  x: 0
+  y: 0
+  rotation: 0
+children:
+  - board#player
+layout:
+  - route: /dock/:seat
+    candidates:
+      $variants: ./seats.csv
+  - route: /deck
+    x: -100
+    y: 0
+    rotation: 0
+```
+
+```yaml role=surface.board
+id: player
+size: [200, 200]
+mount:
+  kind: child
+  x: 100
+  y: 50
+  rotation: 0
+layout:
+  - route: /hand/:slot
+    candidates:
+      $variants: ./hand.csv
+```
+
+```csv file=hand.csv
+slot,x,y,rotation
+string,number,number,number
+0,0,0,0
+1,0,20,0
+```
+
+```csv file=seats.csv
+seat,x,y,rotation
+string,number,number,number
+0,40,0,0
+1,40,20,0
+```
+
+## Setup
+
+```yaml role=setup.game
+id: main
+surfaces:
+  - board#harbor
+  - board#player
+setup:
+  - path: /dock/0
+    parts: harbor:token#wood
+  - path: /deck
+    parts: harbor:token#grain
+```