feat: add support for stat sheet SVG rendering

Introduces the ability to discover and render `*.sheet.svg` files.
These files can contain `<text>` elements with `${key}` templates
that reactively update based on the current journal stats.

- Add `StatSheet` type and CLI scanning logic
- Implement `SheetView` for rendering SVGs with live bindings
- Add `parseSheet` utility to extract template patterns from SVG
- Update file indexer to include `.svg` files

src/cli/commands/serve.ts

@@ -15,6 +15,7 @@ import {
   processBlocks,
   type ProcessedBlocks,
 } from "../completions/block-processor.js";
+import type { StatSheet } from "../completions/types.js";
 
 interface ContentIndex {
   [path: string]: string;
@@ -83,6 +84,24 @@ function getBestIP(): string {
   return best || "localhost";
 }
 
+/**
+ * Extract the <title> from an SVG string, or null if absent.
+ */
+function extractSvgTitle(svg: string): string | null {
+  const m = /<title[^>]*>([\s\S]*?)<\/title>/i.exec(svg);
+  return m ? m[1].trim() : null;
+}
+
+/**
+ * Derive a human-readable label from a filename.
+ * "character-sheet" -> "Character Sheet"
+ */
+function labelFromId(id: string): string {
+  return id
+    .replace(/[-_]/g, " ")
+    .replace(/\b\w/g, (c) => c.toUpperCase());
+}
+
 /**
  * 扫描目录内的 .md 文件，生成索引
  */
@@ -95,6 +114,7 @@ export function scanDirectory(dir: string): {
     stats: [],
     statTemplates: [],
     sparkTables: [],
+    statSheets: [],
   };
 
   function scan(currentPath: string, relativePath: string) {
@@ -113,7 +133,8 @@ export function scanDirectory(dir: string): {
       } else if (
         entry.endsWith(".md") ||
         entry.endsWith(".csv") ||
-        entry.endsWith(".yarn")
+        entry.endsWith(".yarn") ||
+        entry.endsWith(".svg")
       ) {
         try {
           const content = readFileSync(fullPath, "utf-8");
@@ -123,6 +144,17 @@ export function scanDirectory(dir: string): {
             blocks.stats.push(...result.blocks.stats);
             blocks.statTemplates.push(...result.blocks.statTemplates);
             blocks.sparkTables.push(...result.blocks.sparkTables);
+          } else if (entry.endsWith(".sheet.svg")) {
+            index[normalizedRelPath] = content;
+            const id = entry.replace(/\.sheet\.svg$/i, "");
+            const title = extractSvgTitle(content);
+            const sheet: StatSheet = {
+              id,
+              label: title || labelFromId(id),
+              svg: content,
+              source: normalizedRelPath,
+            };
+            blocks.statSheets.push(sheet);
           } else {
             index[normalizedRelPath] = content;
           }
@@ -281,6 +313,7 @@ export function createContentServer(
     stats: [],
     statTemplates: [],
     sparkTables: [],
+    statSheets: [],
   };
   let completionsIndex: CompletionsPayload = {
     dice: [],
@@ -288,13 +321,14 @@ export function createContentServer(
     sparkTables: [],
     stats: [],
     statTemplates: [],
+    statSheets: [],
   };
 
   /** Re-scan completions from current content index and collected blocks */
   function recomputeCompletions(): void {
     completionsIndex = scanCompletions(contentIndex, collectedBlocks);
     console.log(
-      `[completions] dice=${completionsIndex.dice.length} links=${completionsIndex.links.length} sparkTables=${completionsIndex.sparkTables.length} stats=${completionsIndex.stats.length} templates=${completionsIndex.statTemplates.length}`,
+      `[completions] dice=${completionsIndex.dice.length} links=${completionsIndex.links.length} sparkTables=${completionsIndex.sparkTables.length} stats=${completionsIndex.stats.length} templates=${completionsIndex.statTemplates.length} sheets=${completionsIndex.statSheets.length}`,
     );
   }
 
@@ -319,7 +353,8 @@ export function createContentServer(
       if (
         path.endsWith(".md") ||
         path.endsWith(".csv") ||
-        path.endsWith(".yarn")
+        path.endsWith(".yarn") ||
+        path.endsWith(".svg")
       ) {
         try {
           const content = readFileSync(path, "utf-8");
@@ -333,6 +368,11 @@ export function createContentServer(
             recomputeCompletions();
           } else {
             contentIndex[relPath] = content;
+            if (relPath.endsWith(".sheet.svg")) {
+              const rescan = scanDirectory(contentDir);
+              collectedBlocks = rescan.blocks;
+              recomputeCompletions();
+            }
           }
           console.log(`[新增] ${relPath}`);
         } catch (e) {
@@ -344,7 +384,8 @@ export function createContentServer(
       if (
         path.endsWith(".md") ||
         path.endsWith(".csv") ||
-        path.endsWith(".yarn")
+        path.endsWith(".yarn") ||
+        path.endsWith(".svg")
       ) {
         try {
           const content = readFileSync(path, "utf-8");
@@ -357,6 +398,11 @@ export function createContentServer(
             recomputeCompletions();
           } else {
             contentIndex[relPath] = content;
+            if (relPath.endsWith(".sheet.svg")) {
+              const rescan = scanDirectory(contentDir);
+              collectedBlocks = rescan.blocks;
+              recomputeCompletions();
+            }
           }
           console.log(`[更新] ${relPath}`);
         } catch (e) {
@@ -368,12 +414,13 @@ export function createContentServer(
       if (
         path.endsWith(".md") ||
         path.endsWith(".csv") ||
-        path.endsWith(".yarn")
+        path.endsWith(".yarn") ||
+        path.endsWith(".svg")
       ) {
         const relPath = "/" + relative(contentDir, path).split(sep).join("/");
         delete contentIndex[relPath];
         console.log(`[删除] ${relPath}`);
-        if (relPath.endsWith(".md")) {
+        if (relPath.endsWith(".md") || relPath.endsWith(".sheet.svg")) {
           const rescan = scanDirectory(contentDir);
           collectedBlocks = rescan.blocks;
           recomputeCompletions();