refactor: remove implicit content sniffing and table conversion

- Split loadCSV into parseCSVString (content) and loadCSVFromPath
  (path); drop isCSV/looksLikeCsv heuristics
- Delete coerceSparkTables and markedTable label-header magic;
  plain markdown tables now render as plain tables
- Add explicit markdown role=spark-table fence syntax that converts
  pipe tables to CSV at scan time, with dice-header validation
- Map ESM-only github-slugger and csv-parse browser build to CJS in
  jest config; add content-registry tests

src/components/md-commander/stores/commandsStore.ts

@@ -2,7 +2,7 @@ import { createStore } from "solid-js/store";
 import type { MdCommanderCommand, MdCommanderCommandMap } from "../types";
 import { setupHelpCommand, clearCommand, rollCommand, trackCommand, untrackCommand, listTrackCommand } from "../commands";
 import {resolvePath} from "../../utils/path";
-import {loadCSV} from "../../utils/csv-loader";
+import {loadCSVFromPath} from "../../utils/csv-loader";
 
 const defaultCommands: MdCommanderCommandMap = {
   help: setupHelpCommand({}),
@@ -111,7 +111,7 @@ export async function loadCommandTemplatesFromCSV(
   setCommandsError(undefined);
   
   try {
-    const csv = await loadCSV<CommandTemplateRow>(resolvePath(articlePath, path));
+    const csv = await loadCSVFromPath<CommandTemplateRow>(resolvePath(articlePath, path));
 
     // 按命令分组模板
     const templatesByCommand = new Map<string, CommandTemplateRow[]>();

src/components/md-deck/hooks/deckStore.ts

@@ -1,7 +1,7 @@
 import { createStore } from "solid-js/store";
 import yaml from "js-yaml";
 import { calculateDimensions } from "./dimensions";
-import { loadCSV, CSV } from "../../utils/csv-loader";
+import { loadCSVFromPath, CSV } from "../../utils/csv-loader";
 import { formatLayers } from "./layer-parser";
 import * as layerCrud from "./layer-crud";
 import type {
@@ -461,7 +461,7 @@ export function createDeckStore(initialSrc: string = ""): DeckStore {
     setState({ isLoading: true, error: null, src: path, rawSrc: rawSrc });
 
     try {
-      const data = await loadCSV(path);
+      const data = await loadCSVFromPath(path);
 
       if (data.length === 0) {
         setState({

src/components/md-table.tsx

@@ -8,7 +8,7 @@ import {
   createResource,
 } from "solid-js";
 import { parseMarkdown } from "../markdown";
-import { loadCSV, CSV, processVariables } from "./utils/csv-loader";
+import { parseCSVString, CSV, processVariables } from "./utils/csv-loader";
 import { resolveContentRef } from "./utils/resolve-content";
 import {
   areAllLabelsNumeric,
@@ -59,7 +59,7 @@ customElement(
         if (content === null) {
           throw new Error(`Failed to resolve table content: "${ref}"`);
         }
-        return loadCSV(content);
+        return parseCSVString(content);
       },
     );
 

src/components/utils/csv-loader.ts

@@ -31,42 +31,6 @@ function parseFrontMatter(content: string): { frontmatter?: JSONObject; remainin
   }
 }
 
-/**
- * 检测字符串是否是 CSV 格式
- * @param str 待检测的字符串
- * @returns 如果是 CSV 格式返回 true
- */
-export function isCSV(str: string): boolean {
-  const trimmed = str.trim();
-  
-  // 检查是否以 YAML front matter 开头
-  if (trimmed.startsWith('---\n') || trimmed.startsWith('---\r\n')) {
-    return true;
-  }
-  
-  // 检查是否包含 CSV 特征：多行且有分隔符
-  const lines = trimmed.split(/\r?\n/).filter(line => line.trim() !== '');
-  if (lines.length < 2) {
-    return false;
-  }
-  
-  // 检测常见 CSV 分隔符
-  const separators = [',', '\t', ';', '|'];
-  const firstLine = lines[0];
-  
-  for (const sep of separators) {
-    if (firstLine.includes(sep)) {
-      // 检查其他行是否也有相同的分隔符
-      const hasSeparatorInOtherLines = lines.slice(1).some(line => line.includes(sep));
-      if (hasSeparatorInOtherLines) {
-        return true;
-      }
-    }
-  }
-  
-  return false;
-}
-
 /**
  * 解析 CSV 字符串
  * @template T 返回数据的类型，默认为 Record<string, string>
@@ -102,18 +66,12 @@ export function parseCSVString<T = Record<string, string>>(csvString: string, so
 /**
  * 加载 CSV 文件
  * @template T 返回数据的类型，默认为 Record<string, string>
- * @param pathOrContent 文件路径或 inline CSV 字符串
+ * @param path 文件路径（通过 file-index 获取内容）
  * @returns 解析后的 CSV 数据
  */
-export async function loadCSV<T = Record<string, string>>(pathOrContent: string): Promise<CSV<T>> {
-  // 检测是否是 inline CSV 数据
-  if (isCSV(pathOrContent)) {
-    return parseCSVString<T>(pathOrContent, 'inline');
-  }
-  
-  // 从索引获取文件内容
-  const content = await getIndexedData(pathOrContent);
-  return parseCSVString<T>(content, pathOrContent);
+export async function loadCSVFromPath<T = Record<string, string>>(path: string): Promise<CSV<T>> {
+  const content = await getIndexedData(path);
+  return parseCSVString<T>(content, path);
 }
 
 type JSONData = JSONArray | JSONObject | string | number | boolean | null;