feat(MCN工作台): 数据功能页+图标扁平化+多项UI优化

- 工作台大版本升级：hash 路由 + 6 数据功能页（周榜/热门账号/账号详情/视频详情/AI写脚本/AI写作复盘），只读复用 dsh 库副本 + 抖音榜单 JSON
- 数据库隔离：复制 dsh 库到 mcn-work-shop/，与 dsh 原库各访问各的（已 gitignore）
- 图标全面扁平化：Lucide 线性 SVG，功能图标亮色区分，文字标题去图标
- 首页重构：功能入口卡 + AI写剧本快捷卡片(2列/8个/5行预览) + 独立帮助页 + header 精简
- 新增设计技能 impeccable + taste-skill（生成网页时参考）
- 修复：fmtTime 跨 script 全局冲突(P0)、弹窗关闭、外链新标签打开等

.workbuddy/skills/impeccable/scripts/lib/is-generated.mjs

@@ -0,0 +1,69 @@
+/**
+ * Decide whether a given file is "generated" (regenerated by a build step,
+ * unsafe to write variants into) or "source" (safe to edit, changes persist).
+ *
+ * Why this matters: when the user picks an element on a page whose underlying
+ * file is regenerated by a build step (e.g. `scripts/build-sub-pages.js`
+ * rewriting `public/docs/*.html`), writing variants or accepted changes into
+ * that file is silent data loss — the next build wipes them.
+ *
+ * Signals, in order of reliability:
+ *   1. Git check-ignore: gitignored files are assumed generated.
+ *   2. File-header markers ("GENERATED", "DO NOT EDIT", "AUTO-GENERATED")
+ *      within the first ~300 characters — catches non-git projects.
+ */
+
+import { execSync } from 'node:child_process';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const HEADER_SCAN_BYTES = 300;
+const HEADER_MARKERS = [
+  /@generated\b/i,
+  /\bGENERATED\s+FILE\b/,
+  /\bAUTO-?GENERATED\b/i,
+  /\bDO\s+NOT\s+EDIT\b/i,
+];
+
+/**
+ * @param {string} filePath - absolute or cwd-relative path
+ * @param {object} [options]
+ * @param {string} [options.cwd] - project root (defaults to process.cwd())
+ */
+export function isGeneratedFile(filePath, options = {}) {
+  const cwd = options.cwd || process.cwd();
+  const absPath = path.isAbsolute(filePath) ? filePath : path.resolve(cwd, filePath);
+
+  if (isGitIgnored(absPath, cwd)) return true;
+  if (hasGeneratedHeader(absPath)) return true;
+  return false;
+}
+
+function isGitIgnored(absPath, cwd) {
+  try {
+    execSync(`git check-ignore --quiet ${JSON.stringify(absPath)}`, {
+      cwd,
+      stdio: 'ignore',
+    });
+    return true; // exit 0 = ignored
+  } catch (err) {
+    // Exit code 1 = not ignored. Exit code 128 = not a git repo or other error.
+    // In both cases, treat as "not known to be ignored."
+    return false;
+  }
+}
+
+function hasGeneratedHeader(absPath) {
+  let fd;
+  try {
+    fd = fs.openSync(absPath, 'r');
+    const buf = Buffer.alloc(HEADER_SCAN_BYTES);
+    const bytesRead = fs.readSync(fd, buf, 0, HEADER_SCAN_BYTES, 0);
+    const head = buf.slice(0, bytesRead).toString('utf-8');
+    return HEADER_MARKERS.some((re) => re.test(head));
+  } catch {
+    return false;
+  } finally {
+    if (fd !== undefined) { try { fs.closeSync(fd); } catch {} }
+  }
+}