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/hook.mjs

@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+/**
+ * Impeccable design hook — PostToolUse + Stop entry point.
+ *
+ * Reads the Claude Code / Codex / Cursor hook event from stdin and routes by
+ * `hook_event_name`:
+ *
+ *   - PostToolUse: runs the immediate-tier detector rules against the touched
+ *     file and emits a system reminder via
+ *     `hookSpecificOutput.additionalContext` when findings exist.
+ *   - Stop: runs the FULL detector rule set over every UI file touched this
+ *     session (the deep pass), deduped against what the per-edit pass already
+ *     surfaced, and emits once via the Stop additionalContext channel.
+ *
+ * Contract: never break a turn. Always exit 0. Clean files emit a small ack
+ * unless quiet mode is enabled; a clean Stop pass is silent.
+ *
+ * Most logic lives in `hook-lib.mjs` so it is unit-testable without a
+ * subprocess. This file is the thin stdin/stdout adapter.
+ */
+
+import { runHook, runStopHook, writeAuditLog } from './hook-lib.mjs';
+
+async function readStdin() {
+  if (process.stdin.isTTY) return '';
+  const chunks = [];
+  for await (const chunk of process.stdin) chunks.push(chunk);
+  return Buffer.concat(chunks).toString('utf-8');
+}
+
+function isStopEvent(stdinJson) {
+  try {
+    const event = JSON.parse(stdinJson);
+    return event && typeof event === 'object' && event.hook_event_name === 'Stop';
+  } catch {
+    // Malformed stdin falls through to runHook, which audits the skip.
+    return false;
+  }
+}
+
+async function main() {
+  // Snapshot the inherited env FIRST so the re-entrancy guard checks the
+  // parent's value, not the value we are about to export for any child
+  // processes the hook might ever spawn.
+  const inheritedEnv = { ...process.env };
+  process.env.IMPECCABLE_HOOK_DEPTH = process.env.IMPECCABLE_HOOK_DEPTH || '1';
+
+  let stdinJson = '';
+  try { stdinJson = await readStdin(); } catch { /* fall through */ }
+
+  const run = isStopEvent(stdinJson) ? runStopHook : runHook;
+  const result = await run({
+    stdinJson,
+    env: inheritedEnv,
+    cwd: process.cwd(),
+  });
+
+  writeAuditLog(process.env, result.audit, process.cwd());
+
+  if (result.stdout) process.stdout.write(result.stdout);
+  process.exit(result.exitCode || 0);
+}
+
+main().catch((err) => {
+  // Last-ditch: never break the agent's turn even if something we did not
+  // anticipate goes wrong. Audit-log the failure if logging is enabled.
+  try {
+    writeAuditLog(process.env, {
+      ts: new Date().toISOString(),
+      event: 'hook-error',
+      error: String(err && err.message ? err.message : err),
+    });
+  } catch { /* swallow */ }
+  if (process.env.IMPECCABLE_HOOK_DEBUG) {
+    process.stderr.write(`[impeccable-hook] ${err}\n`);
+  }
+  process.exit(0);
+});