feat: 新增报告协作页，并强化 Deep Research 运行诊断与报告兜底

支持浏览器侧素材快照撰写、拒绝报告读时修复、Mermaid PNG 导出与 Word 导出加固。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/package.json

@@ -11,6 +11,7 @@
     "build:network": "node --max-old-space-size=8192 ./node_modules/vite/bin/vite.js build --mode network",
     "preview": "vite preview",
     "typecheck": "tsc --noEmit",
+    "test:report-collaboration": "npx esbuild src/report-collaboration/tests/event-reducer.test.ts --bundle --platform=node --format=esm --outfile=.runtime/unit-tests/event-reducer.test.mjs && npx esbuild src/report-collaboration/tests/message-adapter.test.ts --bundle --platform=node --format=esm --outfile=.runtime/unit-tests/message-adapter.test.mjs && node --test .runtime/unit-tests/event-reducer.test.mjs .runtime/unit-tests/message-adapter.test.mjs",
     "check:chrome109-css": "node scripts/check-chrome109-css.mjs",
     "check:legacy-chrome-css": "node scripts/check-chrome109-css.mjs"
   },