fix(frontend): build + remove hover tooltips in step links

- Fix Turbopack build: replace raw-loader .md import with inlined about-content.ts; drop raw-loader from next.config and package.json
- Remove all hover tooltips on step-area links (web_fetch, read_file, ls, bash, write_file, web_search) so hidden steps no longer show popups

修复：构建错误与步骤链接悬停提示
- 修复 Turbopack 构建：用内联 about-content.ts 替代 raw-loader 导入 about.md，并移除 next.config 与 package.json 中的 raw-loader
- 移除步骤区域内所有链接的悬停提示（查看网页、读文件、列目录、bash、写文件、网页搜索），隐藏步骤悬停不再弹出内容

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

frontend/package.json

@@ -97,7 +97,6 @@
     "postcss": "^8.5.3",
     "prettier": "^3.5.3",
     "prettier-plugin-tailwindcss": "^0.6.11",
-    "raw-loader": "^4.0.2",
     "tailwindcss": "^4.0.15",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.8.2",