feat(MarkdownViewer):增强 Markdown 解析和渲染能力

- 添加对 GFM (GitHub Flavored Markdown) 的支持
- 增加数学公式渲染功能
- 实现加粗编号标题的特殊处理
- 优化代码块样式
- 添加图片缩放功能

BillNote_frontend/package.json

@@ -30,19 +30,23 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "github-markdown-css": "^5.8.1",
-    "katex": "^0.16.21",
+    "katex": "^0.16.22",
     "lottie-react": "^2.4.1",
     "lucide-react": "^0.487.0",
+    "markdown-navbar": "^1.4.3",
     "next-themes": "^0.4.6",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-hook-form": "^7.55.0",
     "react-hot-toast": "^2.5.2",
-    "react-markdown": "^10.1.0",
+    "react-markdown": "^8.0.7",
+    "react-medium-image-zoom": "^5.2.14",
     "react-resizable-panels": "^2.1.8",
     "react-router-dom": "^7.5.1",
     "react-syntax-highlighter": "^15.6.1",
-    "remark-gfm": "1.0.0",
+    "rehype-katex": "^6.0.2",
+    "remark-gfm": "3.0.1",
+    "remark-math": "^5.1.1",
     "sonner": "^2.0.3",
     "tailwind-merge": "^3.1.0",
     "tailwindcss": "^4.1.3",