feat(frontend): App 路由集成 + 木纹风格 CSS

App.tsx 添加 menu/game/replay 三页面路由切换，MainMenu 新增
onReplayStart 属性区分对局与回放入口。App.css 实现经典木纹
视觉风格（深棕底色、米黄文字、皮革纹理按钮），index.css 基础
重置。修复 tsconfig 中 erasableSyntaxOnly 无效选项并安装
@types/node。

package-lock.json

@@ -18,6 +18,7 @@
       },
       "devDependencies": {
         "@tauri-apps/cli": "^2.0.0",
+        "@types/node": "^25.9.1",
         "@types/react": "^19.0.0",
         "@types/react-dom": "^19.0.0",
         "@vitejs/plugin-react": "^4.4.0",
@@ -1472,6 +1473,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "25.9.1",
+      "resolved": "https://registry.npmmirror.com/@types/node/-/node-25.9.1.tgz",
+      "integrity": "sha512-xfrlY7UD5rMJk3ZVJP8BNzS28J36YJg+xp+LPXV1TdWxr8uMH5A860QNxYDGQe/ylDSgjxE52Q9VnO7p75tJxg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": ">=7.24.0 <7.24.7"
+      }
+    },
     "node_modules/@types/react": {
       "version": "19.2.15",
       "resolved": "https://registry.npmmirror.com/@types/react/-/react-19.2.15.tgz",
@@ -2360,6 +2371,13 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici-types": {
+      "version": "7.24.6",
+      "resolved": "https://registry.npmmirror.com/undici-types/-/undici-types-7.24.6.tgz",
+      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.2.3",
       "resolved": "https://registry.npmmirror.com/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",