refactor: 移除WebSocket同步功能及相关代码

feat(theme): 增强侧边栏选中项样式配置
style: 优化主题变量和样式覆盖逻辑
chore: 清理未使用的依赖和配置文件

tsconfig.node.json

@@ -3,6 +3,8 @@
   "include": ["electron.vite.config.*", "src/main/**/*", "src/preload/**/*"],
   "compilerOptions": {
     "composite": true,
-    "types": ["electron-vite/node"]
+    "types": ["electron-vite/node"],
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true
   }
 }