refactor: improve error handling and code formatting

- Enhanced error messages in Rust backend to include file paths
- Improved provider switching error handling with detailed messages
- Added MCP button placeholder in UI (functionality TODO)
- Applied code formatting across frontend components
- Extended error notification duration to 6s for better readability

src/vite-env.d.ts

@@ -64,31 +64,33 @@ declare global {
       testApiEndpoints: (
         urls: string[],
         options?: { timeoutSecs?: number },
-      ) => Promise<Array<{
-        url: string;
-        latency: number | null;
-        status?: number;
-        error?: string;
-      }>>;
+      ) => Promise<
+        Array<{
+          url: string;
+          latency: number | null;
+          status?: number;
+          error?: string;
+        }>
+      >;
       // 自定义端点管理
       getCustomEndpoints: (
         appType: AppType,
-        providerId: string
+        providerId: string,
       ) => Promise<CustomEndpoint[]>;
       addCustomEndpoint: (
         appType: AppType,
         providerId: string,
-        url: string
+        url: string,
       ) => Promise<void>;
       removeCustomEndpoint: (
         appType: AppType,
         providerId: string,
-        url: string
+        url: string,
       ) => Promise<void>;
       updateEndpointLastUsed: (
         appType: AppType,
         providerId: string,
-        url: string
+        url: string,
       ) => Promise<void>;
     };
     platform: {