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/config/codexProviderPresets.ts

@@ -32,7 +32,7 @@ export function generateThirdPartyAuth(apiKey: string): Record<string, any> {
 export function generateThirdPartyConfig(
   providerName: string,
   baseUrl: string,
-  modelName = "gpt-5-codex"
+  modelName = "gpt-5-codex",
 ): string {
   // 清理供应商名称，确保符合TOML键名规范
   const cleanProviderName =
@@ -71,7 +71,7 @@ export const codexProviderPresets: CodexProviderPreset[] = [
     config: generateThirdPartyConfig(
       "packycode",
       "https://codex-api.packycode.com/v1",
-      "gpt-5-codex"
+      "gpt-5-codex",
     ),
     // Codex 请求地址候选（用于地址管理/测速）
     endpointCandidates: [