fix: Address PR review comments

- Fix window.Electron to window.isElectron in http-api-client.ts
- Use void operator instead of async/await for onClick handlers in git-diff-panel.tsx
- Fix critical bug: correct parameter order in useStartAutoMode (maxConcurrency was passed as branchName)
- Add error handling for getApiKeys() result in use-cli-status.ts
- Add authClaude guard in claude-cli-status.tsx for consistency with deauthClaude
- Add optional chaining on api object in cursor-cli-status.tsx

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/lib/http-api-client.ts

@@ -161,7 +161,7 @@ const getServerUrl = (): string => {
 
     // In web mode (not Electron), use relative URL to leverage Vite proxy
     // This avoids CORS issues since requests appear same-origin
-    if (!window.Electron) {
+    if (!window.isElectron) {
       return '';
     }
   }