feat: fix CLI authentication detection to prevent unnecessary browser prompts

- Fix Claude, Codex, and Cursor auth handlers to check if CLI is already authenticated
- Use same detection logic as each provider's internal checkAuth/codexAuthIndicators()
- For Codex: Check for API keys and auth files before requiring manual login
- For Cursor: Check for env var and credentials files before requiring manual auth
- For Claude: Check for cached auth tokens, settings, and credentials files
- If CLI is already authenticated: Just reconnect by removing disconnected marker
- If CLI needs auth: Tell user to manually run login command
- This prevents timeout errors when login commands can't run in non-interactive mode

apps/ui/src/lib/electron.ts

@@ -1,6 +1,6 @@
 // Type definitions for Electron IPC API
 import type { SessionListItem, Message } from '@/types/electron';
-import type { ClaudeUsageResponse } from '@/store/app-store';
+import type { ClaudeUsageResponse, CodexUsageResponse } from '@/store/app-store';
 import type {
   IssueValidationVerdict,
   IssueValidationConfidence,
@@ -725,6 +725,9 @@ export interface ElectronAPI {
     }>;
   };
   ideation?: IdeationAPI;
+  codex?: {
+    getUsage: () => Promise<CodexUsageResponse>;
+  };
 }
 
 // Note: Window interface is declared in @/types/electron.d.ts