fix: resolve startup issues with account activation, credit fetch and poll noise

- GoogleAPIService: try loadCodeAssist first for AI credits since
  fetchCredits returns 404 for many accounts; keep fetchCredits as
  fallback, removing the spurious warn on every poll cycle
- CloudAccountRepo: auto-activate the most-recently-used account when
  no account has is_active=1; downgrade noisy [DEBUG] log from info
  to debug level
- StatusBar: increase process-status refetch interval from 10s to 30s
  to reduce redundant IPC calls and log noise

src/components/StatusBar.tsx

@@ -18,7 +18,7 @@ export const StatusBar: React.FC<StatusBarProps> = ({ isCollapsed = false }) =>
   const { data: isRunning, isLoading } = useQuery({
     queryKey: ['process', 'status'],
     queryFn: isProcessRunning,
-    refetchInterval: 10000,
+    refetchInterval: 30000,
   });
 
   const startMutation = useMutation({