Simplify streaming code for code assist server (#4619)

packages/cli/src/ui/App.test.tsx

@@ -138,7 +138,9 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
         getShowMemoryUsage: vi.fn(() => opts.showMemoryUsage ?? false),
         getAccessibility: vi.fn(() => opts.accessibility ?? {}),
         getProjectRoot: vi.fn(() => opts.targetDir),
-        getGeminiClient: vi.fn(() => ({})),
+        getGeminiClient: vi.fn(() => ({
+          getUserTier: vi.fn(),
+        })),
         getCheckpointingEnabled: vi.fn(() => opts.checkpointing ?? true),
         getAllGeminiMdFilenames: vi.fn(() => ['GEMINI.md']),
         setFlashFallbackHandler: vi.fn(),
@@ -639,6 +641,7 @@ describe('App UI', () => {
 
       mockConfig.getGeminiClient.mockReturnValue({
         isInitialized: vi.fn(() => true),
+        getUserTier: vi.fn(),
       } as unknown as GeminiClient);
 
       const { unmount, rerender } = render(

packages/cli/src/ui/App.tsx

@@ -206,26 +206,11 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
 
   // Sync user tier from config when authentication changes
   useEffect(() => {
-    const syncUserTier = async () => {
-      try {
-        const configUserTier = await config.getUserTier();
-        if (configUserTier !== userTier) {
-          setUserTier(configUserTier);
-        }
-      } catch (error) {
-        // Silently fail - this is not critical functionality
-        // Only log in debug mode to avoid cluttering the console
-        if (config.getDebugMode()) {
-          console.debug('Failed to sync user tier:', error);
-        }
-      }
-    };
-
     // Only sync when not currently authenticating
     if (!isAuthenticating) {
-      syncUserTier();
+      setUserTier(config.getGeminiClient()?.getUserTier());
     }
-  }, [config, userTier, isAuthenticating]);
+  }, [config, isAuthenticating]);
 
   const {
     isEditorDialogOpen,