Added in proper checks for customer tiers in 429/Quota error messaging (#3863)

Co-authored-by: Ioannis Papapanagiotou <iduckhd@hotmail.com>

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

@@ -67,6 +67,7 @@ interface MockServerConfig {
   getAccessibility: Mock<() => AccessibilitySettings>;
   getProjectRoot: Mock<() => string | undefined>;
   getAllGeminiMdFilenames: Mock<() => string[]>;
+  getUserTier: Mock<() => Promise<string | undefined>>;
 }
 
 // Mock @google/gemini-cli-core and its Config class
@@ -129,6 +130,7 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
         getAllGeminiMdFilenames: vi.fn(() => ['GEMINI.md']),
         setFlashFallbackHandler: vi.fn(),
         getSessionId: vi.fn(() => 'test-session-id'),
+        getUserTier: vi.fn().mockResolvedValue(undefined),
       };
     });
   return {
@@ -155,6 +157,8 @@ vi.mock('./hooks/useAuthCommand', () => ({
     openAuthDialog: vi.fn(),
     handleAuthSelect: vi.fn(),
     handleAuthHighlight: vi.fn(),
+    isAuthenticating: false,
+    cancelAuthentication: vi.fn(),
   })),
 }));