feat(ui): Introduce useUI Hook and UIContext (#5488)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/gemini.test.tsx

@@ -195,6 +195,7 @@ describe('gemini.tsx main function kitty protocol', () => {
       getIdeMode: () => false,
       getExperimentalZedIntegration: () => false,
       getScreenReader: () => false,
+      getGeminiMdFileCount: () => 0,
     } as unknown as Config);
     vi.mocked(loadSettings).mockReturnValue({
       errors: [],
@@ -323,11 +324,19 @@ describe('startInteractiveUI', () => {
     const { render } = await import('ink');
     const renderSpy = vi.mocked(render);
 
+    const mockInitializationResult = {
+      authError: null,
+      themeError: null,
+      shouldOpenAuthDialog: false,
+      geminiMdFileCount: 0,
+    };
+
     await startInteractiveUI(
       mockConfig,
       mockSettings,
       mockStartupWarnings,
       mockWorkspaceRoot,
+      mockInitializationResult,
     );
 
     // Verify render was called with correct options
@@ -349,11 +358,19 @@ describe('startInteractiveUI', () => {
     const { checkForUpdates } = await import('./ui/utils/updateCheck.js');
     const { registerCleanup } = await import('./utils/cleanup.js');
 
+    const mockInitializationResult = {
+      authError: null,
+      themeError: null,
+      shouldOpenAuthDialog: false,
+      geminiMdFileCount: 0,
+    };
+
     await startInteractiveUI(
       mockConfig,
       mockSettings,
       mockStartupWarnings,
       mockWorkspaceRoot,
+      mockInitializationResult,
     );
 
     // Verify all startup tasks were called