remove support for workspace extensions and migrations (#11324)

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

@@ -73,7 +73,6 @@ vi.mock('./hooks/useFolderTrust.js');
 vi.mock('./hooks/useIdeTrustListener.js');
 vi.mock('./hooks/useMessageQueue.js');
 vi.mock('./hooks/useAutoAcceptIndicator.js');
-vi.mock('./hooks/useWorkspaceMigration.js');
 vi.mock('./hooks/useGitBranchName.js');
 vi.mock('./contexts/VimModeContext.js');
 vi.mock('./contexts/SessionContext.js');
@@ -100,7 +99,6 @@ import { useFolderTrust } from './hooks/useFolderTrust.js';
 import { useIdeTrustListener } from './hooks/useIdeTrustListener.js';
 import { useMessageQueue } from './hooks/useMessageQueue.js';
 import { useAutoAcceptIndicator } from './hooks/useAutoAcceptIndicator.js';
-import { useWorkspaceMigration } from './hooks/useWorkspaceMigration.js';
 import { useGitBranchName } from './hooks/useGitBranchName.js';
 import { useVimMode } from './contexts/VimModeContext.js';
 import { useSessionStats } from './contexts/SessionContext.js';
@@ -132,7 +130,6 @@ describe('AppContainer State Management', () => {
   const mockedUseIdeTrustListener = useIdeTrustListener as Mock;
   const mockedUseMessageQueue = useMessageQueue as Mock;
   const mockedUseAutoAcceptIndicator = useAutoAcceptIndicator as Mock;
-  const mockedUseWorkspaceMigration = useWorkspaceMigration as Mock;
   const mockedUseGitBranchName = useGitBranchName as Mock;
   const mockedUseVimMode = useVimMode as Mock;
   const mockedUseSessionStats = useSessionStats as Mock;
@@ -236,12 +233,6 @@ describe('AppContainer State Management', () => {
       getQueuedMessagesText: vi.fn().mockReturnValue(''),
     });
     mockedUseAutoAcceptIndicator.mockReturnValue(false);
-    mockedUseWorkspaceMigration.mockReturnValue({
-      showWorkspaceMigrationDialog: false,
-      workspaceExtensions: [],
-      onWorkspaceMigrationDialogOpen: vi.fn(),
-      onWorkspaceMigrationDialogClose: vi.fn(),
-    });
     mockedUseGitBranchName.mockReturnValue('main');
     mockedUseVimMode.mockReturnValue({
       isVimEnabled: false,