Remove previewFeatures and default to Gemini 3 (#18414)

packages/cli/src/ui/components/SettingsDialog.test.tsx

@@ -368,20 +368,12 @@ describe('SettingsDialog', () => {
 
       const { stdin, unmount, lastFrame } = renderDialog(settings, onSelect);
 
-      // Wait for initial render and verify we're on Preview Features (first setting)
-      await waitFor(() => {
-        expect(lastFrame()).toContain('Preview Features (e.g., models)');
-      });
-
-      // Navigate to Vim Mode setting and verify we're there
-      act(() => {
-        stdin.write(TerminalKeys.DOWN_ARROW as string);
-      });
+      // Wait for initial render and verify we're on Vim Mode (first setting)
       await waitFor(() => {
         expect(lastFrame()).toContain('Vim Mode');
       });
 
-      // Toggle the setting
+      // Toggle the setting (Vim Mode is the first setting now)
       act(() => {
         stdin.write(TerminalKeys.ENTER as string);
       });