Remove previewFeatures and default to Gemini 3 (#18414)

packages/cli/src/config/settingsSchema.ts

@@ -162,15 +162,6 @@ const SETTINGS_SCHEMA = {
     description: 'General application settings.',
     showInDialog: false,
     properties: {
-      previewFeatures: {
-        type: 'boolean',
-        label: 'Preview Features (e.g., models)',
-        category: 'General',
-        requiresRestart: false,
-        default: false,
-        description: 'Enable preview features (e.g., preview models).',
-        showInDialog: true,
-      },
       preferredEditor: {
         type: 'string',
         label: 'Preferred Editor',