feat(ai-scribe): Improve data & domain layer for ai scribe

lib/features/composer/presentation/composer_controller.dart

@@ -263,8 +263,6 @@ class ComposerController extends BaseController
 
   TransformHtmlEmailContentInteractor get transformHtmlEmailContentInteractor => _transformHtmlEmailContentInteractor;
 
-  GenerateAITextInteractor get generateAITextInteractor => Get.find<GenerateAITextInteractor>();
-
   String get ownEmailAddress =>
       mailboxDashBoardController.ownEmailAddress.value;
 

lib/features/composer/presentation/extensions/ai_scribe/handle_ai_scribe_in_composer_extension.dart

@@ -10,10 +10,11 @@ import 'package:tmail_ui_user/features/composer/presentation/mixin/text_selectio
 
 extension HandleAiScribeInComposerExtension on ComposerController {
   bool get isAIScribeAvailable {
-    return isAICapabilitySupported(
+    final aiCapability = getAICapability(
       session: mailboxDashBoardController.sessionCurrent,
       accountId: mailboxDashBoardController.accountId.value,
     );
+    return aiCapability?.isScribeEndpointAvailable == true;
   }
 
   Future<String> _getTextOnlyContentInEditor() async {