feat(ai-scribe): reorganize abstractions and update dialog modal UI

lib/features/composer/presentation/widgets/mobile/mobile_editor_widget.dart

@@ -5,7 +5,7 @@ import 'package:core/utils/platform_info.dart';
 import 'package:core/utils/html/html_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:rich_text_composer/rich_text_composer.dart';
-import 'package:tmail_ui_user/features/composer/presentation/widgets/mixins/text_selection_mixin.dart';
+import 'package:tmail_ui_user/features/composer/presentation/mixin/text_selection_mixin.dart';
 
 typedef OnCreatedEditorAction = Function(BuildContext context, HtmlEditorApi editorApi, String content);
 typedef OnLoadCompletedEditorAction = Function(HtmlEditorApi editorApi, WebUri? url);

lib/features/composer/presentation/widgets/mobile/tablet_bottom_bar_composer_widget.dart

@@ -1,6 +1,7 @@
 import 'package:core/presentation/resources/image_paths.dart';
 import 'package:core/presentation/views/button/tmail_button_widget.dart';
 import 'package:flutter/material.dart';
+import 'package:scribe/scribe/ai/presentation/widgets/button/ai_assistant_button.dart';
 import 'package:tmail_ui_user/features/composer/presentation/styles/mobile/tablet_bottom_bar_composer_widget_style.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 
@@ -14,8 +15,7 @@ class TabletBottomBarComposerWidget extends StatelessWidget {
   final VoidCallback sendMessageAction;
   final VoidCallback requestReadReceiptAction;
   final VoidCallback toggleMarkAsImportantAction;
-  final VoidCallback? onOpenAIScribe;
-  final GlobalKey? aiScribeButtonKey;
+  final OnOpenAiAssistantModal? onOpenAiAssistantModal;
 
   const TabletBottomBarComposerWidget({
     super.key,
@@ -27,8 +27,7 @@ class TabletBottomBarComposerWidget extends StatelessWidget {
     required this.sendMessageAction,
     required this.requestReadReceiptAction,
     required this.toggleMarkAsImportantAction,
-    this.onOpenAIScribe,
-    this.aiScribeButtonKey,
+    this.onOpenAiAssistantModal,
   });
 
   @override
@@ -75,18 +74,14 @@ class TabletBottomBarComposerWidget extends StatelessWidget {
               : AppLocalizations.of(context).turnOnRequestReadReceipt,
             onTapActionCallback: requestReadReceiptAction,
           ),
-          if (onOpenAIScribe != null) ...[
-            const SizedBox(width: TabletBottomBarComposerWidgetStyle.space),
-            TMailButtonWidget.fromIcon(
-              key: aiScribeButtonKey,
-              icon: imagePaths.icSparkle,
-              borderRadius: TabletBottomBarComposerWidgetStyle.iconRadius,
-              padding: TabletBottomBarComposerWidgetStyle.iconPadding,
-              iconSize: TabletBottomBarComposerWidgetStyle.iconSize,
-              tooltipMessage: AppLocalizations.of(context).aiAssistant,
-              onTapActionCallback: onOpenAIScribe!,
+          if (onOpenAiAssistantModal != null)
+            AiAssistantButton(
+              imagePaths: imagePaths,
+              margin: const EdgeInsetsDirectional.only(
+                start: TabletBottomBarComposerWidgetStyle.space,
+              ),
+              onOpenAiAssistantModal: onOpenAiAssistantModal!,
             ),
-          ],
           const SizedBox(width: TabletBottomBarComposerWidgetStyle.space),
           TMailButtonWidget.fromIcon(
             icon: imagePaths.icSaveToDraft,