feat(agent): add voice input capability and standardize tool naming

- Add voice recording with transcribe endpoint (ASR) for multimodal input
- Android: add RECORD_AUDIO and INTERNET permissions
- Refactor tool naming: frontend tools use 'front.' prefix, backend tools use 'back.'
- Migrate calendar tools: create_calendar_event -> back.mutate/list/delete events
- Add calendar_event_list.v1 and calendar_operation.v1 UI card types
- Update all Flutter and Python tests to match new tool naming conventions
- Add record package dependency for voice recording

apps/lib/features/chat/presentation/bloc/chat_bloc.dart

@@ -2,11 +2,11 @@ import 'dart:convert';
 
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:social_app/core/api/i_api_client.dart';
+import 'package:social_app/core/api/mock_api_client.dart';
 import 'package:social_app/core/di/injection.dart';
 
 import '../../data/models/ag_ui_event.dart';
 import '../../data/models/chat_list_item.dart';
-import '../../data/models/tool_result.dart';
 import '../../data/services/ag_ui_service.dart';
 
 class ChatState {
@@ -57,7 +57,14 @@ class ChatBloc extends Cubit<ChatState> {
 
   ChatBloc({AgUiService? service, IApiClient? apiClient})
     : _service =
-          service ?? AgUiService(apiClient: apiClient ?? sl<IApiClient>()),
+          service ??
+          AgUiService(
+            apiClient:
+                apiClient ??
+                (sl.isRegistered<IApiClient>()
+                    ? sl<IApiClient>()
+                    : MockApiClient()),
+          ),
       super(const ChatState()) {
     _service.onEvent = _handleEvent;
   }
@@ -162,13 +169,10 @@ class ChatBloc extends Cubit<ChatState> {
     _toolCallArgsBuffer.remove(endEvent.toolCallId);
     final updatedItems = state.items.map((item) {
       if (item.id == endEvent.toolCallId && item is ToolCallItem) {
-        final nextStatus = item.toolName == 'navigate_to_route'
+        final nextStatus = item.toolName == 'front.navigate_to_route'
             ? ToolCallStatus.pending
             : ToolCallStatus.executing;
-        return item.copyWith(
-          args: parsedArgs,
-          status: nextStatus,
-        );
+        return item.copyWith(args: parsedArgs, status: nextStatus);
       }
       return item;
     }).toList();
@@ -344,7 +348,10 @@ class ChatBloc extends Cubit<ChatState> {
     }
     final updatedItems = state.items.map((item) {
       if (item is ToolCallItem && item.callId == toolCallId) {
-        return item.copyWith(status: ToolCallStatus.executing, errorMessage: null);
+        return item.copyWith(
+          status: ToolCallStatus.executing,
+          errorMessage: null,
+        );
       }
       return item;
     }).toList();
@@ -365,10 +372,20 @@ class ChatBloc extends Cubit<ChatState> {
         }
         return item;
       }).toList();
-      emit(state.copyWith(items: failedItems, isLoading: false, error: error.toString()));
+      emit(
+        state.copyWith(
+          items: failedItems,
+          isLoading: false,
+          error: error.toString(),
+        ),
+      );
     }
   }
 
+  Future<String> transcribeAudioFile(String filePath) {
+    return _service.transcribeAudio(filePath);
+  }
+
   void clearError() {
     emit(state.copyWith(error: null));
   }