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/data/models/ag_ui_event.dart

@@ -297,6 +297,14 @@ class ToolCallResultEvent extends AgUiEvent {
     if (rawUi is Map<String, dynamic>) {
       return UiCard.fromJson(rawUi);
     }
+    final rawResult = payload['result'];
+    if (rawResult is Map<String, dynamic>) {
+      final type = rawResult['type'];
+      final data = rawResult['data'];
+      if (type is String && data is Map<String, dynamic>) {
+        return UiCard.fromJson(rawResult);
+      }
+    }
     return null;
   }