chore: clean up legacy tool/UI code paths and remove unused events

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

@@ -57,8 +57,6 @@ extension _ChatBlocEvents on ChatBloc {
         _handleToolCallEnd(event as ToolCallEndEvent);
       case AgUiEventType.toolCallResult:
         _handleToolCallResult(event as ToolCallResultEvent);
-      case AgUiEventType.toolCallError:
-        _handleToolCallError(event as ToolCallErrorEvent);
       case AgUiEventType.unknown:
         break;
     }
@@ -89,11 +87,6 @@ extension _ChatBlocEvents on ChatBloc {
       timestamp,
     );
 
-    final uiSchema = event.uiSchema;
-    if (uiSchema != null) {
-      _upsertUiSchema(items, event.messageId, uiSchema, timestamp);
-    }
-
     emit(
       state.copyWith(
         items: _removeToolCallItems(items),
@@ -133,28 +126,6 @@ extension _ChatBlocEvents on ChatBloc {
     return result;
   }
 
-  void _upsertUiSchema(
-    List<ChatListItem> items,
-    String messageId,
-    Map<String, dynamic> uiSchema,
-    DateTime timestamp,
-  ) {
-    final uiItemId = '$messageId-ui';
-    final uiItem = ToolResultItem(
-      id: uiItemId,
-      callId: messageId,
-      uiSchema: uiSchema,
-      timestamp: timestamp,
-      sender: MessageSender.ai,
-    );
-    final existingIndex = items.indexWhere((item) => item.id == uiItemId);
-    if (existingIndex >= 0) {
-      items[existingIndex] = uiItem;
-      return;
-    }
-    items.add(uiItem);
-  }
-
   void _handleToolCallStart(ToolCallStartEvent event) {
     final exists = state.items.any(
       (item) => item is ToolCallItem && item.id == event.toolCallId,
@@ -248,22 +219,6 @@ extension _ChatBlocEvents on ChatBloc {
     items.add(uiItem);
   }
 
-  void _handleToolCallError(ToolCallErrorEvent event) {
-    emit(
-      state.copyWith(
-        items: state.items.map((item) {
-          if (item is ToolCallItem && item.id == event.toolCallId) {
-            return item.copyWith(
-              status: ToolCallStatus.error,
-              errorMessage: event.error,
-            );
-          }
-          return item;
-        }).toList(),
-      ),
-    );
-  }
-
   List<ChatListItem> _removeToolCallItems(List<ChatListItem> items) {
     return items.where((item) => item is! ToolCallItem).toList();
   }