refactored chat data fetching to support separate cache and network callbacks

lib/state/app/modules/chat/bloc/chat_bloc.dart

@@ -1,5 +1,4 @@
 import '../../../../../api/errors/error_mapper.dart';
-import '../../../../../api/marianumcloud/talk/chat/get_chat_response.dart';
 import '../../../infrastructure/loadable_state/loading_error.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
@@ -57,23 +56,35 @@ class ChatBloc extends LoadableHydratedBloc<ChatEvent, ChatState, ChatRepository
     final requestStart = DateTime.now();
     _lastTokenSet = requestStart;
 
+    bool stillCurrent() {
+      if (_lastTokenSet.isAfter(requestStart)) return false;
+      if ((innerState?.currentToken ?? '') != token) return false;
+      return true;
+    }
+
     Object? capturedError;
-    GetChatResponse? response;
     try {
-      response = await repo.data.getChat(
+      await repo.data.getChat(
         token: token,
+        onCacheData: (data) {
+          if (!stillCurrent()) return;
+          // Cache hit: show data immediately but preserve lastFetch — the
+          // cached payload may be stale and we don't want the UI to claim a
+          // fresh fetch just happened.
+          add(Emit((s) => s.copyWith(chatResponse: data)));
+        },
+        onNetworkData: (data) {
+          if (!stillCurrent()) return;
+          add(DataGathered((s) => s.copyWith(chatResponse: data)));
+        },
         onError: (e) => capturedError = e,
       );
     } catch (e) {
       capturedError = e;
     }
 
-    if (_lastTokenSet.isAfter(requestStart)) return;
-    if ((innerState?.currentToken ?? '') != token) return;
+    if (!stillCurrent()) return;
 
-    if (response != null) {
-      add(DataGathered((s) => s.copyWith(chatResponse: response)));
-    }
     if (capturedError != null) {
       add(Error(LoadingError(
         message: errorToUserMessage(capturedError),