added verbose error body in case of errors

lib/api/marianumcloud/talk/talk_api.dart

@@ -60,7 +60,15 @@ abstract class TalkApi<T extends ApiResponse?> extends ApiRequest {
 
     final status = data.statusCode;
     if (status < 200 || status >= 300) {
-      final detail = 'Talk $endpoint -> HTTP $status';
+      // Talk's OCS errors put the real reason in the response body (e.g.
+      // expired session, removed participant, malformed reply target).
+      // Include a trimmed preview so the in-app error dialog and logs
+      // surface the cause instead of just the bare status code.
+      final body = data.body.replaceAll(RegExp(r'\s+'), ' ').trim();
+      final preview = body.length > 500 ? '${body.substring(0, 500)}…' : body;
+      final detail = body.isEmpty
+          ? 'Talk $endpoint -> HTTP $status'
+          : 'Talk $endpoint -> HTTP $status body=$preview';
       log(detail);
       if (status == 401) {
         throw AuthException.unauthorized(technicalDetails: detail);

lib/view/pages/talk/chat_view.dart

@@ -189,9 +189,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     setState(() {
       _activeMatchIndex = (_activeMatchIndex + 1) % _matches.length;
     });
-    WidgetsBinding.instance.addPostFrameCallback(
-      (_) => _scrollToActiveMatch(),
-    );
+    WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToActiveMatch());
   }
 
   void _goToNextMatch() {
@@ -200,9 +198,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
       _activeMatchIndex =
           (_activeMatchIndex - 1 + _matches.length) % _matches.length;
     });
-    WidgetsBinding.instance.addPostFrameCallback(
-      (_) => _scrollToActiveMatch(),
-    );
+    WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToActiveMatch());
   }
 
   void _scrollToActiveMatch() {
@@ -230,8 +226,9 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     final activeId = _matches.isNotEmpty
         ? _matches[_activeMatchIndex].messageId
         : null;
-    final highlightQuery =
-        _searchActive && _searchQuery.trim().isNotEmpty ? _searchQuery : null;
+    final highlightQuery = _searchActive && _searchQuery.trim().isNotEmpty
+        ? _searchQuery
+        : null;
 
     final messages = <Widget>[];
     final chronologicalMatchIndex = <int, int>{};
@@ -320,7 +317,19 @@ class _ChatViewState extends State<ChatView> with RouteAware {
   }
 
   @override
-  Widget build(BuildContext context) => Scaffold(
+  Widget build(BuildContext context) {
+    // Swallow the first back gesture while the keyboard is visible so it
+    // dismisses the IME instead of popping the chat — matches platform UX
+    // expectations (e.g. WhatsApp/Telegram) and prevents accidental exits
+    // mid-typing.
+    final keyboardOpen = MediaQuery.viewInsetsOf(context).bottom > 0;
+    return PopScope(
+      canPop: !keyboardOpen,
+      onPopInvokedWithResult: (didPop, _) {
+        if (didPop) return;
+        FocusManager.instance.primaryFocus?.unfocus();
+      },
+      child: Scaffold(
         backgroundColor: const Color(0xffefeae2),
         appBar: _searchActive
             ? ChatSearchAppBar(
@@ -377,8 +386,9 @@ class _ChatViewState extends State<ChatView> with RouteAware {
                       state.currentToken == widget.room.token,
                   enablePullToRefresh: false,
                   child: (state, _) {
-                final items =
-                    _buildMessages(state.chatResponse!).reversed.toList();
+                    final items = _buildMessages(
+                      state.chatResponse!,
+                    ).reversed.toList();
                     return ScrollablePositionedList.builder(
                       reverse: true,
                       itemScrollController: _itemScrollController,
@@ -402,5 +412,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
             ],
           ),
         ),
+      ),
     );
   }
+}

lib/view/pages/talk/widgets/chat_textfield.dart

@@ -110,17 +110,27 @@ class _ChatTextfieldState extends State<ChatTextfield> {
     if (_textBoxController.text.isEmpty) return;
     final text = _textBoxController.text;
     final replyTo = chatBloc.state.data?.referenceMessageId?.toString();
+    final ownToken = widget.sendToToken;
     setState(() => _sendError = null);
     await SendMessage(
-      widget.sendToToken,
+      ownToken,
       SendMessageParams(text, replyTo: replyTo),
     ).run();
-    if (!mounted) return;
-    chatBloc.refresh();
-    _textBoxController.text = '';
+    // Reached only on success — SendMessage.run() throws on failure and
+    // skips this block, leaving the persisted draft as a recovery aid.
+    // Drafts live on the global SettingsCubit keyed by token, so clear
+    // them even when the user navigated away mid-send — otherwise the
+    // sent message lingers as a phantom draft on the chat list.
     _setDraft('');
-    chatBloc.setReferenceMessageId(null);
     _setDraftReply(null);
+    // The global ChatBloc may already point at a different chat (user
+    // switched mid-send); only touch it while it still references us.
+    if (chatBloc.state.data?.currentToken == ownToken) {
+      chatBloc.setReferenceMessageId(null);
+      chatBloc.refresh();
+    }
+    if (!mounted) return;
+    _textBoxController.text = '';
   }
 
   @override