implemented keyboard-aware back navigation and refined message sending logic to prevent phantom drafts and handle mid-send navigation

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