refactor: cleanup

lib/features/chat/widgets/assistant_message_widget.dart

@@ -198,10 +198,10 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
     String _pretty(dynamic v, {int max = 1200}) {
       try {
         final pretty = const JsonEncoder.withIndent('  ').convert(v);
-        return pretty.length > max ? pretty.substring(0, max) + '\n…' : pretty;
+        return pretty.length > max ? '${pretty.substring(0, max)}\n…' : pretty;
       } catch (_) {
         final s = v?.toString() ?? '';
-        return s.length > max ? s.substring(0, max) + '…' : s;
+        return s.length > max ? '${s.substring(0, max)}…' : s;
       }
     }
 

lib/features/chat/widgets/modern_chat_input.dart

@@ -1164,11 +1164,9 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
       _textSub?.cancel();
       _textSub = stream.listen(
         (text) async {
-          final updated =
-              (_baseTextAtStart.isEmpty
-                  ? ''
-                  : (_baseTextAtStart.trimRight() + ' ')) +
-              text;
+          final updated = _baseTextAtStart.isEmpty
+              ? text
+              : '${_baseTextAtStart.trimRight()} $text';
           _controller.value = TextEditingValue(
             text: updated,
             selection: TextSelection.collapsed(offset: updated.length),