Fix quick-capture dialog controller disposal race

lib/features/people/people_view.dart

@@ -672,39 +672,12 @@ class PeopleView extends ConsumerWidget {
     required String title,
     required String hintText,
   }) async {
-    final TextEditingController controller = TextEditingController();
-    final String? result = await showDialog<String>(
+    return showDialog<String>(
       context: context,
       builder: (BuildContext context) {
-        return AlertDialog(
-          title: Text(title),
-          content: TextField(
-            controller: controller,
-            minLines: 2,
-            maxLines: 4,
-            decoration: InputDecoration(hintText: hintText),
-          ),
-          actions: <Widget>[
-            TextButton(
-              onPressed: () => Navigator.of(context).pop(),
-              child: const Text('Cancel'),
-            ),
-            FilledButton(
-              onPressed: () {
-                final String value = controller.text.trim();
-                if (value.isEmpty) {
-                  return;
-                }
-                Navigator.of(context).pop(value);
-              },
-              child: const Text('Save'),
-            ),
-          ],
-        );
+        return _QuickTextCaptureDialog(title: title, hintText: hintText);
       },
     );
-    controller.dispose();
-    return result;
   }
 }
 
@@ -2046,6 +2019,76 @@ class _PersonEditorDialog extends StatelessWidget {
   }
 }
 
+class _QuickTextCaptureDialog extends StatefulWidget {
+  const _QuickTextCaptureDialog({required this.title, required this.hintText});
+
+  final String title;
+  final String hintText;
+
+  @override
+  State<_QuickTextCaptureDialog> createState() =>
+      _QuickTextCaptureDialogState();
+}
+
+class _QuickTextCaptureDialogState extends State<_QuickTextCaptureDialog> {
+  late final TextEditingController _controller;
+  bool _attemptedSubmit = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = TextEditingController();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final String value = _controller.text.trim();
+    return AlertDialog(
+      title: Text(widget.title),
+      content: TextField(
+        controller: _controller,
+        minLines: 2,
+        maxLines: 4,
+        autofocus: true,
+        onChanged: (_) {
+          if (_attemptedSubmit) {
+            setState(() {});
+          }
+        },
+        decoration: InputDecoration(
+          hintText: widget.hintText,
+          errorText: _attemptedSubmit && value.isEmpty ? 'Required' : null,
+        ),
+      ),
+      actions: <Widget>[
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Cancel'),
+        ),
+        FilledButton(
+          onPressed: () {
+            final String submitted = _controller.text.trim();
+            if (submitted.isEmpty) {
+              setState(() {
+                _attemptedSubmit = true;
+              });
+              return;
+            }
+            Navigator.of(context).pop(submitted);
+          },
+          child: const Text('Save'),
+        ),
+      ],
+    );
+  }
+}
+
 class _PersonEditorBottomSheet extends StatelessWidget {
   const _PersonEditorBottomSheet({
     required this.title,