fix(player): 修复评论输入聚焦时面板消失

lib/core/platform/keyboard_inset.dart

@@ -0,0 +1,48 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+/// Provides the Android IME height even when `adjustNothing` keeps
+/// `MediaQuery.viewInsets` at zero.
+class KeyboardInsetNotifier extends ChangeNotifier {
+  KeyboardInsetNotifier._();
+
+  static final KeyboardInsetNotifier instance = KeyboardInsetNotifier._();
+  static const MethodChannel _channel = MethodChannel(
+    'com.stormg.lumadrama/keyboard',
+  );
+
+  /// Raw physical-pixel inset reported by Android.
+  int _inset = 0;
+  bool _started = false;
+
+  int get value => _inset;
+
+  Future<void> start() async {
+    if (_started || kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
+      return;
+    }
+    _started = true;
+    _channel.setMethodCallHandler((call) async {
+      if (call.method != 'insetsChanged') return;
+      _update(call.arguments);
+    });
+    try {
+      _update(await _channel.invokeMethod<Object?>('get'));
+    } catch (_) {
+      // Tests and non-embedded Android hosts may not provide the channel.
+    }
+  }
+
+  void _update(Object? value) {
+    final next = switch (value) {
+      int value => value,
+      num value => value.round(),
+      _ => 0,
+    };
+    if (next == _inset) return;
+    _inset = next;
+    notifyListeners();
+  }
+}