Auto-recover native player after Source errors.

Screen-off and network switches often leave ExoPlayer dead without a 4xx status; refresh automatically (and on app resume) instead of waiting for Reload.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/screens/channel/video/playback_error_recovery_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:frosty/screens/channel/video/playback_error_recovery.dart';
+import 'package:frosty/screens/channel/video/video_timing_constants.dart';
+
+void main() {
+  group('shouldAutoRecoverFromPlayerError', () {
+    test('recovers Source error / generic failures under the refresh cap', () {
+      expect(
+        shouldAutoRecoverFromPlayerError(refreshCapReached: false),
+        isTrue,
+      );
+      expect(
+        shouldAutoRecoverFromPlayerError(
+          refreshCapReached: false,
+          errorCode: null,
+        ),
+        isTrue,
+      );
+    });
+
+    test('stops once the refresh cap is reached', () {
+      expect(
+        shouldAutoRecoverFromPlayerError(refreshCapReached: true),
+        isFalse,
+      );
+    });
+
+    test('defers mediaServicesWereReset to its dedicated rebuild path', () {
+      expect(
+        shouldAutoRecoverFromPlayerError(
+          refreshCapReached: false,
+          errorCode: 'mediaServicesWereReset',
+        ),
+        isFalse,
+      );
+    });
+  });
+
+  group('playerErrorRetryDelay', () {
+    test('refreshes 4xx token failures immediately', () {
+      expect(playerErrorRetryDelay(statusCode: 403), Duration.zero);
+      expect(playerErrorRetryDelay(statusCode: 404), Duration.zero);
+    });
+
+    test('waits briefly for network / Source errors without status', () {
+      expect(
+        playerErrorRetryDelay(),
+        VideoTimingConstants.initRetryDelay,
+      );
+      expect(
+        playerErrorRetryDelay(statusCode: 500),
+        VideoTimingConstants.initRetryDelay,
+      );
+    });
+  });
+}