fix(video): iOS video zoom

test/services/video_filter_manager_test.dart

@@ -4,6 +4,48 @@ import 'package:plezy/mpv/mpv.dart';
 import 'package:plezy/services/video_filter_manager.dart';
 
 void main() {
+  test('zoom scale snaps to whole percentages', () {
+    final player = _RecordingPlayer();
+    final manager = VideoFilterManager(player: player, availableVersions: const [], selectedMediaIndex: 0);
+    addTearDown(manager.dispose);
+
+    expect(manager.setZoomScale(1.234), 1.23);
+    expect(manager.zoomScale, 1.23);
+
+    expect(manager.adjustZoom(VideoFilterManager.zoomStep), 1.24);
+    expect(manager.zoomScale, 1.24);
+  });
+
+  test('zoom scale snaps near 100 percent to exact default', () {
+    final player = _RecordingPlayer();
+    final manager = VideoFilterManager(player: player, availableVersions: const [], selectedMediaIndex: 0);
+    addTearDown(manager.dispose);
+
+    manager.setZoomScale(1.5);
+
+    expect(manager.setZoomScale(1.00008), 1.0);
+    expect(manager.zoomScale, 1.0);
+    expect(manager.resetZoom(), 1.0);
+  });
+
+  test('video zoom property is exact zero at normalized default', () async {
+    final player = _RecordingPlayer();
+    final manager = VideoFilterManager(player: player, availableVersions: const [], selectedMediaIndex: 0);
+    addTearDown(manager.dispose);
+
+    expect(VideoFilterManager.videoZoomPropertyForScale(1.00008), 0.0);
+
+    manager.setZoomScale(1.00008);
+    await Future<void>.delayed(Duration.zero);
+    player.writes.clear();
+
+    await manager.updateVideoFilter();
+
+    final zoomWrites = player.writes.where((write) => write.key == 'video-zoom').toList();
+    expect(zoomWrites, isNotEmpty);
+    expect(zoomWrites.last.value, '0.0');
+  });
+
   test('stretch mode applies the initial player size before a resize event', () async {
     final player = _RecordingPlayer();
     final manager = VideoFilterManager(