feat(mobile): add playbackStyle to native sync API (#26541)

* feat(mobile): add playbackStyle to native sync API

Adds a `playbackStyle` field to `PlatformAsset` in the pigeon sync API so
native platforms can communicate the asset's playback style (image, video,
animated, livePhoto) to Flutter during sync.

- Add `playbackStyleValue` computed property to `PHAsset` extension (iOS)
- Populate `playbackStyle` in `toPlatformAsset()` and the full-sync path
- Update generated Dart/Kotlin/Swift files

* fix(tests): add playbackStyle to local asset test cases

* fix(tests): update playbackStyle to use integer values in local sync tests

* feat(mobile): extend playbackStyle enum to include videoLooping

* Update PHAssetExtensions.swift

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix(playback): simplify playbackStyleValue implementation by removing iOS version check

* feat(android): implement proper playbackStyle detection

* add PlatformAssetPlaybackStyle enum

* linting

---------

Co-authored-by: Mert <101130780+mertalev@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

mobile/test/domain/services/local_sync_service_test.dart

@@ -131,6 +131,7 @@ void main() {
         durationInSeconds: 0,
         orientation: 0,
         isFavorite: false,
+        playbackStyle: PlatformAssetPlaybackStyle.image
       );
 
       final assetsToRestore = [LocalAssetStub.image1];
@@ -214,6 +215,7 @@ void main() {
         isFavorite: false,
         createdAt: 1700000000,
         updatedAt: 1732000000,
+        playbackStyle: PlatformAssetPlaybackStyle.image
       );
 
       final localAsset = platformAsset.toLocalAsset();