fix: keep owned asset in iOS shared album in Free Up Space

mobile/lib/infrastructure/repositories/local_asset.repository.dart

@@ -144,16 +144,13 @@ class DriftLocalAssetRepository extends DriftDatabaseRepository {
     bool keepFavorites = true,
     Set<String> keepAlbumIds = const {},
   }) async {
+    final iosSharedAlbumIds = _db.localAlbumEntity.selectOnly()
+      ..addColumns([_db.localAlbumEntity.id])
+      ..where(_db.localAlbumEntity.isIosSharedAlbum.equals(true));
+
     final iosSharedAlbumAssets = _db.localAlbumAssetEntity.selectOnly()
       ..addColumns([_db.localAlbumAssetEntity.assetId])
-      ..join([
-        innerJoin(
-          _db.localAlbumEntity,
-          _db.localAlbumAssetEntity.albumId.equalsExp(_db.localAlbumEntity.id),
-          useColumns: false,
-        ),
-      ])
-      ..where(_db.localAlbumEntity.isIosSharedAlbum.equals(true));
+      ..where(_db.localAlbumAssetEntity.albumId.isInQuery(iosSharedAlbumIds));
 
     final query = _db.localAssetEntity.select().join([
       innerJoin(_db.remoteAssetEntity, _db.localAssetEntity.checksum.equalsExp(_db.remoteAssetEntity.checksum)),

mobile/test/infrastructure/repositories/local_asset_repository_test.dart

@@ -438,6 +438,39 @@ void main() {
       expect(result.assets, isEmpty);
     });
 
+    test('excludes user-owned assets in iOS shared albums', () async {
+      await insertLocalAlbum(id: 'album-recents', name: 'Recents', isIosSharedAlbum: false);
+
+      await insertLocalAlbum(id: 'album-shared', name: 'Shared Album', isIosSharedAlbum: true);
+
+      await insertLocalAsset(
+        id: 'local-user-shared',
+        checksum: 'checksum-user-shared',
+        createdAt: beforeCutoff,
+        type: AssetType.image,
+        isFavorite: false,
+      );
+      await insertRemoteAsset(id: 'remote-user-shared', checksum: 'checksum-user-shared', ownerId: userId);
+      await insertLocalAlbumAsset(albumId: 'album-recents', assetId: 'local-user-shared');
+      await insertLocalAlbumAsset(albumId: 'album-shared', assetId: 'local-user-shared');
+
+      // User's asset only in Recents (not in iOS shared album) - should be included for removal
+      await insertLocalAsset(
+        id: 'local-user-regular',
+        checksum: 'checksum-user-regular',
+        createdAt: beforeCutoff,
+        type: AssetType.image,
+        isFavorite: false,
+      );
+      await insertRemoteAsset(id: 'remote-user-regular', checksum: 'checksum-user-regular', ownerId: userId);
+      await insertLocalAlbumAsset(albumId: 'album-recents', assetId: 'local-user-regular');
+
+      final result = await repository.getRemovalCandidates(userId, cutoffDate);
+
+      expect(result.assets.length, 1);
+      expect(result.assets[0].id, 'local-user-regular');
+    });
+
     test('excludes assets with null checksum (not backed up)', () async {
       // Asset with null checksum cannot be matched to remote asset
       await db