fix(mobile): do not removed not backup asset when selecting the correspond options (#13256)

* fixed the local ids selecting issue

* code: updated impl inside deleteLocalOnlyAssets

* fix: used png instead of jpg to maintain picture quality

* Revert "fix: used png instead of jpg to maintain picture quality"

This reverts commit 04f2ed54e4.

* fix: update logic from code-review perspective

* refractor (mobile) : Dart fix applied

* fix (mobile) : Updated multi grid as per requirement

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/widgets/asset_grid/multiselect_grid.dart

@@ -203,18 +203,30 @@ class MultiselectGrid extends HookConsumerWidget {
     void onDeleteLocal(bool onlyBackedUp) async {
       processing.value = true;
       try {
+        // Select only the local assets from the selection
         final localIds = selection.value.where((a) => a.isLocal).toList();
 
+        // Delete only the backed-up assets if 'onlyBackedUp' is true
         final isDeleted = await ref
             .read(assetProvider.notifier)
             .deleteLocalOnlyAssets(localIds, onlyBackedUp: onlyBackedUp);
+
         if (isDeleted) {
+          // Show a toast with the correct number of deleted assets
+          final deletedCount = localIds
+              .where(
+                (e) => !onlyBackedUp || e.isRemote,
+              ) // Only count backed-up assets
+              .length;
+
           ImmichToast.show(
             context: context,
             msg: 'assets_removed_permanently_from_device'
-                .tr(args: ["${localIds.length}"]),
+                .tr(args: ["$deletedCount"]),
             gravity: ToastGravity.BOTTOM,
           );
+
+          // Reset the selection
           selectionEnabledHook.value = false;
         }
       } finally {