fix(mobile): back button while multiselecting showing the last selected image (#1521)

mobile/lib/modules/home/ui/asset_grid/immich_asset_grid.dart

@@ -224,13 +224,28 @@ class ImmichAssetGridState extends State<ImmichAssetGrid> {
     }
   }
 
+
+  Future<bool> onWillPop() async {
+    if (widget.selectionActive && _selectedAssets.isNotEmpty) {
+      _deselectAll();
+      return false;
+    }
+
+    return true;
+  }
+
+
+
   @override
   Widget build(BuildContext context) {
-    return Stack(
+    return WillPopScope(
+      onWillPop: onWillPop,
+      child: Stack(
         children: [
           _buildAssetGrid(),
           if (widget.selectionActive) _buildMultiSelectIndicator(),
         ],
+      ),
     );
   }
 }

mobile/lib/modules/home/views/home_page.dart

@@ -200,18 +200,7 @@ class HomePage extends HookConsumerWidget {
         );
       }
 
-      Future<bool> onWillPop() async {
+      return SafeArea(
-        if (multiselectEnabled.state) {
-          selectionEnabledHook.value = false;
-          return false;
-        }
-
-        return true;
-      }
-
-      return WillPopScope(
-        onWillPop: onWillPop,
-        child: SafeArea(
         bottom: !multiselectEnabled.state,
         top: true,
         child: Stack(
@@ -240,7 +229,6 @@ class HomePage extends HookConsumerWidget {
               ),
           ],
         ),
-        ),
       );
     }