Hide scroll handle for lists < 100 assets

mobile/lib/modules/home/ui/asset_list_v2/immich_asset_grid.dart

@@ -136,10 +136,13 @@ class ImmichAssetGrid extends HookConsumerWidget {
     );
   }
 
+
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final scrolling = useState(false);
 
+    final useDragScrolling = _assets.length > 100;
+
     void dragScrolling(bool active) {
       scrolling.value = active;
     }
@@ -148,6 +151,17 @@ class ImmichAssetGrid extends HookConsumerWidget {
       return _itemBuilder(c, position, scrolling.value);
     }
 
+    final listWidget = ScrollablePositionedList.builder(
+      itemBuilder: itemBuilder,
+      itemPositionsListener: _itemPositionsListener,
+      itemScrollController: _itemScrollController,
+      itemCount: renderList.length,
+    );
+
+    if (!useDragScrolling) {
+      return listWidget;
+    }
+
     return DraggableScrollbar.semicircle(
         scrollStateListener: dragScrolling,
         itemPositionsListener: _itemPositionsListener,
@@ -157,11 +171,7 @@ class ImmichAssetGrid extends HookConsumerWidget {
         labelConstraints: const BoxConstraints(maxHeight: 28),
         scrollbarAnimationDuration: const Duration(seconds: 1),
         scrollbarTimeToFade: const Duration(seconds: 4),
-        child: ScrollablePositionedList.builder(
+        child: listWidget,
-          itemBuilder: itemBuilder,
+    );
-          itemPositionsListener: _itemPositionsListener,
-          itemScrollController: _itemScrollController,
-          itemCount: renderList.length,
-        ));
   }
 }