fix(virtual-scroll): avoid full reload on move-to-folder, scroll to top on filter/page reset

- MoveManager/SidebarManager: replace resetAndReload with in-place
  VirtualScroller update after move operations (remove non-visible,
  update visible items' file_path). Preserves scroll position and
  avoids empty grid.
- VirtualScroller: add removeMultipleItemsByFilePath for efficient
  batch removal with Array.isArray guard.
- baseModelApi: scroll to top on loadMoreWithVirtualScroll(true),
  covering filter/sort/search/folder/views changes.
- SidebarManager selectFolder: scroll now handled centrally.

static/js/api/baseModelApi.js

@@ -133,6 +133,16 @@ export class BaseModelApiClient {
             pageState.hasMore = result.hasMore;
             pageState.currentPage = pageState.currentPage + 1;
 
+            // When resetting to page 1, scroll back to the top
+            // This covers: folder selection, filter/sort/search changes,
+            // favorites/update/excluded view toggles, alphabet filter, etc.
+            if (resetPage) {
+                const scrollContainer = document.querySelector('.page-content');
+                if (scrollContainer) {
+                    scrollContainer.scrollTop = 0;
+                }
+            }
+
             if (updateFolders) {
                 sidebarManager.refresh();
             }