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/utils/VirtualScroller.js

@@ -931,6 +931,38 @@ export class VirtualScroller {
         return true;
     }
 
+    /**
+     * Remove multiple items by their file paths.
+     * More efficient than calling removeItemByFilePath individually.
+     * @param {string[]} filePaths - Array of file paths to remove
+     * @returns {boolean} - True if any items were removed
+     */
+    removeMultipleItemsByFilePath(filePaths) {
+        if (!Array.isArray(filePaths) || filePaths.length === 0 || this.disabled || this.items.length === 0) return false;
+
+        // Build a set for fast lookup
+        const pathsToRemove = new Set(filePaths);
+        const originalLength = this.items.length;
+
+        // Filter out removed items; keep those not in the set
+        this.items = this.items.filter(item => !pathsToRemove.has(item.file_path));
+
+        const removedCount = originalLength - this.items.length;
+        if (removedCount === 0) return false;
+
+        this.totalItems = Math.max(0, this.totalItems - removedCount);
+
+        // Update the spacer height
+        this.updateSpacerHeight();
+
+        // Re-render to fill gaps left by removed items
+        this.clearRenderedItems();
+        this.scheduleRender();
+
+        console.log(`Removed ${removedCount} items from virtual scroller data`);
+        return true;
+    }
+
     // Add keyboard navigation methods
     handlePageUpDown(direction) {
         // Prevent duplicate animations by checking last trigger time