修复素材批量栏网格列数

为下载、删除和取消按钮定义三条等宽显式列轨

避免窄侧栏生成尺寸不一致的隐式列

src/components/image-editor/ImageCanvasAssetLibraryPanelView.tsx

@@ -263,7 +263,7 @@ export function ImageCanvasAssetLibraryPanelView({
       </div>
       {isAssetSelectionMode ? (
         <PlatformBatchActionToolbar
-          className="static! left-auto! bottom-auto! grid! w-full! max-w-none! transform-none! grid-cols-2! gap-1.5! overflow-hidden! rounded-none! border-x-0! border-b-0! px-2.5! pt-2.5! pb-[calc(0.55rem+env(safe-area-inset-bottom,0px))]! shadow-[0_-8px_22px_rgba(15,23,42,0.08)]!"
+          className="static! left-auto! bottom-auto! grid! w-full! max-w-none! transform-none! grid-cols-3! gap-1.5! overflow-hidden! rounded-none! border-x-0! border-b-0! px-2.5! pt-2.5! pb-[calc(0.55rem+env(safe-area-inset-bottom,0px))]! shadow-[0_-8px_22px_rgba(15,23,42,0.08)]!"
           label="素材批量操作"
         >
           <PlatformActionButton