体验: 滚动条加深与选中行区分，文件列表表头固定不随滚动且横向滚动条贴可视区底部

Co-authored-by: Cursor <cursoragent@cursor.com>

mactfsui/app/components/explorer/folder-items-panel.tsx

@@ -153,7 +153,8 @@ export function FolderItemsPanel({
       </div>
 
       <FileTargetMenu target={currentFolderTarget} onAction={onFileAction}>
-      <div className="min-h-0 flex-1 overflow-auto">
+      {/* 由 table-container 自身承担纵横滚动：表头 sticky 不随内容滚走，横向滚动条始终贴可视区底部 */}
+      <div className="min-h-0 flex-1 overflow-hidden [&_[data-slot=table-container]]:h-full [&_[data-slot=table-container]]:overflow-auto">
         {loading ? (
           <ItemsSkeleton />
         ) : error ? (

mactfsui/app/components/ui/scroll-area.tsx

@@ -44,7 +44,7 @@ function ScrollBar({
     >
       <ScrollAreaPrimitive.ScrollAreaThumb
         data-slot="scroll-area-thumb"
-        className="relative flex-1 rounded-full bg-border"
+        className="relative flex-1 rounded-full bg-foreground/25 transition-colors hover:bg-foreground/40"
       />
     </ScrollAreaPrimitive.ScrollAreaScrollbar>
   )