feat: add batch pause/resume controls and improve batch toolbar usability

vite-frontend/src/pages/node.tsx

@@ -1032,11 +1032,11 @@ export default function NodePage() {
 
       {/* 批量操作浮动工具栏 */}
       {selectMode && selectedIds.size > 0 && (
-        <div className="fixed bottom-6 left-1/2 -translate-x-1/2 z-50 bg-content1 shadow-lg rounded-full px-6 py-3 flex items-center gap-4 border border-divider">
-          <span className="text-sm font-medium">
-            已选 {selectedIds.size} 项
-          </span>
-          <div className="flex gap-2">
+        <div className="fixed bottom-7 left-1/2 z-50 w-[calc(100vw-1rem)] max-w-max -translate-x-1/2 overflow-x-auto rounded-lg border border-divider bg-content1 p-2 shadow-lg">
+          <div className="flex min-w-max items-center gap-2">
+            <span className="text-sm font-medium shrink-0">
+              已选 {selectedIds.size} 项
+            </span>
             <Button size="sm" variant="flat" onPress={selectAll}>
               全选
             </Button>