feat: keep ITTO highlight controls sticky

src/pages/IttoCollectionsPage.tsx

@@ -160,6 +160,7 @@ export function IttoCollectionsPage() {
 
   return (
     <div className="space-y-4">
+      <div className="space-y-3 sticky top-20 z-30 rounded-2xl bg-gray-50/95 pb-1 backdrop-blur dark:bg-gray-900/95">
         <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
           <div>
             <h1 className="text-xl font-bold text-gray-900 dark:text-white">输入 · 工具 · 输出</h1>
@@ -201,6 +202,7 @@ export function IttoCollectionsPage() {
             </button>
           </div>
         )}
+      </div>
 
       <motion.div
         key={activeTab}