使用CSS样式实现滚动条美化

- 改用style标签实现滚动条样式
- 确保样式正确生效

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

components/agents/AgentPsdTemplateEditorDialog.tsx

@@ -795,7 +795,24 @@ export function AgentPsdTemplateEditorDialog({
   }
 
   return (
-    <Dialog open={open} onOpenChange={onOpenChange}>
+    <>
+      <style jsx>{`
+        .psd-preview-viewport::-webkit-scrollbar {
+          width: 8px;
+          height: 8px;
+        }
+        .psd-preview-viewport::-webkit-scrollbar-track {
+          background: transparent;
+        }
+        .psd-preview-viewport::-webkit-scrollbar-thumb {
+          background: rgba(255, 255, 255, 0.2);
+          border-radius: 4px;
+        }
+        .psd-preview-viewport::-webkit-scrollbar-thumb:hover {
+          background: rgba(255, 255, 255, 0.3);
+        }
+      `}</style>
+      <Dialog open={open} onOpenChange={onOpenChange}>
       <DialogContent
         overlayClassName="bg-black/85 backdrop-blur-sm"
         className="flex h-[92vh] w-[96vw] max-w-[1700px] flex-col overflow-hidden border border-white/10 bg-[#09090b] p-0 text-white shadow-[0_30px_120px_rgba(0,0,0,0.65)]"
@@ -902,7 +919,7 @@ export function AgentPsdTemplateEditorDialog({
 
             <div
               ref={previewViewportRef}
-              className="relative flex min-h-0 flex-1 items-center justify-center overflow-auto rounded-2xl border border-white/10 bg-[#111114] p-4 [&::-webkit-scrollbar]:w-2 [&::-webkit-scrollbar]:h-2 [&::-webkit-scrollbar-track]:bg-transparent [&::-webkit-scrollbar-thumb]:rounded-full [&::-webkit-scrollbar-thumb]:bg-white/20 hover:[&::-webkit-scrollbar-thumb]:bg-white/30"
+              className="psd-preview-viewport relative flex min-h-0 flex-1 items-center justify-center overflow-auto rounded-2xl border border-white/10 bg-[#111114] p-4"
             >
               {selectedTemplate ? (
                 <div