fix: remove folder intro panels across surfaces

src/app/conversations/folders/[folderKey]/page.tsx

@@ -32,18 +32,6 @@ export default async function ConversationFolderPage({
       ) : null}
       <StatusBar />
       <PageNav title={folder?.folderLabel ?? "项目线程"} backHref="/conversations" />
-      <div className="space-y-3 px-[18px] pb-6">
-        <div className="rounded-2xl border border-[#E5E5EA] bg-white px-4 py-4">
-          <div className="text-[16px] font-semibold text-[#111111]">
-            {folder?.folderLabel ?? "未命名项目"}
-          </div>
-          <div className="mt-2 text-[13px] leading-6 text-[#57606A]">
-            {folder
-              ? `${folder.deviceName ?? "当前设备"} · ${folder.threadCount} 个线程`
-              : "当前项目下没有可显示的线程。"}
-          </div>
-        </div>
-      </div>
       {folder ? (
         <ConversationList conversations={folder.threads} />
       ) : (