录音回放改为单个播放按钮(无进度条),与单词读音一致

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/parent/dashboard.tsx

@@ -9,6 +9,7 @@ import { ChildManage } from "./child-manage";
 import { DevicesTab } from "./devices-tab";
 import { OverviewTab } from "./overview-tab";
 import { TemplatesTab } from "./templates-tab";
+import { PlayBtn } from "@/components/play-audio";
 
 export type DayCell = {
   done: number;
@@ -156,7 +157,7 @@ export function ParentDashboard({
                     <div key={i} className="flex items-center gap-2 text-sm">
                       <span className="w-16 shrink-0 text-xs text-muted-foreground">{r.childName}</span>
                       <span className="w-20 shrink-0 font-medium text-slate-800">{r.word}</span>
-                      <audio controls src={r.url} className="h-8 flex-1" />
+                      <PlayBtn src={r.url} />
                     </div>
                   ))}
                 </div>