学习概览日历可查看当日语法检测+跟读录音;修复跟读录音签名

- 学习概览选中某天展示:打卡任务+英语语法检测(分数)+单词跟读录音(回放)
- 修复跟读录音无法听:Safari 录音为 audio/mp4,原写死 audio/webm 致签名
  不匹配上传失败;改为按实际录音类型签名,扩展名 m4a/webm

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

src/app/parent/dashboard.tsx

@@ -16,6 +16,8 @@ export type DayCell = {
   grammar: number;
   weekly: number | null;
   tasks: { title: string; status: "pending" | "done"; subject: string }[];
+  recs: { word: string; url: string }[];
+  gtests: { title: string; score: number; passed: boolean }[];
 };
 export type OverviewData = {
   kids: {