enhancementgood first issueui
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描述
Summary
Provide a basic stats view showing total meditation minutes and sessions per day.
Tasks
- Add Stats screen or section.
- Query aggregates (total minutes, sessions by day).
- Display results in a simple chart or list.
- Update stats after each completed session.
Acceptance Criteria
- Stats view loads without errors (even on empty DB).
- Total minutes and session counts are accurate.
- Stats update after completing a new session.