[Notion] Fully automatic check-in heat tracking

✅ Quick check-in: We can quickly check in by clicking the check-in button on the plan, and then the number of check-ins and today's check-in status will be automatically updated.

📊 Data statistics: After each check-in, the data statistics for this week, this month and this year will be automatically calculated to intuitively understand the current check-in data.

🔥 Check-in heat map: After each check-in, the monthly check-in heat will be synchronized and automatically dynamically updated. You can also manually switch the month of the heat map to understand your check-in situation more intelligently, and you can also choose colors according to your preferences.