Bookings & check-ins — buttons that actually work

Two client buttons that looked functional but did nothing now work for real:

• Reschedule opens your coach's actual availability — pick a day, pick a real open time, and the session moves (your coach's calendar updates too).
• Weekly check-in. Writing how your week went and hitting Submit now saves it and sends it to your coach, where it appears in your check-in history. Previously the text was silently discarded.