Replace internal rowHeightPx measurement with external rowHeightPx
parameter passed from CalendarMonthView. This eliminates the mismatch
between outer gridHeightPx (based on shrinking container) and inner
totalHeightDp (based on independently measured row height), which was
causing visual jitter during collapse animation.
Remove onRowHeightMeasured callback, TAG constant, and debug printlns
from CalendarMonthPage as part of this refactor.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>