Extract the Week view's calendar-week badge into a shared ui/common component and reuse it for the Month grid's week-number gutter, so the two views show week numbers in the exact same format. The gutter now centres the badge vertically in each row (was pinned to the day-number band) and is widened to seat the badge. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>