Matches: compact, collapsible attendance

Opt-outs and late arrivals are merged into one collapsible block with two toggles per player.

The match page used to show two separate player lists: opt-outs and late arrivals, taking up a lot of screen space.

There is now a single Attendance block, collapsed by default, always showing a summary in the header (e.g. "2 opted out · 1 late"). Expanding it shows one list with two toggles per player: Opted out and Late (with minute). A player who opted out cannot be late at the same time.

This gets you to the lineup faster, especially on mobile.