Number keys 1-0 watch a player, but the only hint was a hover tooltip.
Each roster row now carries its key at the left edge, muted at rest and
bright while the row is hovered or watched. The keycap is the pages
bar's A/D badge, moved to a shared KeybindBadge widget.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>