feature request: Make opponent's clock red when a player flags

[andy-ife]

This feature already exists in the old mobile app, and I think it's a great little QoL improvement. When a player loses by running out of time, simply make their clock red instead of the normal grey/black. This should probably be applied to all game clocks - tournament, otb, quick pair etc

[andy-ife]

I'll look into this @tom-anders