Player session never recovers after server restart

[karyao]

Description

When backend restarts, frontend keeps the player's IDs cookie forever which causes app reconnects indefinitely, so users are stuck on a "Connection lost. Retrying in -s..." until they manually delete cookie.

Steps to reproduce

1. Register as player and join game
2. Restart pacmacro server
3. Reload page
4. Stuck in game, but never able to connect.

Tasks

• to be added

[karyao]

Let's implement this when we implement the log-out feature for player.