Hand records are less likely to go missing when matches are interrupted or resumed

After leaving your seat in a friend match and returning, that hand's record could be missing and not reflected in your stats. Seats that weren't dealt into the hand are now excluded, so records are created correctly.

We also fixed a learning match getting stuck waiting after a hand couldn't proceed, so the table is now reacquired when needed. Matches are less likely to stall through reconnects and resumptions.

When the realtime connection is temporarily unstable, table assignment is now retried automatically.