BedWars beta lobby countdown stabilized

Waiting text now stays visible and a BedWars countdown starts only when at least two opposing teams are represented.

• The waiting status above the hotbar is now refreshed continuously for every queued player instead of fading between updates.
• A party placed together on one team no longer triggers a false countdown while no opposing team is present.
• If a lobby loses a required opponent during the countdown, the timer resets on the next server tick.
• BedWars is now labelled Beta in the Java and Bedrock game selectors while the strict release environment flag continues to control admission.
• Please do not hesitate to report beta bugs on Discord or Twitter/X so we can investigate them quickly.