Toggle session panel with Escape as in-game pause overlay

- Panel shows in Main while disconnected, auto-hides once a connection is
  established, and toggles open/closed with Escape in the Lobby or on a Map.
- Escape now pauses gameplay (active mode exits, cursor freed, paint and
  movement disabled) instead of ending the match directly; closing restores
  the prior mode via SwitchTo.
- Disconnect button is context-aware: leaves the session in the Lobby, acts
  as "Back to Lobby" (EndMatch) for the match authority on a Map, and stays a
  plain disconnect for non-authority clients on a Map.
- Removed the Escape->EndMatch handler from MatchManager; match end now routes
  through RequestEndMatch with the same authority routing.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scenes/Main.unity

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