Sol's AuthLogin System v1.3

• Fixed spectator mode being forced back to survival after login. Switching from creative or survival to spectator now remains in spectator.
• Fixed login and logout cleanup repeatedly restoring the pre-authentication game mode after authentication had already finished.
• Modded character creation, origin selection, appearance setup, and similar GUI screens can no longer be opened or used before registration/login.
• A mandatory modded setup screen that tries to open during authentication is deferred and automatically reopened after successful registration/login.
• Inventory and container access remains protected during authentication.
• Removed forced camera-direction locking. Players can look around while authentication movement restrictions remain active.
• Fixed stale login countdowns from an older authentication attempt affecting a newer login or forced logout.
• Fixed a rare timeout race that could kick a player who had just successfully logged in.
• Fixed repeated simultaneous registration submissions racing and overwriting the newly created account password.
• Fixed loginTimeoutSeconds=0 so it now correctly disables the login timeout.
• Fixed noisy server console warnings about missing PlayerAbilities walking/flying speed methods on Forge 1.16.5.
• Reduced auth-state overhead with one-shot cleanup, once-per-tick input enforcement, event-driven GUI blocking, and direct inventory-key handling.