Client and login updates

This update improves the path from the launcher to the game.

• Improved launcher sign-in and automatic entry into the world.
• Cleaner logout and startup behavior, with a roomier client size setting.
• Improved login security and protection against excessive offline character sessions.
• NPC and player visibility now adapts to each screen size, including wide screens.
• Updated client presentation with the AsuraCo splash screen and login music.