Log controls and a calmer screen

Added

• Server logs respect a level setting, so debug chatter stays quiet unless asked for, and can mirror to a file.
• Connection and request logs include the client IP.

Changed

• Logging in or starting a guest session keeps you on the main screen instead of sending you to the lobby list.
• The Stats tile opens the login prompt for guests, Decks and Skins stay marked Soon, and leaving a lobby returns you to the list right away.

Fixed

• A login or logout no longer opens a second WebSocket that duplicates chat messages.
• Guests and bots no longer collect player stats.