V195 - V176 CHARACTER IMPORT/EXPORT PRESERVED

- Window title-bar X still opens BG2's native Exit / Stay confirmation.
- Choosing Exit now uses the same per-account deactivation core as the normal main UI EXIT before native shutdown.
- Choosing Stay does not deactivate the account.
- Each BG2 window affects only its own logged-in account flag.
- V176 character Import / Export / account-character routing are unchanged.
- No automatic character backups or restoration.
