V161 - ACCOUNT MIRROR + NATIVE IMPORT/EXPORT + STOCK NAME FINISH - NO BACKUPS

1. Login connects BG2's literal characters path directly to characters_<accountname>.
2. Import and Export remain BG2's normal native screens and button actions.
3. At the Name step, NAME uses BG2's native OnMenuButtonClick() with no account gate.
4. Imported/completed characters may reopen Name.
5. CHARGEN_NAME is restored to BG2's stock edit + IsDoneButtonClickable() + OnDoneButtonClick() behavior.
6. Final ACCEPT uses BG2's native AcceptCharacter(-1) with no account gate.
7. No automatic character backups, copy restore, or deleted-character respawn are added.
