V126 - NATIVE IMPORT SAFE STAGING / NO BACKUPS

SAVE ACCOUNT CHARACTER:
- Preserves the working V125 native save -> exact CHR/BIO move to characters_<account>.
- If a previous account import is still staged, those source files are returned first at this safe boundary.

IMPORT ACCOUNT CHARACTER:
- Replaces the misleading LOAD label.
- Stages only the logged-in account CHR/BIO files into BG2's normal characters folder.
- Opens BG2's native import list so the player chooses which character to import.
- CANCEL returns staged files immediately.
- DONE does NOT move the selected CHR away immediately; doing that can crash BG2 while it finishes the import.
- Staged files are returned at the next safe boundary: before SAVE, on LOG OUT/reset, on the next import, or when the router is restarted.

No copies, backups, restore history, or respawning.
