V176 - TRANSPARENT ACCOUNT UI + PERMANENT DELETE (NO BACKUPS)

Based on the working V175 account isolation/import/export behavior.

UI:
- Account window reuses the current START artwork so custom blue/purple/pink interface art remains visible.
- Semi-transparent indigo panels with blue/purple/pink accent bars.
- Compact account/password/confirmation fields sized closer to their text.
- Existing Create, Login, Continue, Logout and account-mirror controls preserved.

DELETE ACCOUNT:
- Available only while logged in.
- Opens a separate irreversible-warning confirmation window.
- Requires the current account password.
- DELETE FOREVER permanently removes the characters_<account> folder and every character/metadata file inside it.
- The local Baldur.lua account verifier is disabled/cleared after the router confirms deletion.
- Account flag is deactivated and the characters mirror is disconnected.
- Account-specific character-id metadata and logs are removed.
- No backup, recycle copy, restoration copy, or automatic character respawn is created.

V175 behavior preserved:
- Account-isolated Import.
- Live active-account Export snapshot.
- Export overwrite/rename inside the active account folder.
- Account switching/log out isolation.
