- "Find Valid Tile" button in Load dialog: auto-scans manifest for the
first available ADT tile of the selected map (checks center range
25-45 first for open world, then full 0-63 for dungeons)
- Fixes "wrong coords" issue — dungeons use different tile coords than
open world maps, now auto-detected
- Map name lowercased for manifest lookup consistency
- Tile check shows green "Tile found" or red "Tile not found" indicator