New Features:
- Load monsters and NPCs from configurable Lua folders; shows warnings/errors for empty or problematic files and prompts to set folders when missing. Missing-creature dialogs and progress labels updated (“Loading monsters ...”, “Loading NPCs ...”, “Missing Monsters”, “Missing NPCs”).
- Preferences page adds directory pickers for Monsters/NPCs Lua folders; values are saved and applied.
- Brush list and palettes display creature sprites for loaded monsters/NPCs.
Chores:
- Added lightweight Lua parsing helpers to support importing outfits and surface warnings for malformed files.
