Catto's Shuffle

### Stack-Aware Deletion System

- Stackable items now lose random percentages (1-100%) instead of entire stacks
- Ammunition (arrows/bullets) can lose anywhere from 1 to 200 items per spin
- Trade goods, consumables, and other stackables have specialized deletion ranges
- Makes the addon much more unpredictable and exciting for streamers

### Bag Icon Fixes

- Fixed bag icons in main shuffle UI to show actual equipped bags
- Icons now correctly update when bags are changed
- Proper support for all bag types in Classic Era

### Technical Improvements

- Added AmmoHandler module for specialized ammunition handling
- Added StackHandler module for intelligent stack management
- Removed debug outputs and unnecessary commands
- Cleaner, more efficient codebase