Create: Better Stock Ticker

Stock Keeper NPC Item

• Replaced the spawn egg with a dedicated Stock Keeper NPC item — craft it directly
• New 'Sunny' slim skin as the default NPC appearance
• Slim arm support — arms adjust position automatically on slim NPC models

Hat Models Overhaul

• Hats moved to the item namespace — cleaner asset structure
• logistics_hat and train_hat rebuilt as full Blockbench models with proper geometry
• Added display transforms for third-person, first-person, fixed, and on-shelf states

NPC Config UI Polish

• Removed noAi/silent toggles from the NPC config screen
• Smoother scrolling (lower mouse-wheel sensitivity, reduced chase speed)

Misc

• Hats cache invalidates on resource reload — no more stale model issues