CobbleGacha Expanded Alpha 3.7.13

Wish 3D model cleanup:
- Removed the custom 2-unit-thick slab model from 3.7.12.
- The slab was intentionally rejected because its transparent animated front/back
  faces could both be visible at an angle, producing a doubled/stacked appearance,
  and its side texture could appear as stretched colored bars.
- Replaced it with Minecraft's native generated item extrusion.
- This extrudes only the opaque pixels of the animated Wish sprite and keeps the
  animated texture itself, giving a clean thin 3D token/medallion appearance.
- Keeps the corrected 3.7.12 animation/pulse centering.
- Slightly reduced first-person scale so it does not dominate the screen.
- No gameplay logic or compiled .class files changed.
