FarlandsTweaks Core 1.3 - AllTheLeaks / JEI compatibility patch 1

- Adapts AllTheLeaks 1.1.3 ElementSearchMixin to JEI 15.59's
  add(IListElementInfo, IIngredientManager) signature.
- Preserves AllTheLeaks' original behavior: invisible JEI elements are skipped.
- Applies only when the exact legacy handler descriptor and bytecode body are present.
- Client-side transformation only in practice because ElementSearchMixin is listed
  by AllTheLeaks as a client mixin. Dedicated-server behavior is unchanged.
