RyoUI - Nameplates

Nameplates

- Mouseover now correctly targets the unit you can actually see. Before, a
  casting unit could visually jump to the front of a stack but clicks would
  leak through to the unit behind it. The clickable region now follows the
  visible plate, even as it moves, scales, or changes strata.
- New mouseover priority for overlapping plates so interrupts are easier
  in crowded fights:
    1. Target
    2. Casting unit you are hovering
    3. Casting unit
    4. Non-casting unit you are hovering
    5. Non-casting unit
- New Visual Offset slider lets you lift nameplates off the unit without
  shrinking or shifting the click area.
- Selected plate growth no longer crops the click area, and the top of the
  plate no longer gets clipped when you raise the visual offset.
- Smoother vertical motion as plates scale in and out of selection, with
  no more slight bounce when the target changes.

Interrupts

- Warlock interrupt tracking fixed in Demonology: Axe Toss now correctly
  dims on cooldown. The old logic was listening for proxy spell IDs that
  never actually fire, which kept the castbar stuck in the ready state.

Cleanup

- Removed unused helpers and internal wrappers. No visible changes, just
  a lighter runtime and fewer code paths to get wrong.