Add see-through X-ray reveal overlay for players

Add a second, additive HDR emission color (_XRayColor) that reveals a
player through walls as a pulsing energy glow, driven during matches:

- Shader: XRayOverlay pass (ZTest Greater, additive) for occluded parts
  plus a matching additive term in the forward fragment for visible
  parts, so the glow shows everywhere and never double-blends. Exposes
  _XRayColor, _XRayPulseSpeed and _XRayPulseStrength for a breathing pulse.
- Render it after opaques via a RenderObjects feature (custom XRayReveal
  light-mode tag) on both PC and Mobile renderers, so the through-wall
  test is depth-sort independent and no longer drops out at some camera
  angles/distances.
- MeshPainter drives _XRayColor alpha through a framerate-independent
  fade (xrayFadeDuration) rather than a hard toggle.
- Reveal is driven per avatar on every client: all remaining un-found
  hiders glow during the Resolution phase, and a hider whose
  ConcealmentMeter EmbeddedPercent exceeds MatchManager.embeddedRevealPercent
  glows via an owner-authoritative NetworkVariable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Settings/Mobile_Renderer.asset

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Assets/Settings/PC_Renderer.asset

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