Tune player X-ray pulse and paint padding

Author X-ray pulse shape/speed on Player.mat and raise seam padding
texels on Player.prefab.

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

Assets/Materials/Player.mat

@@ -122,7 +122,8 @@ Material:
     - _Surface: 0
     - _WorkflowMode: 1
     - _XRMotionVectorsPass: 1
-    - _XRayPulseSpeed: 10
+    - _XRayPulseShape: 5
+    - _XRayPulseSpeed: 5
     - _XRayPulseStrength: 1
     - _ZWrite: 1
     m_Colors: