Authoring: radar scene setup, materials, tag + fur/probuilder tweaks

- Main.unity: Radar / Target Template / Point hierarchy under Radar Camera
- Radar tag added (TagManager)
- Radar.mat + RadarPoint.mat (URP Particles/Unlit blip material)
- The Room.unity: fur shader tint/softness tweaks, Target Template disabled
- Player.prefab: xrayFlashBoost/fur field reserialization
- ProBuilder editor prefs

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

ProjectSettings/TagManager.asset

@@ -17,7 +17,7 @@ TagManager:
   - Water
   - UI
   - 
-  - 
+  - Radar
   - 
   - 
   -