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>

Assets/Scenes/The Room.unity

@@ -2577,13 +2577,15 @@ MonoBehaviour:
   _directionRandomness: 0.9
   _silhouetteStretch: 3
   _baseMap: {fileID: 0}
-  _rootColor: {r: 0.34334078, g: 0.47439653, b: 0.5031446, a: 1}
-  _tipColor: {r: 0.5162572, g: 0.7079142, b: 0.7106918, a: 1}
+  _furTint: {r: 1, g: 1, b: 1, a: 1}
   _rootAO: 0.5
+  _tipShade: 0.2
   _rimPower: 5
   _rimStrength: 1
   _furMap: {fileID: 0}
   _furThreshold: 0
+  _furSoftness: 0.5
+  _strandSoftness: 0.3
   _solidRoot: 1
   _windStrength: 0.2
   _windSpeed: 1
@@ -2987,7 +2989,7 @@ GameObject:
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
-  m_IsActive: 1
+  m_IsActive: 0
 --- !u!135 &1750360001
 SphereCollider:
   m_ObjectHideFlags: 0
@@ -3721,8 +3723,8 @@ SceneRoots:
   - {fileID: 2009023824}
   - {fileID: 1515391786}
   - {fileID: 1921747288}
+  - {fileID: 1428941612}
   - {fileID: 1296216888}
   - {fileID: 1581692636}
-  - {fileID: 1428941612}
   - {fileID: 439827626}
   - {fileID: 1611975548}