Player: tune paint brush defaults (size 25, brush index 0)

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

Assets/Prefabs/Player.prefab

@@ -502,14 +502,14 @@ MonoBehaviour:
   emissionIntensity: 20
   fur: 0
   furLength: 0.5
-  brushSize: 50
+  brushSize: 25
   brushSizeScrollFactor: 0.15
   brushMasks:
   - {fileID: 2800000, guid: d07c01c40cc7be54da0ff3ae52484cd2, type: 3}
   - {fileID: 2800000, guid: ccc205272b051834eb39593f647c7bf1, type: 3}
   - {fileID: 2800000, guid: 04bc55e2853356e4f999b995d0066b33, type: 3}
   - {fileID: 2800000, guid: 9da705c8378866146a1d4be7b2469378, type: 3}
-  activeBrushIndex: 2
+  activeBrushIndex: 0
   brushAlignment: 1
   brushRotation: 0
   paintOnMoveOnly: 1