Add double-click-to-reset on all sliders (interval + pointer tolerance) and sync PaintHud slider defaults

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/Components/MeshPainter/MeshPainter.cs

@@ -67,7 +67,7 @@ public partial class MeshPainter : MonoBehaviour
     /// <summary>Companion to <see cref="CamoHalfLambert"/>: scales down the direct specular highlight.</summary>
     public float CamoSpecularDampen
     {
-        get => GetMatFloat(SpecularDampenId, 0f);
+        get => GetMatFloat(SpecularDampenId, 0.1f);
         set => SetMatFloat(SpecularDampenId, value);
     }