BoxSelection.prefab: Bring up to par with _Wen/_Prefab/Box Selection.prefab

"Blind Box.prefab" was deleted and "Blind Box - 01.prefab" created in its place so
BoxSelection.prefab's references to them were lost. Re-added them as 8 prefab instances, reset
CircularLayout.boxes, rewired HandlerDragger overrides, and rebound Box Open +
Tear Stripe PlayableDirectors (track bindings + exposed references).

 Also ported three art tweaks from Wen's latest:
  - Spot Light - Arc Box color      #FFE2A7 → #FFF1D5
  - Shared BG Sphere localScale     [.146,.152,.136] → [.161,.179,.136]
  - Main Camera backGroundColor     #D9D9D9 → #E0E0E0

BlindBox - 01.prefab:
Added two AudioSources on root and hooked them to HandlerDragger alongside GameRes/Audio/BoxAudio/Tear/Loop/End.

Adjusted HandlerDragger.cs audio logic. This gives us audio for unboxing the box.