SL-4: leftover owned-cyan tint + Gameplay prop reposition

Uncommitted residue from the SL-4 visual-cohesion pass, swept up while
cleaning the worktree (unrelated to the 6.5 upgrade):
- Mat_StructureOwned_Cyan: _Color nudged to match _BaseColor (0.11,0.22,0.26)
- Gameplay.unity: a prop transform moved (0,1,8) -> (5.1,2.46,20.7)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Subscenes/Gameplay.unity

@@ -2285,7 +2285,7 @@ Transform:
   m_GameObject: {fileID: 1192434514}
   serializedVersion: 2
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0, y: 1, z: 8}
+  m_LocalPosition: {x: 5.1, y: 2.46, z: 20.7}
   m_LocalScale: {x: 1.5, y: 2.5, z: 1.5}
   m_ConstrainProportionsScale: 0
   m_Children: []