fix(scene): cfg-gate test-only refresh_pending_any to silence dead-code warning

src/scene/mod.rs

@@ -2561,6 +2561,7 @@ impl Scene {
     }
 
     /// True while any force is still pending (never cleared falsely).
+    #[cfg(test)]
     pub fn refresh_pending_any(&self) -> bool {
         !self.pending_refresh.borrow().is_empty()
     }