fix(rendering): synchronize hidden live projections

Inbound state continues while portal reveal blocks ordinary world simulation. Synchronize only the derived render projection after those hidden-frame network and command phases so the first revealed draw cannot observe a stale live transform, without advancing effects, particles, attachments, or lights.

tests/AcDream.App.Tests/FramePhaseTestDoubles.cs

@@ -25,3 +25,9 @@ internal sealed class TestLiveSpatialReconcilePhase(Action reconcile)
 {
     public void Reconcile() => reconcile();
 }
+
+internal sealed class TestRenderProjectionSyncPhase(Action synchronize)
+    : IRenderProjectionSyncPhase
+{
+    public void SynchronizeActiveSources() => synchronize();
+}