[Remote rendering 3.6] Save/load end-to-end verification and remove remaining reapply scaffolding #24

📝 Description of the feature

Confirm that the full RuntimeAppState round trip is correct and complete now that every state class is server-authoritative, and for any client-side state reapplication scaffolding that remains, remove it.

The intent was for each of the individual user stories in Phase 3 to have synced back the property state to the server, so that the client-side reapplication of the cached client-side state was no longer needed and removed for that property.

In this story, we:

• verify the end to end save/load state works as expected, and
• verify that no unnecessary client-side reapplication of state remains.

Acceptance Criteria

save/load state works as expected

💵 Business Value

No response

🔗 Useful links and references

No response