Explore server-to-client messaging

### Description:

Explore whether pushing messages from the server to the client could better support communication with users. This includes understanding feasibility, constraints, and potential value.

### Acceptance Criteria:
This exploration may include:
- Investigating ways to push messages from the server to the client
- Considering how this could improve "Form closed” states, or messaging when a new server version is deployed and a user is on an outdated client version
- Identifying technical or architectural constraints and trade-offs

Start by investigating server-to-client messaging approaches for this NextJS application, focusing on feasibility and architectural constraints. Compare how they could support “Form closed” states and notifications when a new server version leaves a client outdated; document the trade-offs and potential value as the definition of done.

Written by the indexing model from the issue text.