Reorganize existing flows

[hero101]

Description

We adopted an existing implementation by the Excalidraw team as PoC. Over time, we have noticed that it can be improved and simplified. The latest changes made the state sync-able on the server, so more events and flows became obsolete or needed to be changed.
This story is about organizing current events in a more structured way, using more message types.

As a
I want
So that

Acceptance criteria

• Existing events and flows analyzed to break them down into separate messages
• Events and flows broken down using the analysis

Additional Context