[Remote rendering 4.3] RemoteCanvas frame display and interaction forwarding #28

📝 Description of the feature

This is the first real remote frontend work. Everything before this was backend or the mode probe.

Create a RemoteCanvas to subscribe to the frame stream from 4.1, and draws frames to a canvas, forwarding mouse and wheel events back to the server, built from scratch against the wslink protocol since trame-rca ships only a Vue component.

RemoteRenderer.ts implements IRenderer over trigger calls to the server.

Acceptance Criteria

A fresh frame appears on connect and reconnect (no blank canvas).
Tests pass

💵 Business Value

No response

🔗 Useful links and references

No response