Live updates for remote instances overview

### Description

After #7848, the device list view gets live status updates via MQTT, but the device detail page has a few spots that only reflect the initial page-load state and never update reactively.

Specifically:
- The "Last Seen" pill next to the device title doesn't update when the remote instance status changes (requires a page refresh to reflect new values)
- Agent version and Node-RED version also stay stale after the remote instance comes online, even though newer data should be available at that point
- The Finish Setup button is not hidden away to make way for the developer mode toggle and editor button

These could probably be wired up to the same team-channel state message that already drives the list view updates, or handled via a dedicated device-level subscription.

### Epic/Story

_No response_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

Start at the device detail page and trace the reactive state path already used by the device list view, including the team-channel state message or device-level subscription. Verify how Last Seen, agent version, Node-RED version, and the setup/developer-mode controls consume remote instance updates; done means each reflects status changes without a refresh and the correct controls are shown.

Written by the indexing model from the issue text.