One-Click Update for Device Agent

### Epic

_No response_

### Description

As a FlowFuse user who frequently utilizes devices,

I want the FlowFuse UI to provide a clear notification and an immediate option for updating the Device Agent whenever a new version is released,

So that I can remain informed about the availability of new updates and conveniently update my Device Agent with just a single click, ensuring my experience is always optimized with the latest features and security enhancements.

See also UX for Stacks

### Which customers would this be availble to

All Users, (CE)

### Acceptance Criteria

_No response_

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

I have provided an initial effort estimate
```[tasklist]
### First Iteration
- [ ] https://github.com/FlowFuse/flowfuse/issues/3006
```