'Enable Protected Mode' button is very wide

### Current Behavior

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Environment

- FlowFuse version:
- Node.js version:
- npm version:
- Platform/OS:
- Browser:

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

I have provided an initial effort estimate

Start by reproducing the screen shown in the attached screenshot and locate the UI component that renders the “Enable Protected Mode” button. Inspect its layout and styling to determine why the button is unusually wide; done means the button has an appropriate width without disrupting the surrounding interface.

Written by the indexing model from the issue text.