style: Updated external connection ui

[lewislarsen]

Pull Request

Description

Fixes the style issues with the element, it didn't have a dark mode variant and it looked slightly wonky.

Type of Change

• Style change (non-breaking change which updates the styling of the UI)

How Has This Been Tested?

• Automated testing (Feature tests, Unit tests)
• Manual testing

Checklist:

• I have performed a self-review of my own code
• My changes do not introduce any new warnings or errors
• I have added tests that prove my fix is effective or that my feature works (where applicable)
• New and existing tests pass locally with my changes
• I have used translation helpers and provided translations (where applicable)
• I have run code quality tools (e.g., linters) and addressed any issues

Screenshots (if applicable):

(Before)

(After)