Accessibility improvements on the UI

# Summary

The UI is lacks accessibility considerations for a lot of UI controls.
- no proper focus states
- keyboard navigation does not work as expected
- color contrast issues

# Use Cases
- This is required for day to day working

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**Message from the maintainers**:

Love this enhancement proposal? Give it a 👍. We prioritise the proposals with the most 👍.

Start by inventorying the UI controls affected by the proposal and reviewing their current focus states, keyboard navigation, and color contrast. Done means the affected controls support expected keyboard use, have proper focus states, and meet the project's accessibility expectations, but the issue does not identify specific files, tests, or an entry point.

Written by the indexing model from the issue text.