♿ fix: Improve Accessibility in Endpoints Menu/Navigation

[danny-avila]

Summary

I improved the accessibility and localization of the navigation components by updating roles, focus management, and text localization.

• Localized link titles in the Nav component by applying the localize function to link.title.
• Updated text colors in the Nav component for better readability and accessibility.
• Changed the role of endpoint menu items to option and added aria-selected attributes for improved screen reader support.
• Added up/down arrow key focus management in the EndpointsMenu and ModelSpecsMenu components to enhance keyboard navigation.
• Ensured the "Set API Key" button is focusable and accessible by adding tabIndex, aria-label, and handling keyboard events.
• Prevented the mobile navigation toggle from being focusable when not in mobile view.
• Added TypeScript types to the <NavToggle /> component for better type safety and maintainability.

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

To test these changes, I:

• Navigated through the application using the keyboard to ensure that focus management works as expected.
• Used a screen reader to verify that all interactive elements have appropriate roles and labels.
• Tested the navigation components on both mobile and desktop views to confirm that the mobile nav toggle is only focusable in mobile view.
• Checked that link titles are correctly localized when switching between different languages.
• Verified that text colors meet accessibility contrast standards for better readability.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules.