Improve visual contrast of selected items

The current interface lacks sufficient visual contrast between selectable items and the currently selected item. This makes it difficult to quickly identify which item is active, especially in dark themes or when scanning quickly.

Screenshot for reference:

<img width="920" height="203" alt="Image" src="https://github.com/user-attachments/assets/be1ddbac-38d8-4145-b6b0-22c7964d990a" />

Proposed solutions:
• Add a chevron (›), arrow (→), or other marker next to the currently selected item to visually indicate focus.
• Allow customization of the theme or color contrast (e.g., through a config or theme file).
• Use background highlight or bold text for the active item.