Ensure keyboard-accessible selected-state UX #13
Description
Ensure the sidebar selection experience is keyboard accessible and clearly communicates selected state.
Scope
- Provide focusable interactive controls for tags.
- Expose selected/pressed semantics for assistive tech.
- Ensure visible focus and selected-state styling.
Acceptance Criteria
- Tags can be selected and deselected via keyboard.
- Focus indicators are consistently visible.
- Selected state is communicated in accessible attributes and visual styling.