Description

Currently panels render Static text — arrow keys scroll the container but don't select individual items. Upgrade content-rich panels (News, Feeds, HN, Calendar, Todos, Sports) to support item selection via up/down arrow keys when the panel is focused.

Implementation options:

• Replace Static in those panels with a ListView or OptionList widget where each item is selectable
• Or keep Static for rendering but track a _selected_idx in the panel and re-render with a highlighted row on arrow key events

The selected item should be visually highlighted (reverse or accent color). Selection state resets on data refresh (or preserves by title/id if feasible).

Depends on: TASK-005 (tab focus)

Acceptance Criteria

• #1 Up/down arrow keys move selection within a focused panel
• #2 Selected item is visually highlighted
• #3 Applicable panels: News, Feeds, HN, Calendar, Todos, Sports
• #4 Non-applicable panels (Weather, CPU, etc.) unaffected
• #5 Selection resets on page change or data refresh