Build an Accordion
Build an accordion from the provided SECTIONS data. The starter renders every section expanded — make each one toggle on its own.
Requirements
- Clicking a section's title expands or collapses that section.
- Sections toggle independently: any number can be open at once.
- All sections start collapsed.
- Keep
aria-expandedon each title button in sync (the chevron flips off it).
Hints
Hint 1
Track open sections as a Set of ids in one state value; a section is open when the set has its id.
Hint 2
State must be replaced, not mutated: copy with new Set(open), then add or delete, then set the copy.
Hint 3
Collapse by not rendering the body (open.has(id) && <p>…</p>) — the aria-expanded attribute belongs on the button either way.