- Gradebook now groups items by unit with collapsible cards (same card
style as course detail) and a Course overall summary table at the bottom
- server.js: add unit_id/unit_name to gradebook API so items can be grouped
- Course detail: preserve which units are open and scroll position across
any in-place re-render (add unit, delete unit, save meta, return from
item editor) — no more jumping to the top with everything reset
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nmemmertandClaude Sonnet 4.6
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