- Replace emoji icons with Lucide across admin pages; add vendor/lucide.min.js and renderIcons() helper\n- Reorder sidebar logically (Dashboard, Journal, Students, Groups, Files, Links, Trash + admin sections)\n- Groups: open photo chronology only via the Фото button; covers no longer clickable\n- Journal: show group badge over card photo, compact AI-status icon beside description, and date range in empty-state message\n- Update README (AI worker, Lucide, worker.js)
- New /api/system-info endpoint returning DB size, table sizes, photo/file counts, uploads stats, disk usage
- System info cards in settings page (responsive grid)
- Replaced inline onclick handlers with data attributes + event delegation in groups.html
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