Part of #339
Most complex interaction migration:
css/pages/timeline.css + js/pages/timeline.js- Forum-style timeline rows (time, type dot, text, salience)
- Sticky date headers with count
- Tag filtering preserved: hover dims non-matching, click pins selection
- Infinite scroll pagination preserved
- Range/type/project/search filters preserved
- Sparkline from charts.js
Part of #339
Most complex interaction migration:
css/pages/timeline.css+js/pages/timeline.js