Add polished mobile-first styles:
- Create Omni/Jr/Web/Style.hs with Clay CSS
- Base on Omni/Look.hs patterns (fuckingStyle as base)
- Status badges: colored pills (Open=yellow, InProgress=blue, Review=purple, Approved=cyan, Done=green)
- Large touch targets (min 44px height for buttons/links)
- Single column layout on narrow screens (<600px)
- Card-style sections with subtle shadows
- Responsive navigation header
- Serve CSS at GET /style.css