feat: media-first bsky tiles, horizontal nav filters, dramatic log/feed panels

Homepage:
- Header is now horizontal full-width nav with type filter toggles
- Bsky tiles are media-first: video autoplay, OG thumbnails, generous sizing
- Shots never 1x1 — always at least 2-wide, more variety overall
- Posts get more size variety — ~half are bigger than 1x1
- Log tile: tactical data terminal with double frame, rivets, recessed screen
- Feed tile: comms terminal with CRT scanlines, vignette, pulsing indicator
- All tiles tagged with data-type for client-side filtering
- No likes in feed, reposts labeled