design: atmospheric redesign mockups (login + SPA, six dusks)

Self-contained HTML/CSS mockups proposing the brand-as-surface direction:
- Camogli harbor photo as the permanent backdrop on every authenticated view
- Six user themes rebuilt as atmospheric "dusks" (tinted overlays + accents)
  instead of cream variants
- Frosted-glass cards on top of the photo
- Same type system (Marcellus / Cormorant Garamond italic / Nunito body)
  shared between login and in-app

Includes:
- login-cinematic.html: canonical pre-auth example with Ken-Burns + grain
- spa/home.html, library.html, settings.html: in-app views with the new chrome
- spa/_tokens.css + _chrome.css: dusk system and frosted-glass primitives
- favicons/A-D: in-progress icon directions
- README.md with serving instructions and the porting checklist

Saved as a durable design artifact so the iteration survives /tmp wipes
and can be referred back to when porting to Vue.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

_design/atmospheric-redesign/favicons/D-seal.svg

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