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/C-skyline.svg

@@ -0,0 +1,29 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
+  <rect width="64" height="64" rx="10" fill="#1a3a5c"/>
+  <!-- sky highlight -->
+  <rect x="0" y="0" width="64" height="36" fill="#2a5478"/>
+  <!-- buildings as colored vertical bars (Camogli houses are tall narrow row-houses in ochre/coral/cream) -->
+  <g>
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+    <!-- tiny dark windows for character (only readable at >=32) -->
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+    </g>
+  </g>
+  <!-- water reflection band -->
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+  <!-- yellow sun above buildings (the "V" accent reduced to a single dot) -->
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+</svg>