Twelve themes, and the Theme section folds away

Seven more palettes: Midnight (indigo, violet), Moss (forest floor, lime),
Plum (aubergine, purple), Sepia (warm brown with a cool teal — Ember's
arrangement reversed), Blackout (true black for a dark room, where any glow
off the screen carries), Paper (the warm light one, next to Daylight's cool
white) and Iron, which has no colour of its own: its accent is near-white, so
the only hues on screen are a module's own and the red and amber that mean
something.

Each holds the line the first five set. Text on panel lands between 14.8:1
and 19.8:1, muted between 5.8:1 and 7.4:1, and every accent clears its own
theme's danger red and warning amber by more than Ember already does — the
narrowest of the new ones is Moss at 54 degrees of hue, against Ember's 18.

The Theme section now starts folded, wearing the same disclosure triangle as
a module's config groups. A building picks its palette once and then wants
the rest of the page, which was getting further down the screen with every
swatch.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server.js

@@ -712,6 +712,13 @@ const THEMES = [
   { id: 'graphite', name: 'Graphite', colors: { bg: '#0f1012', panel: '#17191d', accent: '#6cb4ff' } },
   { id: 'ember',    name: 'Ember',    colors: { bg: '#120c0a', panel: '#1d1411', accent: '#ff8f3a' } },
   { id: 'daylight', name: 'Daylight', colors: { bg: '#eef1f5', panel: '#ffffff', accent: '#0b8a5f' } },
+  { id: 'midnight', name: 'Midnight', colors: { bg: '#0a0b18', panel: '#14162b', accent: '#9d8cff' } },
+  { id: 'moss',     name: 'Moss',     colors: { bg: '#08120c', panel: '#101e15', accent: '#8fdb3f' } },
+  { id: 'plum',     name: 'Plum',     colors: { bg: '#110a17', panel: '#1d1228', accent: '#c084fc' } },
+  { id: 'sepia',    name: 'Sepia',    colors: { bg: '#12100b', panel: '#1d1913', accent: '#5eead4' } },
+  { id: 'blackout', name: 'Blackout', colors: { bg: '#000000', panel: '#0a0a0a', accent: '#00e5ff' } },
+  { id: 'paper',    name: 'Paper',    colors: { bg: '#f5f1e8', panel: '#fffdf8', accent: '#4f46e5' } },
+  { id: 'iron',     name: 'Iron',     colors: { bg: '#0c0c0d', panel: '#161617', accent: '#d8d8dc' } },
 ];
 const DEFAULT_THEME = THEMES[0].id;