feat(homepage): Australis Skyfall theme + Arbo-generated aurora background

Replaces the previous theme attempt, which was built on a misread: the ask was
to use Arbo as an IMAGE-GEN ENGINE for the background, with the operator's
Australis Skyfall design system supplying the palette.

theme/ holds the source — colors/layout/typography vendored verbatim from the
Skyfall handoff bundle, Supreme 400/500/700 woff2, the Homepage bindings in
skyfall.css.in, and build.py which inlines fonts + tokens into
conf/custom.css. custom.css is GENERATED; edit the .in file and rebuild.

The build exists because Homepage serves only custom.css and custom.js out of
its config dir, so a @font-face pointing at a vendored woff2 would 404 — the
face has to arrive as a data: URI. The background image takes the other route:
/app/public/images is a real static route, so compose.yaml now mounts
images/ there read-only and settings.yaml points at /images/.

Bindings map Skyfall's semantic layer onto Homepage's DOM: Sea surfaces, the
depth recipe (hairline AND two-layer shadow, never one alone), uppercase
eyebrow group headers, the sanctioned accent-rail on the active tab rather
than a glow, and semantic status colour so a green pill means the service is
actually serving.

Background generated by Arbo (irv-ml1:8201) workflow t2i-ui-background, job
13f0891f4e42, seed 26, flux2-klein-9b, 2048x1152 — abstract, no subject,
cool-temperature aurora. 1.6 MB PNG -> 22 KB WebP.

Two deviations are documented rather than hidden: Skyfall forbids imagery
behind body text (held at opacity 30 as mitigation), and service icons stay
full-colour vendor logos.

NOT DEPLOYED — live still runs the old theme. Prototype on :5199.
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/* ============================================================
Australis Skyfall — Color Tokens v2
A ground-up web palette derived from the Australis Dark
PHILOSOPHY (not its ANSI values). Built in OKLCH so the laws
are explicit and every family stays perceptually consistent:
- All hues are cooler than neutral; nothing warmer than amber.
- One lightness law across every chromatic family:
deep L 0.48 — light-theme fills & colored text
base L 0.66 — dark-theme fills (the working color)
bright L 0.80 — dark-theme colored text & highlights
- Chroma is tuned per hue so no family shouts over another.
- Neutrals (Sea ramp) drift in hue from ice-blue (265°) toward
ocean green (195°) as they brighten — the aurora signature.
- Medium / medium-high contrast for eye comfort.
Families: Aurora (blue, cyan, green — use generously, in that
order) and Dawn (amber, red, violet — semantic accents only:
warning, danger, AI).
============================================================ */
:root {
/* ---- Sea — neutral ramp (hue 265° → 195° as L rises) ---- */
--sea-10: oklch(0.23 0.02 265);
--sea-15: oklch(0.27 0.024 268); /* dark canvas — the Australis anchor */
--sea-20: oklch(0.31 0.022 262);
--sea-25: oklch(0.35 0.02 258);
--sea-30: oklch(0.4 0.018 252);
--sea-40: oklch(0.48 0.016 245);
--sea-50: oklch(0.56 0.015 235);
--sea-60: oklch(0.64 0.014 228);
--sea-70: oklch(0.72 0.014 220);
--sea-75: oklch(0.78 0.015 212);
--sea-80: oklch(0.83 0.017 205);
--sea-90: oklch(0.9 0.02 198);
--sea-94: oklch(0.94 0.014 195);
--sea-96: oklch(0.96 0.01 195);
--sea-98: oklch(0.98 0.006 195);
/* ---- Ice — main colors (aliases into the ramp) ---- */
--ice-black: var(--sea-15);
--ice-white: var(--sea-75);
--ice-bright-white: var(--sea-90);
/* ---- Aurora — primary families (blue > cyan > green) ---- */
--blue-deep: oklch(0.48 0.12 262);
--blue-base: oklch(0.66 0.12 262);
--blue-bright: oklch(0.8 0.09 262);
--cyan-deep: oklch(0.48 0.08 200);
--cyan-base: oklch(0.66 0.1 200);
--cyan-bright: oklch(0.8 0.1 200);
--green-deep: oklch(0.48 0.11 158);
--green-base: oklch(0.66 0.13 158);
--green-bright: oklch(0.8 0.13 158);
/* ---- Dawn — accent families (semantic use only) ---- */
--amber-deep: oklch(0.52 0.1 75);
--amber-base: oklch(0.7 0.12 78);
--amber-bright: oklch(0.82 0.13 82);
--red-deep: oklch(0.5 0.15 25);
--red-base: oklch(0.62 0.16 25);
--red-bright: oklch(0.78 0.11 28);
--violet-deep: oklch(0.5 0.15 292);
--violet-base: oklch(0.66 0.14 292);
--violet-bright: oklch(0.8 0.1 292);
}
/* ============================================================
Semantic aliases — DARK (default, first-class)
============================================================ */
:root {
color-scheme: dark;
/* Surfaces */
--surface-sunken: var(--sea-10);
--surface-base: var(--sea-15);
--surface-raised: var(--sea-20);
--surface-overlay: oklch(0.34 0.022 260);
--surface-card: var(--sea-20);
--surface-input: var(--sea-10);
--surface-scrim: oklch(0.17 0.02 265 / 0.72);
/* Text */
--text-heading: var(--sea-90);
--text-body: var(--sea-75);
--text-muted: var(--sea-60);
--text-faint: var(--sea-50);
--text-inverse: var(--sea-15);
--text-link: var(--blue-bright);
--text-link-hover: var(--sea-90);
/* Borders */
--border-subtle: var(--sea-25);
--border-default: var(--sea-30);
--border-strong: var(--sea-40);
--border-focus: var(--blue-base);
/* Accent (primary = aurora blue) */
--accent: var(--blue-base);
--accent-hover: oklch(0.71 0.11 262);
--accent-active: oklch(0.6 0.13 262);
--accent-bright: var(--blue-bright);
--accent-text: var(--blue-bright);
--accent-contrast: var(--sea-10);
--accent-soft: color-mix(in oklab, var(--blue-base) 16%, transparent);
--accent-soft-hover: color-mix(in oklab, var(--blue-base) 26%, transparent);
/* Secondary accent (aurora cyan) */
--secondary: var(--cyan-base);
--secondary-bright: var(--cyan-bright);
--secondary-text: var(--cyan-bright);
--secondary-soft: color-mix(in oklab, var(--cyan-base) 14%, transparent);
/* Semantic status */
--success: var(--green-base);
--success-text: var(--green-bright);
--success-soft: color-mix(in oklab, var(--green-base) 14%, transparent);
--warning: var(--amber-base);
--warning-text: var(--amber-bright);
--warning-soft: color-mix(in oklab, var(--amber-base) 13%, transparent);
--danger: var(--red-base);
--danger-hover: oklch(0.67 0.15 25);
--danger-text: var(--red-bright);
--danger-contrast: var(--sea-10);
--danger-soft: color-mix(in oklab, var(--red-base) 13%, transparent);
--info: var(--blue-base);
--info-text: var(--blue-bright);
--info-soft: color-mix(in oklab, var(--blue-base) 14%, transparent);
--ai: var(--violet-base);
--ai-text: var(--violet-bright);
--ai-soft: color-mix(in oklab, var(--violet-base) 13%, transparent);
/* Selection */
--selection-bg: var(--blue-base);
--selection-fg: var(--sea-10);
}
/* ============================================================
Semantic aliases — LIGHT ("Skyfall Day")
Same laws, inverted: surfaces at L 0.94–0.98, text at L 0.27–0.45,
chromatic fills & colored text drop to the deep (L 0.48) step.
============================================================ */
[data-theme="light"] {
color-scheme: light;
/* Surfaces */
--surface-sunken: var(--sea-94);
--surface-base: var(--sea-96);
--surface-raised: var(--sea-98);
--surface-overlay: #ffffff;
--surface-card: var(--sea-98);
--surface-input: #ffffff;
--surface-scrim: oklch(0.27 0.024 268 / 0.4);
/* Text */
--text-heading: var(--sea-15);
--text-body: oklch(0.38 0.02 255);
--text-muted: var(--sea-50);
--text-faint: var(--sea-60);
--text-inverse: var(--sea-90);
--text-link: var(--blue-deep);
--text-link-hover: var(--sea-15);
/* Borders */
--border-subtle: oklch(0.89 0.014 210);
--border-default: oklch(0.84 0.016 215);
--border-strong: var(--sea-75);
--border-focus: var(--blue-deep);
/* Accent */
--accent: var(--blue-deep);
--accent-hover: oklch(0.53 0.12 262);
--accent-active: oklch(0.44 0.12 262);
--accent-bright: var(--blue-base);
--accent-text: var(--blue-deep);
--accent-contrast: #ffffff;
--accent-soft: color-mix(in oklab, var(--blue-deep) 10%, transparent);
--accent-soft-hover: color-mix(in oklab, var(--blue-deep) 18%, transparent);
/* Secondary accent */
--secondary: var(--cyan-deep);
--secondary-bright: var(--cyan-base);
--secondary-text: var(--cyan-deep);
--secondary-soft: color-mix(in oklab, var(--cyan-deep) 9%, transparent);
/* Semantic status */
--success: var(--green-deep);
--success-text: var(--green-deep);
--success-soft: color-mix(in oklab, var(--green-deep) 10%, transparent);
--warning: var(--amber-deep);
--warning-text: var(--amber-deep);
--warning-soft: color-mix(in oklab, var(--amber-base) 16%, transparent);
--danger: var(--red-deep);
--danger-hover: oklch(0.55 0.16 25);
--danger-text: var(--red-deep);
--danger-contrast: #ffffff;
--danger-soft: color-mix(in oklab, var(--red-deep) 8%, transparent);
--info: var(--blue-deep);
--info-text: var(--blue-deep);
--info-soft: color-mix(in oklab, var(--blue-deep) 9%, transparent);
--ai: var(--violet-deep);
--ai-text: var(--violet-deep);
--ai-soft: color-mix(in oklab, var(--violet-deep) 9%, transparent);
/* Selection */
--selection-bg: var(--blue-base);
--selection-fg: #ffffff;
}