Use Patiun icons, motifs, seal logo and gold accents across the site

- Icons: Patiun stroke icon set (13 approved + 73 new) in src/lib/brand-icons.ts;
  Icon.astro and a React BrandIcon resolve mdi names to brand icons, keeping
  mdi only for third-party logos. Inline island icons (mobile menu, carousel,
  form success, board game shelf, product tile) switched too.
- Motifs: layered seal turns in the hero corner; astrolabe on the Professional
  hero; Starlight recolors of the transmutation seal and tria prima array
  behind light sections (outlined ring text, no fonts needed). Removed the
  generic sacred-geometry and astrolabe drawings.
- Gold accents: image frames and corner stars, quote bars, dividers (new
  star-line divider), nav group divider, scrolled nav rule, footer rule.
- Nav and footer use the Patiun seal; nav tagline back to "Developer. Maker.
  Storyteller."; "Web Development · a Patiun LLC company" moved to the
  footer copyright line.
- Mobile menu: Midnight drawer, visible close button.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aSbo2D1qP8cMFQCykf7kx

docs/THEMING.md

@@ -137,3 +137,20 @@ Self-hosted variable fonts via Fontsource (woff2, no external requests):
 
 Font sizes use `clamp()` for fluid scaling (see the `h1`-`h4` rules in
 `global.css`).
+
+---
+
+## Icons and motifs
+
+- **Icons:** `<Icon name="..." />` (Astro) and `<BrandIcon name="..." />` (React
+  islands) render the Patiun stroke icon set in `src/lib/brand-icons.ts`. Call
+  sites can use either the brand name (`dice`) or the mdi name (`dice-multiple`);
+  `brandIconAliases` maps one to the other. Only third-party logos (GitHub,
+  LinkedIn, Steam, ...) fall back to mdi. The gold star accent uses
+  `--icon-gold` (deep gold on Starlight, flat gold inside `.on-sky`). The file is
+  generated from the brand source (`newicons.py`); add icons there.
+- **Motifs:** `<Motif name="..." />` shows a brand motif from `public/motifs/`,
+  copied from the brand files with ring text outlined to paths. `-light` files
+  are the Starlight recolor. One focal motif per surface, kept faint.
+- **Gold accents:** image frames, quote bars, dividers and rules use
+  `--color-gold`; teal stays for links, buttons and icons.