site: ui/ux refresh, seo pass, find/lists indexes, 25 new finds

- newspaper-style masthead (stats | "Unique" | About/Blog) on every page
  with per-page italic subheader + last-updated date on listing pages;
  sitewide 42rem reading width
- pinterest home (hero + masonry, "load more"); old list view at /index3/
- new pages: /about, /blog, /legal, /find/, /finds/, custom 404
- footer collection links now clickable; "founded" stat replaces "updated"
  in the masthead
- centralised SEO component with per-page json-ld (Review, BlogPosting,
  Product, Article, CollectionPage, ItemList, BreadcrumbList, etc.);
  @astrojs/sitemap + @astrojs/rss; robots.txt; promoted finds canonical
  to their review
- memoize getSiteStats() so the masthead/footer counts don't multiply
  per-page build cost
- 25 new daily-finds captures

src/pages/about.astro

@@ -0,0 +1,57 @@
+---
+import BaseLayout from '../layouts/BaseLayout.astro';
+import { buildOgImage, buildBreadcrumbs, absoluteUrl } from '../lib/seo';
+
+const description =
+  'About Unique — a small, one-person blog cataloguing delightful, unusual, well-made things.';
+
+const ogImage = buildOgImage(undefined, 'site', 'About Unique');
+
+const aboutPage: Record<string, unknown> = {
+  '@context': 'https://schema.org',
+  '@type': 'AboutPage',
+  '@id': absoluteUrl('/about/#about'),
+  name: 'About — Unique',
+  description,
+  url: absoluteUrl('/about/'),
+  inLanguage: 'en-US',
+  about: {
+    '@type': 'Person',
+    name: 'rzen',
+    url: absoluteUrl('/about/'),
+  },
+};
+
+const breadcrumbs = buildBreadcrumbs([
+  { name: 'Home', url: '/' },
+  { name: 'About', url: '/about/' },
+]);
+---
+
+<BaseLayout
+  title="About"
+  description={description}
+  subheader="A small log of delightful things, kept for our own amusement."
+  ogImage={ogImage}
+  jsonLd={[aboutPage, breadcrumbs]}
+>
+  <article>
+    <p>
+      <strong>Unique</strong> is a quiet little blog that collects the small,
+      well-made things that make ordinary days a bit better — the kind of
+      object, app, or tool you find yourself recommending to a friend without
+      thinking twice.
+    </p>
+    <p>
+      It's run by one person, updated when there's something worth sharing,
+      and indexed by topic so you can browse by interest. Nothing here is
+      sponsored; some outbound links are affiliate links, which costs you
+      nothing extra and helps keep the lights on.
+    </p>
+    <p>
+      Start with the <a href="/">home page</a>, scan the
+      <a href="/grid/">grid</a>, or peek at the
+      <a href="/sources/">sources</a> we draw from.
+    </p>
+  </article>
+</BaseLayout>