capsite/potluck: a weekly zine of issues, not a blog

- issues collection (ISO-week slug, week, dek, rich-text body); home,
  /issues, and /issues/<week> pages; seed/issues.json holds three
  sketched issues (W38-W40) from public diigo bookmarks, editorial
  lines marked (draft); issues-sketch.md is the dry run behind them
- microformats: h-feed of h-entry lists; an issue is an h-entry
  (p-name, dt-published, p-summary, e-content); off-site links render
  as h-cite, /tag/<tag> links as rel-tag p-category (CiteLink.astro)
- diigo tags: shown on each bookmark and attached to issues via the
  tag taxonomy (now posts + issues); /tag/<tag> lists issues
- demo blog content gone: posts dropped from the seed, home page lists
  issues, site title/tagline, footer About widget, and About page
  rewritten; nav is Home / About / Issues; search and RSS cover issues
- .column container gives potluck's pages the header's margins

Generated-by: Claude Opus 5.5

potluck/src/components/CiteLink.astro

@@ -0,0 +1,43 @@
+---
+/**
+ * Portable Text link mark for issue bodies: an off-site link is a citation,
+ * marked up as an `h-cite` (name + url) so microformats parsers see each
+ * bookmark; a `/tag/<tag>` link is a rel-tag `p-category` of the issue
+ * (the `#` is CSS, so the category value is the bare tag); other on-site
+ * and anchor links stay plain.
+ *
+ * @see https://microformats.org/wiki/h-cite
+ * @see https://microformats.org/wiki/rel-tag
+ */
+export interface Props {
+	node: { markDef: { _type: "link"; _key: string; href: string; blank?: boolean } };
+}
+
+const href = Astro.props.node?.markDef?.href ?? "";
+// only these schemes become hrefs (the stored href is editor input)
+const safe = /^(https?:|mailto:|\/|#)/i.test(href) ? href : "";
+const offSite = /^https?:/i.test(safe);
+const isTag = safe.startsWith("/tag/");
+---
+
+{
+	offSite ? (
+		<cite class="h-cite"><a class="u-url p-name" href={safe}><slot /></a></cite>
+	) : isTag ? (
+		<a rel="tag" class="p-category" href={safe}><slot /></a>
+	) : (
+		<a href={safe || undefined}><slot /></a>
+	)
+}
+
+<style>
+	cite {
+		font-style: normal;
+	}
+	a[rel="tag"] {
+		font-size: 90%;
+	}
+	a[rel="tag"]::before {
+		content: "#";
+	}
+</style>