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/styles/theme.css

@@ -57,6 +57,14 @@ a:where(:not([class*="emdash"]):not([class*="ec-"])):hover {
 	border-bottom-style: solid;
 }
 
+/* potluck's own pages: one column, aligned with the header's nav (same
+   width and side padding as the template's page containers). */
+.column {
+	max-width: var(--wide-width);
+	margin-inline: auto;
+	padding: var(--spacing-6) var(--spacing-6) var(--spacing-16);
+}
+
 /* Keep the signed-in Admin link separated from the primary navigation. */
 .nav-admin {
 	margin-inline-start: var(--spacing-5);