release: v0.13.0 (#535)

Twenty-nine commits since v0.12.0. See CHANGELOG.md for the full list
and the upgrade notes.

Ten additions — the SEO package (site URL, robots.txt, sitemap.xml,
JSON-LD), slideshow mode, opt-in original downloads, copy-link,
previous/next album navigation, alt text from the Immich description,
per-album location precision, the update notice, a Help tab, and a
subpage cover grid separate from its photo grid. Two fixes: CJK album
slugs, and the lightbox control bar.

Photo of the Day (#476) was built on `dev` and reverted as not planned;
it never appears in a release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01DmsHVRL9yQvckUB1ZpVWre

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: ralksta <ralksta@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

app/api/admin/settings/route.ts

@@ -2,7 +2,7 @@ import { NextResponse } from 'next/server';
 import { revalidatePath } from 'next/cache';
 import { isAdminAuthenticated, isAdminEnabled } from '@/lib/admin/auth';
 import { readSettingsYaml, writeSettingsYaml } from '@/lib/admin/yaml-service';
-import { invalidateConfigCache } from '@/lib/config';
+import { invalidateConfigCache, getConfigOrNull } from '@/lib/config';
 import { immich } from '@/lib/immich';
 import type { SettingsYaml } from '@/lib/config/schema';
 
@@ -16,7 +16,16 @@ export async function GET() {
   }
 
   const settings = await readSettingsYaml();
-  return NextResponse.json({ settings: settings || {} });
+  const config = getConfigOrNull();
+  return NextResponse.json({
+    settings: settings || {},
+    // The resolved value and its origin, so the panel can say when what it
+    // shows came from SITE_URL rather than from the field itself (#472).
+    siteUrl: {
+      effective: config?.siteUrl ?? null,
+      source: config?.siteUrlSource ?? 'none',
+    },
+  });
 }
 
 /** PUT: Write settings.yaml config. */