fix: subdomain capture

src/components/page-head-meta.ts

@@ -9,11 +9,12 @@
  * Rules:
  *  - `title` → `props.title + site.titleSuffix`
  *  - `canonical` → explicit `props.canonical` override wins; otherwise
- *    `https://${site.domain}${pathname}`. The pathname is the *browser* path
- *    (from `useLocation`), which is correct because vercel.json host rewrites
- *    target internal route prefixes (`/nessa`, `/lineage`, …) while leaving
- *    the public URL intact — so `nessa.freno.me/contact` reports pathname
- *    `/contact`, and the canonical is `https://nessa.freno.me/contact`.
+ *    `https://${site.domain}${pathname}` where `pathname` is the *public*
+ *    browser path. Because the subdomain prefix (`/lineage`, `/nessa`, …) is
+ *    an internal-only rewrite (applied by `vercel.json` host rewrites or, in
+ *    their absence, by `src/middleware.ts`), `useLocation()` reports the
+ *    prefixed path (`/lineage/privacy`) and we strip the prefix back off so
+ *    the canonical reflects the public URL (`https://lineage.freno.me/privacy`).
  *  - `ogImage` → explicit `props.ogImage` wins; otherwise `site.ogDefaultImage`.
  *  - `ogTitle` / `ogDescription` → explicit override wins; otherwise fall
  *    back to the base title (no suffix) / description (existing behavior).
@@ -54,7 +55,22 @@ export function resolvePageHeadMeta(
   pathname: string
 ): ResolvedPageHeadMeta {
   const title = `${props.title}${site.titleSuffix}`;
-  const canonical = props.canonical ?? `https://${site.domain}${pathname}`;
+  /**
+   * The canonical URL is the *public* browser URL, never the internal route
+   * prefix. SolidStart's file router is host-blind, so subdomain routes live
+   * under `src/routes/<prefix>/*` and are served either by `vercel.json` host
+   * rewrites OR by `src/middleware.ts` (the in-app host rewrite). Both append
+   * the prefix to the internal request path (`/privacy` → `/lineage/privacy`),
+   * so `useLocation()` reports the prefixed path — which we strip back off so
+   * the canonical stays `https://lineage.freno.me/privacy`.
+   */
+  const publicPath =
+    site.baseRoutePrefix &&
+    (pathname === site.baseRoutePrefix ||
+      pathname.startsWith(site.baseRoutePrefix + "/"))
+      ? pathname.slice(site.baseRoutePrefix.length) || "/"
+      : pathname;
+  const canonical = props.canonical ?? `https://${site.domain}${publicPath}`;
   const ogTitle = props.ogTitle ?? props.title;
   const ogDescription = props.ogDescription ?? props.description;
   const ogImage = props.ogImage ?? site.ogDefaultImage;