Fix: restore redirect to the user's preferred locale

Users were no longer sent to their preferred locale. `LocaleRedirector` was emptied in `115fa5aca` after its previous versions caused repeated redirects, and nothing replaced it.

**Cause**
- The earlier logic compared the best locale (a string) against the current locale entry (an object), so the check was always true on non-default locale pages
- That made the redirect fire repeatedly, which led to the logic being removed entirely

**Changes**
- Derive the current locale from the URL, treating the default locale as unprefixed to match how pages are generated
- Redirect only when the best locale differs from the current locale, so it stops after one hop
- Redirect users with a saved `preferred-locale` from any page
- Redirect users without a saved preference from default-locale URLs only, using their browser language, so shared locale links are respected
- Preserve the rest of the path when swapping the locale prefix
- Skip `/api` paths

packages/website/src/components/LocaleRedirector.astro

@@ -1,3 +1,30 @@
 <script>
+  import locales from "@blitzkit/i18n/locales.json";
+  import { getBestLocale } from "../core/i18n/getBestLocale";
 
+  const pathname = window.location.pathname;
+  const isAPI = pathname.startsWith("/api");
+  const hasPreference = localStorage.getItem("preferred-locale") !== null;
+  const bestLocale = getBestLocale();
+  const currentLocale =
+    locales.supported.find(
+      ({ locale }) =>
+        locale !== locales.default &&
+        (pathname === `/${locale}` || pathname.startsWith(`/${locale}/`)),
+    )?.locale ?? locales.default;
+
+  if (
+    !isAPI &&
+    bestLocale !== currentLocale &&
+    (hasPreference || currentLocale === locales.default)
+  ) {
+    const rawPath =
+      currentLocale === locales.default
+        ? pathname
+        : pathname.slice(`/${currentLocale}`.length) || "/";
+
+    window.location.pathname = `${
+      bestLocale === locales.default ? "" : `/${bestLocale}`
+    }${rawPath}`;
+  }
 </script>