Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/i18n/request.ts

@@ -22,9 +22,7 @@ export default getRequestConfig(async () => {
   // English is the source of truth; fall back to it for any key missing from a
   // translation so the UI never shows a raw key path.
   const fallback =
-    locale === DEFAULT_LOCALE
-      ? messages
-      : (await import(`../messages/${DEFAULT_LOCALE}.json`)).default;
+    locale === DEFAULT_LOCALE ? messages : (await import(`../messages/${DEFAULT_LOCALE}.json`)).default;
 
   return {
     locale,
@@ -34,8 +32,13 @@ export default getRequestConfig(async () => {
     getMessageFallback({ key }: { key: string }) {
       const fromEnglish = key
         .split(".")
-        // eslint-disable-next-line security/detect-object-injection -- o guarded as object, k is i18n key segment
-        .reduce<unknown>((o, k) => (o && typeof o === "object" ? (o as Record<string, unknown>)[k] : undefined), fallback);
+        .reduce<unknown>(
+          (o, k) =>
+            o && typeof o === "object"
+              ? (o as Record<string, unknown>)[k]
+              : undefined,
+          fallback,
+        );
       if (typeof fromEnglish === "string") return fromEnglish;
       const seg = key.split(".").pop() ?? key;
       return seg.replace(/[._-]/g, " ").replace(/\b\w/g, (c) => c.toUpperCase());