Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/api/radio/now-playing/route.ts

@@ -44,9 +44,7 @@ export async function GET(_req: Request) {
   } catch (e) {
     const aborted = e instanceof Error && e.name === "AbortError";
     return apiJson({
-      error: aborted
-        ? `Timed out after ${FETCH_TIMEOUT_MS / 1000}s`
-        : "Fetch failed",
+      error: aborted ? `Timed out after ${FETCH_TIMEOUT_MS / 1000}s` : "Fetch failed",
     });
   } finally {
     clearTimeout(timer);