Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/actions/admin-bans.ts

@@ -14,7 +14,10 @@ const PERMANENT_SECONDS = 100 * 365 * 24 * 3600;
 export async function createBan(formData: FormData): Promise<void> {
   const staff = await requireStaff();
   const userId = Number(formData.get("userId"));
-  const reason = String(formData.get("reason") ?? "").trim().slice(0, 200) || "Banned";
+  const reason =
+    String(formData.get("reason") ?? "")
+      .trim()
+      .slice(0, 200) || "Banned";
   const hours = Number(formData.get("hours"));
   const type = String(formData.get("type"));
   if (!(userId > 0) || !BAN_TYPES.has(type)) return;