Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/redeem/RedeemForm.tsx

@@ -13,10 +13,7 @@ export default function RedeemForm() {
   const [state, formAction, pending] = useActionState(redeem, initialState);
 
   return (
-    <form
-      action={formAction}
-      style={{ display: "flex", flexDirection: "column", gap: "0.75rem" }}
-    >
+    <form action={formAction} style={{ display: "flex", flexDirection: "column", gap: "0.75rem" }}>
       <input
         name="code"
         maxLength={255}

src/app/redeem/page.tsx

@@ -29,11 +29,7 @@ export default async function RedeemPage() {
 
   return (
     <main style={{ display: "grid", gap: "1.5rem" }}>
-      <ContentCard
-        icon="🎟️"
-        title={t("title")}
-        subtitle={t("subtitle")}
-      />
+      <ContentCard icon="🎟️" title={t("title")} subtitle={t("subtitle")} />
 
       <div className="card-grid sm-2">
         <ContentCard icon="🔑" title={t("enterCode")}>