Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/navigation/page.tsx

@@ -31,7 +31,11 @@ type PublicRow = {
 // Reusable yes/no pill so emulator boolean-ish "1"/"0" columns read consistently.
 function YesNo({ on }: { on: boolean }) {
   return (
-    <span className={`inline-block text-[0.72rem] font-bold px-2 py-0.5 rounded-full ${on ? "bg-green-600/20 text-[var(--color-text)]" : "bg-red-500/22 text-[var(--color-text)]"}`}>{on ? "Yes" : "No"}</span>
+    <span
+      className={`inline-block text-[0.72rem] font-bold px-2 py-0.5 rounded-full ${on ? "bg-green-600/20 text-[var(--color-text)]" : "bg-red-500/22 text-[var(--color-text)]"}`}
+    >
+      {on ? "Yes" : "No"}
+    </span>
   );
 }
 
@@ -117,12 +121,7 @@ export default async function AdminNavigation() {
 
       <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
         <StatusCard label={t("flatCategories")} value={flatcats.length} icon="📂" />
-        <StatusCard
-          label={t("publicFlatcats")}
-          value={publicFlatcats}
-          hint={t("markedPublic")}
-          icon="🌐"
-        />
+        <StatusCard label={t("publicFlatcats")} value={publicFlatcats} hint={t("markedPublic")} icon="🌐" />
         <StatusCard label={t("publicRooms")} value={publics.length} icon="🚪" />
         <StatusCard
           label={t("visibleRooms")}
@@ -161,7 +160,9 @@ export default async function AdminNavigation() {
                   <tr key={c.id}>
                     <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{c.id}</td>
                     <td>{c.caption || "—"}</td>
-                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{c.captionSave || "—"}</td>
+                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">
+                      {c.captionSave || "—"}
+                    </td>
                     <td>{c.minRank}</td>
                     <td>{c.maxUserCount}</td>
                     <td>
@@ -206,7 +207,7 @@ export default async function AdminNavigation() {
                       <span className="text-sm text-gray-500 dark:text-gray-400">#{p.public_cat_id}</span>
                     </td>
                     <td>
-                                            {roomNameById.get(p.room_id) || t("unnamed")}{" "}
+                      {roomNameById.get(p.room_id) || t("unnamed")}{" "}
                       <span className="text-sm text-gray-500 dark:text-gray-400">#{p.room_id}</span>
                     </td>
                     <td>