feat(admin): multi-select bulk delete in media library

Per-file checkboxes + "حذف موارد انتخاب‌شده (N)" bar that deletes all selected
files in parallel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/admin/FileManager.tsx

@@ -15,8 +15,17 @@ export function FileManager() {
   const [copied, setCopied] = useState<string | null>(null);
   const [search, setSearch] = useState("");
   const [type, setType] = useState("");
+  const [selected, setSelected] = useState<Set<string>>(new Set());
   const inputRef = useRef<HTMLInputElement>(null);
 
+  const toggleSel = (id: string) =>
+    setSelected((s) => {
+      const n = new Set(s);
+      if (n.has(id)) n.delete(id);
+      else n.add(id);
+      return n;
+    });
+
   const reload = useCallback(async () => {
     setLoading(true);
     try {
@@ -59,6 +68,14 @@ export function FileManager() {
     setTimeout(() => setCopied(null), 1500);
   };
 
+  const bulkDelete = async () => {
+    if (selected.size === 0) return;
+    if (!confirm(`حذف ${selected.size.toLocaleString("fa-IR")} فایل انتخاب‌شده؟`)) return;
+    await Promise.all(Array.from(selected).map((id) => fetch(`/api/admin/resource/files/${id}`, { method: "DELETE" })));
+    setSelected(new Set());
+    reload();
+  };
+
   return (
     <div className="space-y-4" dir="rtl">
       <div className="flex flex-wrap items-center justify-between gap-3">
@@ -81,6 +98,11 @@ export function FileManager() {
             </button>
           ))}
         </div>
+        {selected.size > 0 && (
+          <button onClick={bulkDelete} className="rounded-lg border border-red-500/40 bg-red-500/10 px-3 py-1.5 text-xs text-red-300 hover:bg-red-500/20">
+            حذف موارد انتخاب‌شده ({selected.size.toLocaleString("fa-IR")})
+          </button>
+        )}
         <input
           className="ms-auto w-56 rounded-lg border border-[#262b40] bg-[#0c0e1a] px-3 py-2 text-sm text-gray-100 outline-none focus:border-indigo-500"
           placeholder="جستجوی نام فایل…" value={search} onChange={(e) => setSearch(e.target.value)}
@@ -103,7 +125,13 @@ export function FileManager() {
             {files.map((f) => {
               const url = fileUrl(f);
               return (
-                <div key={f.id} className="group rounded-lg border border-[#262b40] bg-[#0c0e1a] p-2">
+                <div key={f.id} className={`group relative rounded-lg border bg-[#0c0e1a] p-2 ${selected.has(f.id) ? "border-indigo-500" : "border-[#262b40]"}`}>
+                  <input
+                    type="checkbox"
+                    checked={selected.has(f.id)}
+                    onChange={() => toggleSel(f.id)}
+                    className="absolute end-3 top-3 z-10 h-4 w-4 cursor-pointer accent-indigo-500"
+                  />
                   <div className="flex aspect-square items-center justify-center overflow-hidden rounded-md bg-[#070811]">
                     {url && isImage(f) ? (
                       // eslint-disable-next-line @next/next/no-img-element