feat(library): sort control on the pressings grid

Add a Sort dropdown to /library next to the filter: Recently added
(default, importedAt desc — the prior order), Release date (album year,
newest first, unknown-year last), Album A–Z, Artist A–Z. Client-side sort
of the already-fetched albums; importedAt was already on the route, just
declared on the client type now.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/library/library-client.tsx

@@ -14,6 +14,7 @@ type Album = {
   album: string;
   format: string;
   qualityClass: number;
+  importedAt: string;
   rgMbid: string | null;
   year: string | null;
   primaryType: string | null;
@@ -21,9 +22,19 @@ type Album = {
   trackNames: string[];
 };
 
+type SortKey = "added" | "release" | "album" | "artist";
+const SORTS: { key: SortKey; label: string; cmp: (a: Album, b: Album) => number }[] = [
+  { key: "added", label: "Recently added", cmp: (a, b) => b.importedAt.localeCompare(a.importedAt) },
+  // Release date, newest first; albums with an unknown year sort to the bottom.
+  { key: "release", label: "Release date", cmp: (a, b) => (b.year ?? "0000").localeCompare(a.year ?? "0000") || a.album.localeCompare(b.album) },
+  { key: "album", label: "Album A–Z", cmp: (a, b) => a.album.localeCompare(b.album) },
+  { key: "artist", label: "Artist A–Z", cmp: (a, b) => a.artist.localeCompare(b.artist) || (a.year ?? "").localeCompare(b.year ?? "") },
+];
+
 export function LibraryClient() {
   const [albums, setAlbums] = useState<Album[]>([]);
   const [q, setQ] = useState("");
+  const [sort, setSort] = useState<SortKey>("added");
   const [open, setOpen] = useState<Album | null>(null);
   const [confirmDelete, setConfirmDelete] = useState(false);
 
@@ -56,9 +67,12 @@ export function LibraryClient() {
 
   const shown = useMemo(() => {
     const needle = q.trim().toLowerCase();
-    if (!needle) return albums;
-    return albums.filter((a) => `${a.artist} ${a.album}`.toLowerCase().includes(needle));
-  }, [albums, q]);
+    const filtered = needle
+      ? albums.filter((a) => `${a.artist} ${a.album}`.toLowerCase().includes(needle))
+      : albums;
+    const cmp = (SORTS.find((s) => s.key === sort) ?? SORTS[0]).cmp;
+    return [...filtered].sort(cmp);
+  }, [albums, q, sort]);
 
   return (
     <div>
@@ -70,6 +84,14 @@ export function LibraryClient() {
           <span>Filter</span>
           <input aria-label="filter library" placeholder="Artist or album…" value={q} onChange={(e) => setQ(e.target.value)} />
         </label>
+        <label className="field">
+          <span>Sort</span>
+          <select aria-label="sort library" value={sort} onChange={(e) => setSort(e.target.value as SortKey)}>
+            {SORTS.map((s) => (
+              <option key={s.key} value={s.key}>{s.label}</option>
+            ))}
+          </select>
+        </label>
       </form>
 
       {albums.length === 0 ? (