fix: download notification opened the wrong song (same-name album)

The finished-download notification resolved the album by name via search3, then fell back to
a same-named album by a DIFFERENT artist (or the first result) when the exact artist match
wasn't found — e.g. right after download, before Navidrome rescans. Many artists share an album
title ("I LIKE IT!"), so the notification navigated to a completely different song.

- Web (notify.js) + Android (AppNavigation): require the artist to match when known (fuzzy for
  multi-artist / album-artist drift); drop the name-only and first-result fallbacks. If nothing
  matches, show "wird evtl. gerade gescannt" instead of opening a wrong album.

The download itself was correct all along (verified: it grabbed UPSAHL's official "I LIKE IT!"
visualizer) — only the notification's navigation was wrong. SW ns-v63.

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

src/ui/notify.js

@@ -121,16 +121,21 @@ export async function _notifNavigate(notifId) {
       try {
         const r = await api('search3', `&query=${encodeURIComponent(albumQuery)}&artistCount=0&albumCount=10&songCount=0`);
         const albums = r.searchResult3?.album || [];
-        const match = albums.find(a => norm(a.name) === norm(albumQuery) && norm(a.artist) === norm(n.navArtist))
-                   || albums.find(a => norm(a.name) === norm(albumQuery))
-                   || albums[0];
+        const na = norm(n.navArtist);
+        const nameEq   = a => norm(a.name) === norm(albumQuery);
+        // Fuzzy artist compare (multi-artist / album-artist drift), but REQUIRE it when we know the
+        // artist: several artists share an album title ("I LIKE IT!"), and a name-only fallback used
+        // to open a completely different artist's album — the notification led to the wrong song.
+        const artistEq = a => { const aa = norm(a.artist); return !!na && (aa === na || aa.includes(na) || na.includes(aa)); };
+        const match = albums.find(a => nameEq(a) && artistEq(a))
+                   || (na ? null : albums.find(nameEq));   // name-only only when the artist is unknown
         if (match) {
           navigate('album-detail', { id: match.id, name: match.name, artist: match.artist || '', artistId: match.artistId || '', coverArt: match.coverArt || '' });
           return;
         }
       } catch {}
     }
-    toast('Album nicht gefunden — Library-Scan nötig?');
+    toast('Album noch nicht gefunden — evtl. wird die Library gerade gescannt');
     return;
   }
 
@@ -138,9 +143,9 @@ export async function _notifNavigate(notifId) {
     try {
       const r = await api('search3', `&query=${encodeURIComponent(n.navArtist)}&artistCount=5&albumCount=0&songCount=0`);
       const artists = r.searchResult3?.artist || [];
-      const match = artists.find(a => norm(a.name) === norm(n.navArtist)) || artists[0];
+      const match = artists.find(a => norm(a.name) === norm(n.navArtist)); // no blind artists[0]
       if (match) { navigate('artist-detail', { id: match.id, name: match.name }); return; }
     } catch {}
-    toast('Künstler nicht gefunden — Library-Scan nötig?');
+    toast('Künstler noch nicht gefunden — evtl. wird die Library gerade gescannt');
   }
 }