feat(albums): show formatted editorial descriptions

rust_backend/crates/extensions/src/backend/provider_metadata.rs

@@ -64,6 +64,11 @@ impl Backend {
                 ],
             );
             info.insert("audio_traits".into(), value["audio_traits"].clone());
+            for key in ["editorial_notes", "description"] {
+                if let Some(notes) = value.get(key) {
+                    info.insert(key.into(), notes.clone());
+                }
+            }
             info.insert(
                 "total_tracks".into(),
                 json!(value["total_tracks"].as_i64().unwrap_or_default()),
@@ -386,6 +391,11 @@ fn album(value: &Value, full: bool) -> Value {
             &["artist_id", "header_image", "header_video"],
         ));
         result.insert("audio_traits".into(), json!(array(value, "audio_traits")));
+        for key in ["editorial_notes", "description"] {
+            if let Some(notes) = value.get(key) {
+                result.insert(key.into(), notes.clone());
+            }
+        }
     }
     result.into()
 }

rust_backend/crates/extensions/src/backend/provider_metadata/value_tests.rs

@@ -12,6 +12,8 @@ function collection(id) {
     const count = Number(id);
     return {id, name: "Album 音楽 🎵", artists: "Artist Café", provider_id: "supplied",
         cover_url: "https://example.invalid/cover.jpg", total_tracks: count,
+        editorialNotes: {standard: "<p>A <i>new</i> direction &amp; sound.</p>", short: "A new direction."},
+        description: "Collection notes",
         tracks: Array.from({length: count}, (_, i) => ({id: "track-" + i,
             name: "歌 🎵 " + i, artists: "Artist Café", album_name: "Album 音楽 🎵",
             provider_id: "supplied-track", duration_ms: 123456, track_number: i + 1,
@@ -24,7 +26,10 @@ function getArtist(id) {
             url: "https://example.invalid/events/1", detailId: "event-1"}],
         headerLogo: "https://example.invalid/logo.png", albumsNext: "artist-page-2", albums: []};
 }
-function handleUrl() { return {type: "artist", artist: getArtist("artist-1")}; }
+function handleUrl(url) {
+    if (url.includes("/album/")) return {type: "album", album: collection("1"), tracks: collection("1").tracks};
+    return {type: "artist", artist: getArtist("artist-1")};
+}
 function getConcert(id) {
     return {id, artistName: "Example Artist", title: "Example Show", venue: "Example Hall",
         address: "123 Example Street", startAt: "2026-10-07T01:00:00Z",
@@ -86,6 +91,31 @@ fn concert_details_preserve_generic_actions_and_set_list() {
     assert_eq!(detail["attribution"], "Example Events");
 }
 
+#[test]
+fn album_editorial_notes_survive_metadata_and_url_routes() {
+    let (_root, backend) = fixture();
+    let direct: Value = serde_json::from_str(
+        &backend
+            .get_provider_metadata_json(ID, "album", "1", &|| Ok(()))
+            .unwrap(),
+    )
+    .unwrap();
+    let linked: Value = serde_json::from_str(
+        &backend
+            .handle_url_json("https://example.invalid/album/1")
+            .unwrap(),
+    )
+    .unwrap();
+    for album in [&direct["album_info"], &linked["album"]] {
+        assert_eq!(
+            album["editorial_notes"]["standard"],
+            "<p>A <i>new</i> direction &amp; sound.</p>"
+        );
+        assert_eq!(album["editorial_notes"]["short"], "A new direction.");
+        assert_eq!(album["description"], "Collection notes");
+    }
+}
+
 #[test]
 fn response_envelopes_preserve_json_and_cancellation() {
     let value = json!({

rust_backend/crates/extensions/src/provider.js

@@ -160,7 +160,8 @@
             ["cover_url","s","coverUrl","images"],["header_image","s","headerImage"],
             ["header_video","s","headerVideo"],["release_date","s","releaseDate"],
             ["total_tracks","i","totalTracks"],["album_type","s","albumType"],
-            ["audio_traits","a","audioTraits"],["provider_id","s","providerId"]
+            ["audio_traits","a","audioTraits"],["provider_id","s","providerId"],
+            ["editorial_notes","M","editorialNotes"],["description","s"]
         ], ["id","name","artists","total_tracks","provider_id"]);
         result.tracks = tracks;
         if (!trim(result.artists)) {