feat: For You — radio, album suggestions, rediscover, more-from-library

Completes the remaining For You sections by porting two Qobuz API
endpoints down into qbz-core and adding the local "forgotten
favorites" approximation.

Backend ports (qbz-models + qbz-qobuz + qbz-core):
  - /album/suggest -> AlbumSuggestResponse, QobuzClient::get_album_suggest,
    QbzCore::get_album_suggest.
  - /radio/artist + /radio/album -> RadioResponse, get_radio_artist /
    get_radio_album on the client + core. (Faithful ports of the legacy
    src-tauri/api/client.rs methods — same paths, params, shapes.)

For You sections:
  - Radio Stations — album-seeded radio tiles (recent + favorite
    albums, deduped, capped 12), rendered with RadioCard; click starts
    a real Qobuz album radio.
  - More From Your Library — /album/suggest seeded from the most recent
    played album (else first favorite).
  - Rediscover Your Library — favorite albums not in the local
    play-history (approximation of Tauri's reco-DB forgotten
    favorites).
  - Spotlight's RADIO card + the artist "radio" action now create a
    real Qobuz artist radio (playback::play_artist_radio /
    play_album_radio build a queue from the radio track list and play).

Section order now matches Tauri: Qobuz Mixes, Release Watch, Radio
Stations, Recently Played Tracks/Albums, Your Top Artists, More From
Your Library, Rediscover, Artists to Follow, Spotlight.

Still backend-blocked: the Qobuz mix detail views (DailyQ/WeeklyQ/etc.)
and the smart radio_engine (the Qobuz radio used here is the simpler
/radio/* endpoint, not the local pool builder).

cc

crates/qbz-models/src/lib.rs

@@ -43,8 +43,10 @@ pub use playback::{PlaybackState, PlaybackStatus, QueueState, QueueTrack, Repeat
 pub use traits::{FrontendAdapter, LoggingAdapter, NoOpAdapter};
 pub use types::{
     Album,
+    AlbumSuggestResponse,
     AlbumSummary,
     Artist,
+    RadioResponse,
     ArtistAlbums,
     ArtistBiography,
     // Discover types

crates/qbz-models/src/types.rs

@@ -665,6 +665,26 @@ pub struct SearchResultsPage<T> {
     pub limit: u32,
 }
 
+/// Response from `/album/suggest` — albums similar to a seed album.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AlbumSuggestResponse {
+    #[serde(default)]
+    pub algorithm: Option<String>,
+    #[serde(default)]
+    pub albums: Option<SearchResultsPage<Album>>,
+}
+
+/// Response from the `/radio/*` endpoints — a generated track list.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RadioResponse {
+    #[serde(rename = "type", default)]
+    pub radio_type: Option<String>,
+    #[serde(default)]
+    pub title: Option<String>,
+    #[serde(default)]
+    pub tracks: Option<SearchResultsPage<Track>>,
+}
+
 /// One entry of the Qobuz `most_popular` block in a combined search.
 /// Serde tagging matches the legacy `V2MostPopularItem` so the Tauri
 /// command's response shape is unchanged.