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-slint/ui/discover/ForYouView.slint

@@ -9,12 +9,14 @@
 // (More from library, Rediscover) are later increments.
 
 import { Theme } from "../foundation/semantic-colors.slint";
-import { ForYouState } from "../state.slint";
+import { Typography } from "../foundation/typography.slint";
+import { ForYouState, RadioStationItem } from "../state.slint";
 import { Carousel } from "Carousel.slint";
 import { SlimCarousel } from "SlimCarousel.slint";
 import { ArtistCarousel } from "ArtistCarousel.slint";
 import { Spotlight } from "Spotlight.slint";
 import { QobuzMixesRow } from "QobuzMixesRow.slint";
+import { RadioCard } from "RadioCard.slint";
 import { LoadingSpinner } from "../primitives/LoadingSpinner.slint";
 
 export component ForYouView inherits VerticalLayout {
@@ -24,6 +26,7 @@ export component ForYouView inherits VerticalLayout {
     callback play-track(string);
     callback play-top-tracks(string);
     callback start-radio(string);
+    callback start-radio-album(string);
     callback open-mix(string);
 
     spacing: 40px;
@@ -54,6 +57,43 @@ export component ForYouView inherits VerticalLayout {
         }
     }
 
+    // 1b. Radio Stations — album-seeded radio tiles.
+    if ForYouState.radio-stations.length > 0: VerticalLayout {
+        spacing: 12px;
+        Text {
+            text: @tr("Radio Stations");
+            color: Theme.text-primary;
+            font-size: 18px;
+            font-weight: Typography.semibold;
+        }
+        Rectangle {
+            height: 234px;
+            clip: true;
+            radio-flick := Flickable {
+                width: 100%;
+                height: parent.height;
+                viewport-width: ForYouState.radio-stations.length * (180px + 32px);
+                viewport-height: self.height;
+                HorizontalLayout {
+                    spacing: 32px;
+                    alignment: start;
+                    for st in ForYouState.radio-stations: RadioCard {
+                        seed-title: st.title;
+                        seed-subtitle: st.artist;
+                        label: "RADIO";
+                        artwork: st.artwork;
+                        clicked => {
+                            root.start-radio-album(st.album-id);
+                        }
+                        play => {
+                            root.start-radio-album(st.album-id);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     // 2. Recently Played Tracks.
     if ForYouState.recent-tracks.length > 0: SlimCarousel {
         title: @tr("Recently Played Tracks");
@@ -86,7 +126,29 @@ export component ForYouView inherits VerticalLayout {
         }
     }
 
-    // 5. Artists to Follow.
+    // 5. More From Your Library.
+    if ForYouState.more-from-library.albums.length > 0: Carousel {
+        section: ForYouState.more-from-library;
+        album-clicked(id) => {
+            root.open-album(id);
+        }
+        media-action(kind, id, action) => {
+            root.media-action(kind, id, action);
+        }
+    }
+
+    // 6. Rediscover Your Library.
+    if ForYouState.rediscover.albums.length > 0: Carousel {
+        section: ForYouState.rediscover;
+        album-clicked(id) => {
+            root.open-album(id);
+        }
+        media-action(kind, id, action) => {
+            root.media-action(kind, id, action);
+        }
+    }
+
+    // 6. Artists to Follow.
     if ForYouState.artists-to-follow.length > 0: ArtistCarousel {
         title: @tr("Artists to Follow");
         artists: ForYouState.artists-to-follow;

crates/qbz-slint/ui/discover/HomeView.slint

@@ -283,6 +283,9 @@ export component HomeView inherits Rectangle {
                     start-radio(id) => {
                         root.media-action("artist", id, "radio");
                     }
+                    start-radio-album(id) => {
+                        root.media-action("album", id, "radio");
+                    }
                     open-mix(which) => {
                         root.media-action("mix", which, "open");
                     }