feat(slint): LabelReleasesView (Port 3, second of three click targets)

Wires the artist network sidebar's Labels section to a real
destination. Mirrors Tauri's LabelReleasesView.svelte core: a label
header (image + name + release count) over a wrapping album grid
with load-more pagination. (Sort / filter Hi-Res / group-by-artist
from the Tauri view are deferred — the core browse experience is in.)

Slint:
  - ContentView gains `label`; NavEntry mirrors with
    `Label { id, name }`.
  - LabelState / LabelActions globals carry the header (id, name,
    image-url + decoded image) and the AlbumCardItem grid + total.
  - New `ui/label/LabelReleasesView.slint`: label header card,
    then the same absolute-position album grid + load-more pattern
    the artist/musician views use. Reuses the Discover AlbumCard
    (artist-as-subtitle is correct here — a label's catalog is
    various artists).
  - AppShell routes ContentView.label and forwards open-album +
    media-action.

Rust:
  - `crate::label` controller — load_label (parallel-ish
    get_label_page + get_label_albums), load_more_albums,
    apply_label, append_albums, apply_image (label header), and
    artwork_jobs. extract_label_image handles the flexible
    /label/page image value (string or mega/extralarge/.../small
    object), same precedence as the Svelte.
  - artwork::ArtworkTarget gains LabelAlbum { index }.
  - main.rs: navigate_label + apply_entry route + on_label_clicked
    (sidebar) + LabelActions::on_load_more.
  - No new qbz-core methods — get_label_page / get_label_albums
    already existed.

cc

crates/qbz-slint/src/artwork.rs

@@ -54,6 +54,8 @@ pub enum ArtworkTarget {
     ArtistRelease { section_idx: usize, album_idx: usize },
     /// A card in MusicianState.appearances[index].
     MusicianAppearance { index: usize },
+    /// A card in LabelState.albums[index].
+    LabelAlbum { index: usize },
 }
 
 /// An artwork download job: which card, and the image URL.
@@ -349,5 +351,12 @@ fn apply_artwork(
                 model.set_row_data(index, item);
             }
         }
+        ArtworkTarget::LabelAlbum { index } => {
+            let model = window.global::<crate::LabelState>().get_albums();
+            if let Some(mut item) = model.row_data(index) {
+                item.artwork = image;
+                model.set_row_data(index, item);
+            }
+        }
     }
 }

crates/qbz-slint/src/label.rs

@@ -0,0 +1,222 @@
+//! LabelReleasesView controller — loads the label header (name +
+//! image from /label/page) and the paginated album catalog (from
+//! /label/getAlbums), pushing them into `LabelState`.
+//!
+//! Mirrors Tauri's LabelReleasesView.svelte data flow. The rich
+//! sort / filter / group-by-artist controls there are deferred; this
+//! port covers the header, the album grid, and load-more pagination.
+
+use std::sync::Arc;
+
+use qbz_app::shell::AppRuntime;
+use qbz_core::FrontendAdapter;
+use qbz_models::Album;
+use slint::{ComponentHandle, Model, ModelRc, VecModel};
+
+use crate::artwork::{ArtworkJob, ArtworkTarget};
+use crate::{AlbumCardItem, AppWindow, LabelState};
+
+/// Page size for the album catalog. Tauri pulls 500 at a time; keep
+/// the same so a typical label loads in one shot.
+pub const PAGE_SIZE: u32 = 500;
+
+pub struct LabelData {
+    pub id: String,
+    pub name: String,
+    pub image_url: String,
+    pub albums: Vec<AlbumCard>,
+    pub total: usize,
+}
+
+#[derive(Clone)]
+pub struct AlbumCard {
+    pub id: String,
+    pub title: String,
+    pub artist: String,
+    pub year: String,
+    pub quality_tier: String,
+    pub quality_label: String,
+    pub artwork_url: String,
+}
+
+/// Fetch the label page (name + image) and the first album page.
+pub async fn load_label<A>(
+    runtime: &Arc<AppRuntime<A>>,
+    label_id: u64,
+    fallback_name: &str,
+) -> Result<LabelData, String>
+where
+    A: FrontendAdapter + Send + Sync + 'static,
+{
+    let page = runtime
+        .core()
+        .get_label_page(label_id)
+        .await
+        .map_err(|e| e.to_string())?;
+
+    let albums_page = runtime
+        .core()
+        .get_label_albums(label_id, PAGE_SIZE, 0, None, None, None, None, None)
+        .await
+        .map_err(|e| e.to_string())?;
+
+    let name = if page.name.is_empty() {
+        fallback_name.to_string()
+    } else {
+        page.name
+    };
+    let image_url = extract_label_image(page.image.as_ref());
+    let total = albums_page.total.unwrap_or(albums_page.items.len() as u32) as usize;
+    let albums = albums_page.items.into_iter().map(map_album).collect();
+
+    Ok(LabelData {
+        id: label_id.to_string(),
+        name,
+        image_url,
+        albums,
+        total,
+    })
+}
+
+/// Fetch one more album page for the load-more affordance.
+pub async fn load_more_albums<A>(
+    runtime: &Arc<AppRuntime<A>>,
+    label_id: u64,
+    offset: u32,
+) -> Result<(Vec<AlbumCard>, usize), String>
+where
+    A: FrontendAdapter + Send + Sync + 'static,
+{
+    let page = runtime
+        .core()
+        .get_label_albums(label_id, PAGE_SIZE, offset, None, None, None, None, None)
+        .await
+        .map_err(|e| e.to_string())?;
+    let total = page.total.unwrap_or(0) as usize;
+    let albums = page.items.into_iter().map(map_album).collect();
+    Ok((albums, total))
+}
+
+fn map_album(album: Album) -> AlbumCard {
+    let year = album
+        .release_date_original
+        .as_deref()
+        .and_then(|s| s.get(..4).map(|y| y.to_string()))
+        .unwrap_or_default();
+    let quality_tier = tier(album.maximum_bit_depth).to_string();
+    let quality_label = match (album.maximum_bit_depth, album.maximum_sampling_rate) {
+        (Some(bd), Some(sr)) => format!("{}-bit / {} kHz", bd, sr),
+        _ => String::new(),
+    };
+    AlbumCard {
+        id: album.id,
+        title: album.title,
+        artist: album.artist.name,
+        year,
+        quality_tier,
+        quality_label,
+        artwork_url: album.image.best().cloned().unwrap_or_default(),
+    }
+}
+
+fn tier(bit_depth: Option<u32>) -> &'static str {
+    match bit_depth {
+        Some(b) if b > 16 => "hires",
+        Some(_) => "cd",
+        None => "",
+    }
+}
+
+/// Extract the best URL from /label/page's flexible image value. It
+/// can be a bare string or an object with mega/extralarge/large/...
+/// keys (mirrors the Svelte extraction order).
+fn extract_label_image(image: Option<&serde_json::Value>) -> String {
+    let Some(image) = image else {
+        return String::new();
+    };
+    if let Some(s) = image.as_str() {
+        return s.to_string();
+    }
+    for key in ["mega", "extralarge", "large", "thumbnail", "small"] {
+        if let Some(s) = image.get(key).and_then(|v| v.as_str()) {
+            return s.to_string();
+        }
+    }
+    String::new()
+}
+
+fn to_item(card: AlbumCard) -> AlbumCardItem {
+    AlbumCardItem {
+        id: card.id.into(),
+        title: card.title.into(),
+        artist: card.artist.into(),
+        genre: "".into(),
+        year: card.year.into(),
+        quality_tier: card.quality_tier.into(),
+        quality_label: card.quality_label.into(),
+        ribbon: "".into(),
+        ribbon_kind: "".into(),
+        artwork_url: card.artwork_url.into(),
+        artwork: slint::Image::default(),
+    }
+}
+
+pub fn apply_label(window: &AppWindow, data: LabelData) {
+    let items: Vec<AlbumCardItem> = data.albums.into_iter().map(to_item).collect();
+    let state = window.global::<LabelState>();
+    state.set_id(data.id.into());
+    state.set_name(data.name.into());
+    state.set_image_url(data.image_url.into());
+    state.set_albums(ModelRc::new(VecModel::from(items)));
+    state.set_total(data.total as i32);
+    state.set_loading(false);
+}
+
+pub fn append_albums(window: &AppWindow, albums: Vec<AlbumCard>, total: usize) {
+    let state = window.global::<LabelState>();
+    let model = state.get_albums();
+    let mut combined: Vec<AlbumCardItem> = (0..model.row_count())
+        .filter_map(|i| model.row_data(i))
+        .collect();
+    combined.extend(albums.into_iter().map(to_item));
+    state.set_albums(ModelRc::new(VecModel::from(combined)));
+    state.set_total(total as i32);
+    state.set_load_more_loading(false);
+}
+
+/// Apply the decoded label header image. Runs on the Slint event loop.
+pub fn apply_image(window: &AppWindow, pixels: &[u8], width: u32, height: u32) {
+    let mut buffer = slint::SharedPixelBuffer::<slint::Rgba8Pixel>::new(width, height);
+    let dst = buffer.make_mut_bytes();
+    if dst.len() != pixels.len() {
+        return;
+    }
+    dst.copy_from_slice(pixels);
+    window
+        .global::<LabelState>()
+        .set_image(slint::Image::from_rgba8(buffer));
+}
+
+pub fn reset_label(window: &AppWindow) {
+    let state = window.global::<LabelState>();
+    state.set_name("".into());
+    state.set_image_url("".into());
+    state.set_albums(ModelRc::new(VecModel::from(Vec::<AlbumCardItem>::new())));
+    state.set_total(0);
+    state.set_loading(true);
+    state.set_load_more_loading(false);
+}
+
+/// Artwork jobs for the label album grid — same pipeline the
+/// Discover cards use.
+pub fn artwork_jobs(data: &LabelData) -> Vec<ArtworkJob> {
+    data.albums
+        .iter()
+        .enumerate()
+        .filter(|(_, a)| !a.artwork_url.is_empty())
+        .map(|(i, a)| ArtworkJob {
+            url: a.artwork_url.clone(),
+            target: ArtworkTarget::LabelAlbum { index: i },
+        })
+        .collect()
+}

crates/qbz-slint/src/main.rs

@@ -23,6 +23,7 @@ mod commands;
 mod custom_artwork;
 mod discovery_dismiss;
 mod home;
+mod label;
 mod musician;
 mod nav;
 mod play_history;
@@ -424,9 +425,55 @@ fn apply_entry(
                 role,
             );
         }
+        nav::NavEntry::Label { id, name } => {
+            navigate_label(runtime.clone(), weak.clone(), handle, image_cache.clone(), id, name);
+        }
     }
 }
 
+/// Open a LabelReleasesView for `label_id`. Fetches the label header
+/// + first album page, then the header image.
+fn navigate_label(
+    runtime: Arc<AppRuntime<SlintAdapter>>,
+    weak: slint::Weak<AppWindow>,
+    handle: &tokio::runtime::Handle,
+    image_cache: artwork::ImageCache,
+    label_id: u64,
+    name: String,
+) {
+    handle.spawn(async move {
+        let _ = weak.upgrade_in_event_loop(|w| {
+            label::reset_label(&w);
+            w.global::<NavState>().set_view(ContentView::Label);
+        });
+        match label::load_label(&runtime, label_id, &name).await {
+            Ok(data) => {
+                let jobs = label::artwork_jobs(&data);
+                let image_url = data.image_url.clone();
+                let _ = weak.upgrade_in_event_loop(move |w| {
+                    label::apply_label(&w, data);
+                });
+                artwork::spawn_loads(jobs, weak.clone(), image_cache.clone());
+                if !image_url.is_empty() {
+                    if let Some((pixels, width, height)) =
+                        artwork::fetch_and_decode(&image_url, &image_cache, 240).await
+                    {
+                        let _ = weak.upgrade_in_event_loop(move |w| {
+                            label::apply_image(&w, &pixels, width, height);
+                        });
+                    }
+                }
+            }
+            Err(e) => {
+                log::error!("[qbz-slint] label load failed: {e}");
+                let _ = weak.upgrade_in_event_loop(|w| {
+                    w.global::<LabelState>().set_loading(false);
+                });
+            }
+        }
+    });
+}
+
 /// Open a MusicianPageView for `name + role`. Routes to the artist
 /// page instead when the resolved musician has a Confirmed Qobuz
 /// match (Tauri's `confidence === 'confirmed'` shortcut). Fetches
@@ -1278,11 +1325,37 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .on_location_clicked(|mbid| {
             log::info!("[qbz-slint] network sidebar: location clicked for mbid={mbid}");
         });
-    window
-        .global::<NetworkSidebarActions>()
-        .on_label_clicked(|id, name| {
-            log::info!("[qbz-slint] network sidebar: label clicked id={id} name={name}");
-        });
+    // Label click — open LabelReleasesView.
+    {
+        let runtime = app_runtime.clone();
+        let weak = window.as_weak();
+        let handle = tokio_rt.handle().clone();
+        let image_cache = image_cache.clone();
+        window
+            .global::<NetworkSidebarActions>()
+            .on_label_clicked(move |id, name| {
+                let Ok(label_id) = id.parse::<u64>() else {
+                    log::warn!("[qbz-slint] label clicked: invalid id {id}");
+                    return;
+                };
+                let name = name.to_string();
+                nav::record(nav::NavEntry::Label {
+                    id: label_id,
+                    name: name.clone(),
+                });
+                navigate_label(
+                    runtime.clone(),
+                    weak.clone(),
+                    &handle,
+                    image_cache.clone(),
+                    label_id,
+                    name,
+                );
+                if let Some(w) = weak.upgrade() {
+                    update_nav_flags(&w);
+                }
+            });
+    }
     // artist-clicked actually navigates — the target view (artist page)
     // already exists in Slint, unlike LabelReleases / ArtistsByLocation /
     // MusicianPage. Same flow as the top-level on_open_artist handler.
@@ -1448,6 +1521,58 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             });
     }
 
+    // Label album pagination — Load more in LabelReleasesView
+    // appends the next page onto the grid.
+    {
+        let runtime = app_runtime.clone();
+        let weak = window.as_weak();
+        let handle = tokio_rt.handle().clone();
+        let image_cache = image_cache.clone();
+        window
+            .global::<LabelActions>()
+            .on_load_more(move || {
+                let Some(w) = weak.upgrade() else {
+                    return;
+                };
+                let state = w.global::<LabelState>();
+                let Ok(label_id) = state.get_id().to_string().parse::<u64>() else {
+                    return;
+                };
+                let offset = state.get_albums().row_count() as u32;
+                state.set_load_more_loading(true);
+                let runtime = runtime.clone();
+                let weak = weak.clone();
+                let image_cache = image_cache.clone();
+                handle.spawn(async move {
+                    match label::load_more_albums(&runtime, label_id, offset).await {
+                        Ok((data, total)) => {
+                            let jobs: Vec<artwork::ArtworkJob> = data
+                                .iter()
+                                .enumerate()
+                                .filter(|(_, a)| !a.artwork_url.is_empty())
+                                .map(|(i, a)| artwork::ArtworkJob {
+                                    url: a.artwork_url.clone(),
+                                    target: artwork::ArtworkTarget::LabelAlbum {
+                                        index: offset as usize + i,
+                                    },
+                                })
+                                .collect();
+                            let _ = weak.upgrade_in_event_loop(move |w| {
+                                label::append_albums(&w, data, total);
+                            });
+                            artwork::spawn_loads(jobs, weak, image_cache);
+                        }
+                        Err(e) => {
+                            log::error!("[qbz-slint] label load-more failed: {e}");
+                            let _ = weak.upgrade_in_event_loop(|w| {
+                                w.global::<LabelState>().set_load_more_loading(false);
+                            });
+                        }
+                    }
+                });
+            });
+    }
+
     // Artwork right-click menu wiring — Open in browser / Save as /
     // Add custom / Remove custom. Mirrors the v2_library_* + native
     // dialog flow Tauri uses on artist portraits + album covers.

crates/qbz-slint/src/nav.rs

@@ -26,6 +26,12 @@ pub enum NavEntry {
         name: String,
         role: String,
     },
+    /// LabelReleasesView — opened by the artist network sidebar's
+    /// Labels section. Carries the label id + name fallback.
+    Label {
+        id: u64,
+        name: String,
+    },
 }
 
 struct History {

crates/qbz-slint/ui/app.slint

@@ -17,7 +17,7 @@ import { LoginScreen } from "login/LoginScreen.slint";
 import { AppShell } from "shell/AppShell.slint";
 
 // Re-export the state globals so the Rust layer can populate them.
-export { HomeState, AlbumState, ArtistState, NavState, SessionState, SettingsState, AlbumActions, ArtistActions, ArtworkActions, NowPlayingState, QueueState, SearchState, SearchActions, NetworkSidebarState, NetworkSidebarActions, MusicianState, MusicianActions } from "state.slint";
+export { HomeState, AlbumState, ArtistState, NavState, SessionState, SettingsState, AlbumActions, ArtistActions, ArtworkActions, NowPlayingState, QueueState, SearchState, SearchActions, NetworkSidebarState, NetworkSidebarActions, MusicianState, MusicianActions, LabelState, LabelActions } from "state.slint";
 
 // Which top-level screen is shown. The app starts on `splash` while it
 // restores a saved session, then resolves to `shell` or `login`.

crates/qbz-slint/ui/label/LabelReleasesView.slint

@@ -0,0 +1,154 @@
+// LabelReleasesView — opened from the artist network sidebar's
+// Labels section. Mirrors Tauri's LabelReleasesView.svelte core:
+// a label header (image + name + album count) over a wrapping
+// album grid with load-more pagination. The sort / filter /
+// group-by-artist controls from the Tauri view are deferred.
+
+import { Theme } from "../foundation/semantic-colors.slint";
+import { Typography } from "../foundation/typography.slint";
+import { Radius } from "../foundation/radius.slint";
+import { LabelState, LabelActions, AlbumCardItem } from "../state.slint";
+import { AlbumCard } from "../discover/AlbumCard.slint";
+import { QbzIcon } from "../primitives/QbzIcon.slint";
+import { LoadingSpinner } from "../primitives/LoadingSpinner.slint";
+import { NavButtons } from "../shell/NavButtons.slint";
+
+export component LabelReleasesView inherits Rectangle {
+    callback open-album(string);
+    callback media-action(string, string, string);
+
+    property <length> card-width: 220px;
+    property <length> card-height: 266px;
+    property <length> card-gap: 24px;
+
+    background: Theme.surface-main;
+
+    Flickable {
+        viewport-width: self.width;
+        viewport-height: page.preferred-height;
+
+        page := VerticalLayout {
+            width: parent.width;
+            padding-left: 32px;
+            padding-right: 32px;
+            padding-top: 11px;
+            padding-bottom: 100px;
+            spacing: 0px;
+            alignment: start;
+
+            HorizontalLayout {
+                alignment: start;
+                NavButtons { }
+            }
+
+            Rectangle { height: 22px; }
+
+            // --- Label header ------------------------------------------
+            HorizontalLayout {
+                spacing: 24px;
+                alignment: start;
+                Rectangle {
+                    width: 120px;
+                    height: 120px;
+                    border-radius: Radius.md;
+                    background: Theme.surface-elevated;
+                    clip: true;
+                    Image {
+                        width: 100%;
+                        height: 100%;
+                        source: LabelState.image;
+                        image-fit: cover;
+                    }
+                    if LabelState.image-url == "": QbzIcon {
+                        source: @image-url("../assets/icons/disc-3.svg");
+                        width: 44px;
+                        height: 44px;
+                        x: (parent.width - self.width) / 2;
+                        y: (parent.height - self.height) / 2;
+                        tint: Theme.text-muted;
+                    }
+                }
+                VerticalLayout {
+                    alignment: center;
+                    spacing: 6px;
+                    Text {
+                        text: @tr("LABEL");
+                        color: Theme.text-muted;
+                        font-size: 10px;
+                        font-weight: Typography.semibold;
+                        letter-spacing: 1.5px;
+                    }
+                    Text {
+                        text: LabelState.name;
+                        color: Theme.text-primary;
+                        font-size: Typography.title;
+                        font-weight: Typography.bold;
+                    }
+                    if LabelState.total > 0: Text {
+                        text: LabelState.total + " " + @tr("releases");
+                        color: Theme.text-muted;
+                        font-size: Typography.body;
+                    }
+                }
+            }
+
+            Rectangle { height: 32px; }
+
+            if LabelState.loading && LabelState.albums.length == 0: HorizontalLayout {
+                alignment: center;
+                LoadingSpinner { size: 36px; }
+            }
+
+            // --- Album grid --------------------------------------------
+            if LabelState.albums.length > 0: grid := Rectangle {
+                property <int> columns: Math.max(
+                    1,
+                    Math.floor((self.width + root.card-gap) / (root.card-width + root.card-gap)));
+                property <int> rows: Math.ceil(LabelState.albums.length / self.columns);
+                height: self.rows > 0
+                    ? self.rows * root.card-height + Math.max(0, self.rows - 1) * root.card-gap
+                    : 0px;
+                for album[i] in LabelState.albums: AlbumCard {
+                    x: Math.mod(i, grid.columns) * (root.card-width + root.card-gap);
+                    y: Math.floor(i / grid.columns) * (root.card-height + root.card-gap);
+                    width: root.card-width;
+                    height: root.card-height;
+                    album: album;
+                    clicked(id) => {
+                        root.open-album(id);
+                    }
+                    media-action(kind, id, action) => {
+                        root.media-action(kind, id, action);
+                    }
+                }
+            }
+
+            if LabelState.albums.length > 0
+                && LabelState.albums.length < LabelState.total: HorizontalLayout {
+                alignment: center;
+                Rectangle {
+                    width: load-more-text.preferred-width + 24px;
+                    height: 32px;
+                    load-more-text := Text {
+                        text: LabelState.load-more-loading
+                            ? @tr("Loading…")
+                            : @tr("Load more");
+                        color: load-more-ta.has-hover
+                            ? Theme.text-primary
+                            : Theme.text-secondary;
+                        font-size: 13px;
+                        x: (parent.width - self.width) / 2;
+                        y: (parent.height - self.height) / 2;
+                    }
+                    load-more-ta := TouchArea {
+                        mouse-cursor: pointer;
+                        enabled: !LabelState.load-more-loading;
+                        clicked => {
+                            LabelActions.load-more();
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

crates/qbz-slint/ui/shell/AppShell.slint

@@ -17,6 +17,7 @@ import { HomeView } from "../discover/HomeView.slint";
 import { AlbumPageView } from "../album/AlbumPageView.slint";
 import { ArtistPageView } from "../artist/ArtistPageView.slint";
 import { MusicianPageView } from "../musician/MusicianPageView.slint";
+import { LabelReleasesView } from "../label/LabelReleasesView.slint";
 import { SettingsView } from "../settings/SettingsView.slint";
 import { SearchResultsView } from "../search/SearchResultsView.slint";
 
@@ -100,6 +101,14 @@ export component AppShell inherits Rectangle {
                         root.open-album(id);
                     }
                 }
+                if NavState.view == ContentView.label: LabelReleasesView {
+                    open-album(id) => {
+                        root.open-album(id);
+                    }
+                    media-action(kind, id, action) => {
+                        root.media-action(kind, id, action);
+                    }
+                }
                 if NavState.view == ContentView.settings: SettingsView {
                     settings-bool(k, v) => {
                         root.settings-bool(k, v);

crates/qbz-slint/ui/state.slint

@@ -94,7 +94,7 @@ export global AlbumActions {
 }
 
 // Which content view the shell shows.
-export enum ContentView { home, album, artist, settings, search, musician }
+export enum ContentView { home, album, artist, settings, search, musician, label }
 
 // Settings screen state. Audio and Playback preferences are loaded from
 // the persistence stores by the Rust settings controller and pushed here;
@@ -433,6 +433,24 @@ export global MusicianActions {
     callback load-more();
 }
 
+// LabelReleasesView state — opened by the artist network sidebar's
+// Labels section. Header (name + image) from /label/page, the
+// album grid from /label/getAlbums. Populated by `crate::label`.
+export global LabelState {
+    in property <string> id;
+    in property <string> name;
+    in property <string> image-url;
+    in property <image> image;
+    in property <[AlbumCardItem]> albums: [];
+    in property <int> total: 0;
+    in property <bool> loading: false;
+    in property <bool> load-more-loading: false;
+}
+
+export global LabelActions {
+    callback load-more();
+}
+
 // Shell chrome state — collapsible left sidebar and right-side panels.
 // Globals are imported directly by the shell components, so toggles
 // need no callback plumbing.