fix: section alignment, pagination, fav state, playback error handling

**Section toggles left-aligned**
- Replace QToolButton with flat QPushButton for all section headers;
  QPushButton properly respects text-align: left in stylesheets

**Pagination via "Load More" button**
- QTreeWidget expands to fit all items so the scrollbar-based infinite
  scroll never triggered; replaced with an explicit "Load more…" button
  that appears when has_more is true and emits loadMoreRequested

**Favourite button reflects actual state**
- MainWindow preloads fav artist IDs on session restore (getFavArtists)
  and caches them in m_favArtistIds
- ArtistView receives the full set via setFavArtistIds() and checks
  it on every setArtist() call so the button starts gold if already faved
- Toggling updates the local cache immediately for back/forward nav

**Playback error → queue advances**
- player_loop now sets track_finished on Err (was only set on Ok(None)),
  so the toolbar's onTrackFinished handler advances to the next track
  instead of stalling on an unplayable track

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,6 +1,7 @@
 build/
 build-*/
 target/
+src/visualizer/
 .cache/
 *.user
 *.autosave

rust/src/player/mod.rs

@@ -215,6 +215,9 @@ fn player_loop(rx: std::sync::mpsc::Receiver<PlayerCommand>, status: PlayerStatu
             Err(e) => {
                 eprintln!("playback error: {e}");
                 *status.state.lock().unwrap() = PlayerState::Error(e.to_string());
+                // Signal track end so the queue advances to the next track
+                // instead of stalling on an unplayable track.
+                status.track_finished.store(true, Ordering::SeqCst);
             }
         }
     }

src/mainwindow.cpp

@@ -121,6 +121,7 @@ MainWindow::MainWindow(QobuzBackend *backend, QWidget *parent)
         statusBar()->showMessage(tr("Loading favorite albums…"));
     });
     connect(m_library, &List::Library::favArtistsRequested, this, [this] {
+        m_showFavArtistsOnLoad = true;
         m_backend->getFavArtists();
         statusBar()->showMessage(tr("Loading favorite artists…"));
     });
@@ -233,6 +234,8 @@ void MainWindow::tryRestoreSession()
             m_backend->getUser();  // userLoaded will call m_library->refresh()
         else
             m_library->refresh();
+        // Preload fav artists so the artist page fav button works immediately
+        m_backend->getFavArtists();
         const QString name = AppSettings::instance().displayName();
         statusBar()->showMessage(tr("Signed in as %1").arg(
             name.isEmpty() ? AppSettings::instance().userEmail() : name));
@@ -339,9 +342,22 @@ void MainWindow::onFavAlbumsLoaded(const QJsonObject &result)
 
 void MainWindow::onFavArtistsLoaded(const QJsonObject &result)
 {
+    // Always cache fav artist IDs (needed by the artist page fav button)
+    m_favArtistIds.clear();
+    const QJsonArray items = result["items"].toArray();
+    for (const QJsonValue &v : items) {
+        const qint64 id = static_cast<qint64>(v.toObject()["id"].toDouble());
+        if (id > 0) m_favArtistIds.insert(id);
+    }
+    m_content->setFavArtistIds(m_favArtistIds);
+
+    // Only navigate to the fav artists page if the user explicitly requested it
+    if (m_showFavArtistsOnLoad) {
+        m_showFavArtistsOnLoad = false;
         m_content->showFavArtists(result);
         statusBar()->showMessage(
             tr("%1 favorite artists").arg(result["total"].toInt()), 4000);
+    }
 }
 
 void MainWindow::onAlbumLoaded(const QJsonObject &album)

src/mainwindow.hpp

@@ -53,6 +53,8 @@ private:
     QobuzBackend    *m_backend     = nullptr;
     PlayQueue       *m_queue       = nullptr;
     QVector<QPair<qint64, QString>> m_userPlaylists;
+    QSet<qint64> m_favArtistIds;
+    bool m_showFavArtistsOnLoad = false;
     MainToolBar     *m_toolBar     = nullptr;
     MainContent     *m_content     = nullptr;
     List::Library   *m_library     = nullptr;

src/view/artistview.cpp

@@ -10,7 +10,6 @@
 #include <QPixmap>
 #include <QUrl>
 #include <QFont>
-#include <QScrollBar>
 #include <QRegularExpression>
 
 // Shared button style (mirrors TrackContextHeader)
@@ -18,11 +17,12 @@ static const QString kBtnBase = QStringLiteral(
     "QPushButton { padding: 5px 16px; border-radius: 4px; font-weight: bold; }"
 );
 
-// Section-toggle style: text-only, left-aligned, bottom separator
+// Section-toggle style: flat QPushButton, truly left-aligned
 static const QString kToggleStyle = QStringLiteral(
-    "QToolButton { text-align: left; font-weight: bold; padding: 4px 6px;"
+    "QPushButton { text-align: left; font-weight: bold; font-size: 13px;"
-    "  border: none; border-bottom: 1px solid #333; }"
+    "  padding: 6px 8px; border: none; border-bottom: 1px solid #333;"
-    "QToolButton:hover { background: #1e1e1e; }"
+    "  background: transparent; }"
+    "QPushButton:hover { background: #1e1e1e; }"
 );
 
 // ---------------------------------------------------------------------------
@@ -38,10 +38,10 @@ ArtistSection::ArtistSection(const QString &title, const QString &releaseType, Q
     layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
 
-    m_toggle = new QToolButton(this);
+    m_toggle = new QPushButton(this);
     m_toggle->setCheckable(true);
     m_toggle->setChecked(true);
-    m_toggle->setToolButtonStyle(Qt::ToolButtonTextOnly);
+    m_toggle->setFlat(true);
     m_toggle->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     m_toggle->setStyleSheet(kToggleStyle);
     layout->addWidget(m_toggle);
@@ -49,16 +49,26 @@ ArtistSection::ArtistSection(const QString &title, const QString &releaseType, Q
     m_list = new AlbumListView(this);
     layout->addWidget(m_list);
 
-    connect(m_toggle, &QToolButton::toggled, m_list, &AlbumListView::setVisible);
+    // "Load more" button (shown when has_more is true)
-    connect(m_list, &AlbumListView::albumSelected, this, &ArtistSection::albumSelected);
+    m_loadMoreBtn = new QPushButton(tr("Load more…"), this);
+    m_loadMoreBtn->setStyleSheet(QStringLiteral(
+        "QPushButton { text-align: left; color: #FFB232; background: transparent;"
+        "  border: none; padding: 6px 8px; }"
+        "QPushButton:hover { background: #1e1e1e; }"));
+    m_loadMoreBtn->setCursor(Qt::PointingHandCursor);
+    m_loadMoreBtn->setVisible(false);
+    layout->addWidget(m_loadMoreBtn);
 
-    // Infinite scroll: emit loadMoreRequested when scrolled to bottom
+    connect(m_toggle, &QPushButton::toggled, this, [this](bool checked) {
-    connect(m_list->verticalScrollBar(), &QScrollBar::valueChanged, this, [this](int val) {
+        m_list->setVisible(checked);
-        const int max = m_list->verticalScrollBar()->maximum();
+        m_loadMoreBtn->setVisible(checked && m_hasMore);
-        if (m_hasMore && max > 0 && val >= max) {
+        updateToggleText();
-            m_hasMore = false; // prevent double-fire until next page arrives
+    });
+    connect(m_list, &AlbumListView::albumSelected, this, &ArtistSection::albumSelected);
+    connect(m_loadMoreBtn, &QPushButton::clicked, this, [this] {
+        m_loadMoreBtn->setEnabled(false);
+        m_loadMoreBtn->setText(tr("Loading…"));
         emit loadMoreRequested(m_releaseType, m_loadedCount);
-        }
     });
 
     updateToggleText();
@@ -69,6 +79,9 @@ void ArtistSection::setAlbums(const QJsonArray &albums, bool hasMore)
     m_list->setAlbums(albums);
     m_loadedCount = albums.size();
     m_hasMore = hasMore;
+    m_loadMoreBtn->setVisible(hasMore && m_toggle->isChecked());
+    m_loadMoreBtn->setEnabled(true);
+    m_loadMoreBtn->setText(tr("Load more…"));
     updateToggleText();
 }
 
@@ -77,6 +90,9 @@ void ArtistSection::appendAlbums(const QJsonArray &albums, bool hasMore)
     m_list->addAlbums(albums);
     m_loadedCount += albums.size();
     m_hasMore = hasMore;
+    m_loadMoreBtn->setVisible(hasMore && m_toggle->isChecked());
+    m_loadMoreBtn->setEnabled(true);
+    m_loadMoreBtn->setText(tr("Load more…"));
     updateToggleText();
 }
 
@@ -92,10 +108,6 @@ void ArtistSection::updateToggleText()
         ? QStringLiteral("%1%2  (%3)").arg(arrow, m_baseTitle).arg(m_loadedCount)
         : arrow + m_baseTitle;
     m_toggle->setText(text);
-
-    disconnect(m_toggle, &QToolButton::toggled, nullptr, nullptr);
-    connect(m_toggle, &QToolButton::toggled, m_list, &AlbumListView::setVisible);
-    connect(m_toggle, &QToolButton::toggled, this, [this](bool) { updateToggleText(); });
 }
 
 // ---------------------------------------------------------------------------
@@ -194,16 +206,16 @@ ArtistView::ArtistView(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
     sectLayout->setContentsMargins(0, 0, 0, 0);
     sectLayout->setSpacing(0);
 
-    // Popular Tracks — same collapsible header style as ArtistSection
+    // Popular Tracks section — same toggle style as release sections
     m_topTracksSection = new QWidget(content);
     auto *ttLayout = new QVBoxLayout(m_topTracksSection);
     ttLayout->setContentsMargins(0, 0, 0, 0);
     ttLayout->setSpacing(0);
 
-    m_topTracksToggle = new QToolButton(m_topTracksSection);
+    m_topTracksToggle = new QPushButton(m_topTracksSection);
     m_topTracksToggle->setCheckable(true);
     m_topTracksToggle->setChecked(true);
-    m_topTracksToggle->setToolButtonStyle(Qt::ToolButtonTextOnly);
+    m_topTracksToggle->setFlat(true);
     m_topTracksToggle->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     m_topTracksToggle->setStyleSheet(kToggleStyle);
     ttLayout->addWidget(m_topTracksToggle);
@@ -212,7 +224,7 @@ ArtistView::ArtistView(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
     m_topTracks->setMaximumHeight(320);
     ttLayout->addWidget(m_topTracks);
 
-    connect(m_topTracksToggle, &QToolButton::toggled, m_topTracks, &List::Tracks::setVisible);
+    connect(m_topTracksToggle, &QPushButton::toggled, m_topTracks, &QWidget::setVisible);
     connect(m_topTracks, &List::Tracks::playTrackRequested, this, &ArtistView::playTrackRequested);
 
     sectLayout->addWidget(m_topTracksSection);
@@ -242,10 +254,13 @@ ArtistView::ArtistView(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
     connect(m_favBtn, &QPushButton::clicked, this, [this] {
         if (m_artistId <= 0) return;
         m_isFaved = !m_isFaved;
-        if (m_isFaved)
+        if (m_isFaved) {
             m_backend->addFavArtist(m_artistId);
-        else
+            m_favArtistIds.insert(m_artistId);
+        } else {
             m_backend->removeFavArtist(m_artistId);
+            m_favArtistIds.remove(m_artistId);
+        }
         setFaved(m_isFaved);
     });
 
@@ -256,7 +271,7 @@ ArtistView::ArtistView(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
     connect(m_secCompilations, &ArtistSection::albumSelected, this, &ArtistView::albumSelected);
     connect(m_secOther,        &ArtistSection::albumSelected, this, &ArtistView::albumSelected);
 
-    // Load-more connections: when a section scrolls to bottom, request next page
+    // Load-more connections
     auto connectLoadMore = [this](ArtistSection *sec) {
         connect(sec, &ArtistSection::loadMoreRequested, this,
                 [this](const QString &releaseType, int nextOffset) {
@@ -274,8 +289,7 @@ ArtistView::ArtistView(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
 void ArtistView::setArtist(const QJsonObject &artist)
 {
     m_artistId = static_cast<qint64>(artist["id"].toDouble());
-    m_isFaved  = false;
+    setFaved(m_favArtistIds.contains(m_artistId));
-    setFaved(false);
 
     m_nameLabel->setText(artist["name"].toObject()["display"].toString());
 
@@ -298,7 +312,6 @@ void ArtistView::setArtist(const QJsonObject &artist)
     }
 
     // Artist portrait: images.portrait.hash + format → CDN URL
-    // URL format: https://static.qobuz.com/images/artists/covers/large/{hash}.{format}
     const QJsonObject portrait = artist["images"].toObject()["portrait"].toObject();
     const QString hash   = portrait["hash"].toString();
     const QString format = portrait["format"].toString();
@@ -307,7 +320,6 @@ void ArtistView::setArtist(const QJsonObject &artist)
         artUrl = QStringLiteral("https://static.qobuz.com/images/artists/covers/large/%1.%2")
                      .arg(hash, format.isEmpty() ? QStringLiteral("jpg") : format);
     } else {
-        // Fallback: try direct image field
         const QJsonObject img = artist["image"].toObject();
         artUrl = img["large"].toString();
         if (artUrl.isEmpty()) artUrl = img["small"].toString();
@@ -325,9 +337,9 @@ void ArtistView::setArtist(const QJsonObject &artist)
     m_topTracks->loadTracks(topTracks);
 
     const int ttCount = topTracks.size();
-    disconnect(m_topTracksToggle, &QToolButton::toggled, nullptr, nullptr);
+    disconnect(m_topTracksToggle, &QPushButton::toggled, nullptr, nullptr);
-    connect(m_topTracksToggle, &QToolButton::toggled, m_topTracks, &List::Tracks::setVisible);
+    connect(m_topTracksToggle, &QPushButton::toggled, m_topTracks, &QWidget::setVisible);
-    connect(m_topTracksToggle, &QToolButton::toggled, this, [this, ttCount](bool open) {
+    connect(m_topTracksToggle, &QPushButton::toggled, this, [this, ttCount](bool open) {
         const QString a = open ? QStringLiteral("▼ ") : QStringLiteral("▶ ");
         m_topTracksToggle->setText(ttCount > 0
             ? QStringLiteral("%1Popular Tracks  (%2)").arg(a).arg(ttCount)
@@ -340,7 +352,7 @@ void ArtistView::setArtist(const QJsonObject &artist)
         : QStringLiteral("▼ Popular Tracks"));
     m_topTracksSection->setVisible(!topTracks.isEmpty());
 
-    // Clear release sections — populated asynchronously via setReleases
+    // Clear release sections
     for (ArtistSection *sec : {m_secAlbums, m_secEps, m_secLive, m_secCompilations, m_secOther}) {
         sec->setAlbums({});
         sec->setVisible(false);
@@ -365,6 +377,14 @@ void ArtistView::setReleases(const QString &releaseType, const QJsonArray &items
     sec->setVisible(!sec->isEmpty());
 }
 
+void ArtistView::setFavArtistIds(const QSet<qint64> &ids)
+{
+    m_favArtistIds = ids;
+    // Update current state if we're showing an artist
+    if (m_artistId > 0)
+        setFaved(ids.contains(m_artistId));
+}
+
 void ArtistView::setFaved(bool faved)
 {
     m_isFaved = faved;

src/view/artistview.hpp

@@ -8,12 +8,11 @@
 #include <QWidget>
 #include <QLabel>
 #include <QTextEdit>
-#include <QToolButton>
 #include <QPushButton>
 #include <QNetworkAccessManager>
-#include <QScrollBar>
 #include <QJsonObject>
 #include <QJsonArray>
+#include <QSet>
 
 class AlbumListView;
 
@@ -22,7 +21,6 @@ class ArtistSection : public QWidget
 {
     Q_OBJECT
 public:
-    /// releaseType is the API string ("album", "epSingle", "live", "compilation").
     explicit ArtistSection(const QString &title, const QString &releaseType, QWidget *parent = nullptr);
 
     void setAlbums(const QJsonArray &albums, bool hasMore = false);
@@ -31,23 +29,21 @@ public:
 
 signals:
     void albumSelected(const QString &albumId);
-    /// Emitted when the user scrolls to the bottom and has_more is true.
     void loadMoreRequested(const QString &releaseType, int nextOffset);
 
 private:
     QString        m_baseTitle;
     QString        m_releaseType;
-    QToolButton   *m_toggle      = nullptr;
+    QPushButton   *m_toggle       = nullptr;
     AlbumListView *m_list         = nullptr;
+    QPushButton   *m_loadMoreBtn  = nullptr;
     bool           m_hasMore      = false;
     int            m_loadedCount  = 0;
 
     void updateToggleText();
 };
 
-/// Artist detail page: portrait header (mirrors TrackContextHeader),
+/// Artist detail page.
-/// then collapsible sections for popular tracks, albums, EPs, live,
-/// compilations, and other releases.
 class ArtistView : public QWidget
 {
     Q_OBJECT
@@ -58,6 +54,7 @@ public:
     void setArtist(const QJsonObject &artist);
     void setReleases(const QString &releaseType, const QJsonArray &items,
                      bool hasMore = false, int offset = 0);
+    void setFavArtistIds(const QSet<qint64> &ids);
 
 signals:
     void albumSelected(const QString &albumId);
@@ -77,10 +74,11 @@ private:
     QNetworkAccessManager *m_nam        = nullptr;
     QString                m_currentArtUrl;
     bool                   m_isFaved    = false;
+    QSet<qint64>           m_favArtistIds;
 
     // Popular tracks section
     QWidget      *m_topTracksSection = nullptr;
-    QToolButton   *m_topTracksToggle  = nullptr;
+    QPushButton  *m_topTracksToggle  = nullptr;
     List::Tracks *m_topTracks        = nullptr;
 
     // Release sections

src/view/maincontent.cpp

@@ -112,3 +112,8 @@ void MainContent::updateArtistReleases(const QString &releaseType, const QJsonAr
 {
     m_artistView->setReleases(releaseType, items, hasMore, offset);
 }
+
+void MainContent::setFavArtistIds(const QSet<qint64> &ids)
+{
+    m_artistView->setFavArtistIds(ids);
+}

src/view/maincontent.hpp

@@ -32,6 +32,7 @@ public:
     void showFavArtists(const QJsonObject &result);
     void showArtist(const QJsonObject &artist);
     void updateArtistReleases(const QString &releaseType, const QJsonArray &items, bool hasMore, int offset);
+    void setFavArtistIds(const QSet<qint64> &ids);
 
 signals:
     void albumRequested(const QString &albumId);