feat: artist/page endpoint, multi-disc fix, playlist ownership, UX improvements

- Switch artist view to artist/page API (proper sections: Albums, Singles & EPs,
  Live, Compilations; version in titles like "Deluxe")
- Fix artist sections categorization using releases[].type from artist/page
- Add getUser() backend call; fetch on session restore when userId=0 to fix
  playlist ownership (Remove from playlist / Delete playlist were missing)
- Fix multi-disc double-click / Play Now queue start index (disc headers were
  counted in row index but excluded from currentTracksJson)
- Hide redundant Album column when viewing an album
- Make artist name in context header clickable (navigates to artist page)
- Fix gap between title and artist name in context header (addStretch)
- Fix queue panel track titles to include version field
- Fix album list to show version in title column

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

src/list/tracks.cpp

@@ -35,24 +35,32 @@ Tracks::Tracks(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
             this, &Tracks::onDoubleClicked);
     connect(this, &QTreeView::customContextMenuRequested,
             this, &Tracks::onContextMenu);
+    connect(m_model, &QAbstractItemModel::modelReset, this, [this] {
+        for (int row : m_model->discHeaderRows())
+            setFirstColumnSpanned(row, {}, true);
+        setSortingEnabled(!m_model->hasMultipleDiscs());
+    });
 
 }
 
 void Tracks::loadTracks(const QJsonArray &tracks)
 {
     setPlaylistContext(0);
+    setColumnHidden(TrackListModel::ColAlbum, false);
     m_model->setTracks(tracks, false, /*useSequential=*/true);
 }
 
 void Tracks::loadAlbum(const QJsonObject &album)
 {
     setPlaylistContext(0);
+    setColumnHidden(TrackListModel::ColAlbum, true);
     const QJsonArray items = album["tracks"].toObject()["items"].toArray();
     m_model->setTracks(items); // album: use track_number
 }
 
 void Tracks::loadPlaylist(const QJsonObject &playlist)
 {
+    setColumnHidden(TrackListModel::ColAlbum, false);
     const qint64 id     = static_cast<qint64>(playlist["id"].toDouble());
     const qint64 ownId  = static_cast<qint64>(playlist["owner"].toObject()["id"].toDouble());
     const qint64 myId   = AppSettings::instance().userId();
@@ -65,6 +73,7 @@ void Tracks::loadPlaylist(const QJsonObject &playlist)
 void Tracks::loadSearchTracks(const QJsonArray &tracks)
 {
     setPlaylistContext(0);
+    setColumnHidden(TrackListModel::ColAlbum, false);
     m_model->setTracks(tracks, false, /*useSequential=*/true);
 }
 
@@ -118,7 +127,11 @@ void Tracks::onDoubleClicked(const QModelIndex &index)
 {
     const qint64 id = m_model->data(index, TrackListModel::TrackIdRole).toLongLong();
     if (id > 0) {
-        m_queue->setContext(m_model->currentTracksJson(), index.row());
+        // Compute filtered row (disc headers excluded from currentTracksJson)
+        int filteredRow = 0;
+        for (int r = 0; r < index.row(); ++r)
+            if (!m_model->trackAt(r).isDiscHeader) ++filteredRow;
+        m_queue->setContext(m_model->currentTracksJson(), filteredRow);
         emit playTrackRequested(id);
     }
 }
@@ -129,6 +142,7 @@ void Tracks::onContextMenu(const QPoint &pos)
     if (!index.isValid()) return;
 
     const qint64      id        = m_model->data(index, TrackListModel::TrackIdRole).toLongLong();
+    if (id <= 0) return;  // disc header row
     const QJsonObject trackJson = m_model->data(index, TrackListModel::TrackJsonRole).toJsonObject();
 
     QMenu menu(this);
@@ -153,9 +167,12 @@ void Tracks::onContextMenu(const QPoint &pos)
         });
     }
 
-    const int row = index.row();
-    connect(playNow, &QAction::triggered, this, [this, id, row] {
-        m_queue->setContext(m_model->currentTracksJson(), row);
+    // Compute filtered row for multi-disc albums (disc headers excluded from currentTracksJson)
+    int filteredRow = 0;
+    for (int r = 0; r < index.row(); ++r)
+        if (!m_model->trackAt(r).isDiscHeader) ++filteredRow;
+    connect(playNow, &QAction::triggered, this, [this, id, filteredRow] {
+        m_queue->setContext(m_model->currentTracksJson(), filteredRow);
         emit playTrackRequested(id);
     });
     connect(playNext, &QAction::triggered, this, [this, trackJson] {