feat: album/playlist header and playlist ownership filtering

- Add TrackContextHeader widget: shows album art (fetched via NAM),
  title, subtitle (artist/description), and metadata (year · tracks · duration)
  above the track list when an album or playlist is opened
- Hide header for favorite tracks and search results
- Store user ID in AppSettings on login
- Only show "Delete playlist" for playlists the user owns
- "Add to playlist" submenu only lists owned playlists
- "Remove from this playlist" only appears when viewing an owned playlist

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

src/list/library.cpp

@@ -13,6 +13,7 @@ namespace List
 static constexpr int TypeRole    = Qt::UserRole + 1;
 static constexpr int IdRole      = Qt::UserRole + 2;
 static constexpr int NameRole    = Qt::UserRole + 3;
+static constexpr int IsOwnerRole = Qt::UserRole + 4;
 
 enum NodeType {
     NodeFavTracks,
@@ -86,22 +87,28 @@ void Library::onUserPlaylistsLoaded(const QJsonObject &result)
     while (m_playlistsNode->childCount() > 0)
         delete m_playlistsNode->takeChild(0);
 
-    QVector<QPair<qint64, QString>> playlists;
+    QVector<QPair<qint64, QString>> editablePlaylists;
+    const qint64 myUserId = AppSettings::instance().userId();
     const QJsonArray items = result["items"].toArray();
     for (const auto &v : items) {
         const QJsonObject pl    = v.toObject();
         const QString     name  = pl["name"].toString();
         const qint64      id    = static_cast<qint64>(pl["id"].toDouble());
+        const qint64      ownId = static_cast<qint64>(pl["owner"].toObject()["id"].toDouble());
+        const bool        isOwner = (myUserId > 0 && ownId == myUserId);
 
         auto *item = new QTreeWidgetItem(m_playlistsNode, QStringList{name});
         item->setData(0, TypeRole,    NodePlaylist);
         item->setData(0, IdRole,      id);
         item->setData(0, NameRole,    name);
+        item->setData(0, IsOwnerRole, isOwner);
 
-        playlists.append({id, name});
+        // Only include playlists we can edit in the "Add to playlist" submenu
+        if (isOwner)
+            editablePlaylists.append({id, name});
     }
 
-    emit userPlaylistsChanged(playlists);
+    emit userPlaylistsChanged(editablePlaylists);
 }
 
 void Library::onContextMenuRequested(const QPoint &pos)
@@ -130,7 +137,9 @@ void Library::onContextMenuRequested(const QPoint &pos)
     if (isPlaylistItem) {
         const qint64  plId      = item->data(0, IdRole).toLongLong();
         const QString plName    = item->data(0, NameRole).toString();
+        const bool    isOwner   = item->data(0, IsOwnerRole).toBool();
 
+        if (isOwner) {
             menu.addSeparator();
             auto *delPl = menu.addAction(tr("Delete \"%1\"…").arg(plName));
             connect(delPl, &QAction::triggered, this, [this, plId, plName] {
@@ -144,6 +153,7 @@ void Library::onContextMenuRequested(const QPoint &pos)
                     m_backend->deletePlaylist(plId);
             });
         }
+    }
 
     menu.exec(viewport()->mapToGlobal(pos));
 }

src/list/library.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "../backend/qobuzbackend.hpp"
+#include "../util/settings.hpp"
 
 #include <QTreeWidget>
 #include <QVector>

src/list/tracks.cpp

@@ -1,4 +1,5 @@
 #include "tracks.hpp"
+#include "../util/settings.hpp"
 
 #include <QHeaderView>
 #include <QMenu>
@@ -53,7 +54,10 @@ void Tracks::loadAlbum(const QJsonObject &album)
 void Tracks::loadPlaylist(const QJsonObject &playlist)
 {
     const qint64 id     = static_cast<qint64>(playlist["id"].toDouble());
-    setPlaylistContext(id);
+    const qint64 ownId  = static_cast<qint64>(playlist["owner"].toObject()["id"].toDouble());
+    const qint64 myId   = AppSettings::instance().userId();
+    const bool isOwned  = (myId > 0 && ownId == myId);
+    setPlaylistContext(id, isOwned);
     const QJsonArray items = playlist["tracks"].toObject()["items"].toArray();
     m_model->setTracks(items, /*usePosition=*/true);
 }
@@ -64,9 +68,10 @@ void Tracks::loadSearchTracks(const QJsonArray &tracks)
     m_model->setTracks(tracks, false, /*useSequential=*/true);
 }
 
-void Tracks::setPlaylistContext(qint64 playlistId)
+void Tracks::setPlaylistContext(qint64 playlistId, bool isOwned)
 {
     m_playlistId = playlistId;
+    m_playlistIsOwned = isOwned;
 }
 
 void Tracks::setUserPlaylists(const QVector<QPair<qint64, QString>> &playlists)
@@ -164,7 +169,7 @@ void Tracks::onContextMenu(const QPoint &pos)
         }
     }
 
-    if (m_playlistId > 0) {
+    if (m_playlistId > 0 && m_playlistIsOwned) {
         const qint64 playlistTrackId =
             m_model->data(index, TrackListModel::PlaylistTrackIdRole).toLongLong();
         if (playlistTrackId > 0) {

src/list/tracks.hpp

@@ -29,7 +29,8 @@ namespace List
         void setPlayingTrackId(qint64 id);
 
         /// Set which playlist is currently displayed (0 = none).
-        void setPlaylistContext(qint64 playlistId);
+        /// isOwned controls whether "Remove from this playlist" is shown.
+        void setPlaylistContext(qint64 playlistId, bool isOwned = false);
         qint64 playlistId() const { return m_playlistId; }
         /// Provide the user's playlist list for the "Add to playlist" submenu.
         void setUserPlaylists(const QVector<QPair<qint64, QString>> &playlists);
@@ -44,6 +45,7 @@ namespace List
         QobuzBackend   *m_backend = nullptr;
         PlayQueue      *m_queue   = nullptr;
         qint64          m_playlistId = 0;
+        bool            m_playlistIsOwned = false;
         QVector<QPair<qint64, QString>> m_userPlaylists;
 
         void onDoubleClicked(const QModelIndex &index);

src/mainwindow.cpp

@@ -242,6 +242,9 @@ void MainWindow::onLoginSuccess(const QString &token, const QJsonObject &user)
     const QString email       = user["email"].toString();
     AppSettings::instance().setDisplayName(displayName);
     AppSettings::instance().setUserEmail(email);
+    const qint64 userId = static_cast<qint64>(user["id"].toDouble());
+    if (userId > 0)
+        AppSettings::instance().setUserId(userId);
     statusBar()->showMessage(tr("Signed in as %1").arg(
         displayName.isEmpty() ? email : displayName));
     m_library->refresh();

src/util/settings.hpp

@@ -21,6 +21,9 @@ public:
     QString displayName() const      { return m_settings.value("user/display_name").toString(); }
     void setDisplayName(const QString &n) { m_settings.setValue("user/display_name", n); }
 
+    qint64 userId() const            { return m_settings.value("user/id", 0LL).toLongLong(); }
+    void setUserId(qint64 id)        { m_settings.setValue("user/id", id); }
+
     // 5 = MP3, 6 = CD, 7 = HiRes96, 27 = HiRes192
     int preferredFormat() const      { return m_settings.value("playback/format", 6).toInt(); }
     void setPreferredFormat(int f)   { m_settings.setValue("playback/format", f); }

src/view/maincontent.cpp

@@ -19,13 +19,24 @@ MainContent::MainContent(QobuzBackend *backend, PlayQueue *queue, QWidget *paren
         this);
     m_welcome->setAlignment(Qt::AlignCenter);
 
-    m_tracks     = new List::Tracks(m_backend, queue, this);
+    // Tracks page: context header + track list
+    auto *tracksPage = new QWidget(this);
+    auto *tracksLayout = new QVBoxLayout(tracksPage);
+    tracksLayout->setContentsMargins(0, 0, 0, 0);
+    tracksLayout->setSpacing(0);
+
+    m_header = new TrackContextHeader(tracksPage);
+    m_header->hide();
+    m_tracks = new List::Tracks(m_backend, queue, tracksPage);
+    tracksLayout->addWidget(m_header);
+    tracksLayout->addWidget(m_tracks, 1);
+
     m_albumList  = new AlbumListView(this);
     m_artistList = new ArtistListView(this);
     m_artistView = new ArtistView(this);
 
     m_stack->addWidget(m_welcome);    // 0
-    m_stack->addWidget(m_tracks);     // 1
+    m_stack->addWidget(tracksPage);   // 1
     m_stack->addWidget(m_albumList);  // 2
     m_stack->addWidget(m_artistList); // 3
     m_stack->addWidget(m_artistView); // 4
@@ -41,24 +52,28 @@ void MainContent::showWelcome()       { m_stack->setCurrentIndex(0); }
 
 void MainContent::showAlbum(const QJsonObject &album)
 {
+    m_header->setAlbum(album);
     m_tracks->loadAlbum(album);
     m_stack->setCurrentIndex(1);
 }
 
 void MainContent::showPlaylist(const QJsonObject &playlist)
 {
+    m_header->setPlaylist(playlist);
     m_tracks->loadPlaylist(playlist);
     m_stack->setCurrentIndex(1);
 }
 
 void MainContent::showFavTracks(const QJsonObject &result)
 {
+    m_header->hide();
     m_tracks->loadTracks(result["items"].toArray());
     m_stack->setCurrentIndex(1);
 }
 
 void MainContent::showSearchTracks(const QJsonArray &tracks)
 {
+    m_header->hide();
     m_tracks->loadSearchTracks(tracks);
     m_stack->setCurrentIndex(1);
 }

src/view/maincontent.hpp

@@ -6,6 +6,7 @@
 #include "albumlistview.hpp"
 #include "artistlistview.hpp"
 #include "artistview.hpp"
+#include "trackcontextheader.hpp"
 
 #include <QWidget>
 #include <QLabel>
@@ -40,6 +41,7 @@ private:
     QStackedWidget      *m_stack      = nullptr;
     QLabel              *m_welcome    = nullptr;
     List::Tracks        *m_tracks     = nullptr;
+    TrackContextHeader  *m_header     = nullptr;
     AlbumListView       *m_albumList  = nullptr;
     ArtistListView      *m_artistList = nullptr;
     ArtistView          *m_artistView = nullptr;

src/view/trackcontextheader.hpp

@@ -0,0 +1,162 @@
+#pragma once
+
+#include <QWidget>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QFont>
+#include <QPixmap>
+#include <QStringList>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QUrl>
+
+/// Header strip shown above the track list when an album or playlist is open.
+/// Displays album art, title, subtitle, and metadata.
+class TrackContextHeader : public QWidget
+{
+public:
+    explicit TrackContextHeader(QWidget *parent = nullptr)
+        : QWidget(parent)
+    {
+        setFixedHeight(140);
+
+        auto *hlay = new QHBoxLayout(this);
+        hlay->setContentsMargins(12, 8, 12, 8);
+        hlay->setSpacing(14);
+
+        m_art = new QLabel(this);
+        m_art->setFixedSize(120, 120);
+        m_art->setScaledContents(true);
+        m_art->setAlignment(Qt::AlignCenter);
+        m_art->setStyleSheet(QStringLiteral("background: #1a1a1a; border-radius: 4px;"));
+        hlay->addWidget(m_art, 0, Qt::AlignVCenter);
+
+        auto *info = new QWidget(this);
+        auto *vlay = new QVBoxLayout(info);
+        vlay->setContentsMargins(0, 0, 0, 0);
+        vlay->setSpacing(4);
+
+        m_title = new QLabel(info);
+        QFont tf = m_title->font();
+        tf.setPointSize(tf.pointSize() + 5);
+        tf.setBold(true);
+        m_title->setFont(tf);
+        m_title->setWordWrap(true);
+        vlay->addWidget(m_title);
+
+        m_subtitle = new QLabel(info);
+        QFont sf = m_subtitle->font();
+        sf.setPointSize(sf.pointSize() + 1);
+        m_subtitle->setFont(sf);
+        m_subtitle->setWordWrap(true);
+        vlay->addWidget(m_subtitle);
+
+        m_meta = new QLabel(info);
+        QPalette mp = m_meta->palette();
+        mp.setColor(QPalette::WindowText, QColor(0xaa, 0xaa, 0xaa));
+        m_meta->setPalette(mp);
+        vlay->addWidget(m_meta);
+
+        vlay->addStretch();
+        hlay->addWidget(info, 1);
+
+        m_nam = new QNetworkAccessManager(this);
+        QObject::connect(m_nam, &QNetworkAccessManager::finished,
+                [this](QNetworkReply *reply) {
+            reply->deleteLater();
+            if (reply->error() != QNetworkReply::NoError)
+                return;
+            QPixmap pix;
+            if (pix.loadFromData(reply->readAll()))
+                m_art->setPixmap(pix);
+        });
+    }
+
+    void setAlbum(const QJsonObject &album)
+    {
+        m_title->setText(album["title"].toString());
+        m_subtitle->setText(album["artist"].toObject()["name"].toString());
+        m_meta->setText(buildAlbumMeta(album));
+        fetchArt(album["image"].toObject());
+        show();
+    }
+
+    void setPlaylist(const QJsonObject &playlist)
+    {
+        m_title->setText(playlist["name"].toString());
+        const QString desc  = playlist["description"].toString();
+        const QString owner = playlist["owner"].toObject()["name"].toString();
+        m_subtitle->setText(desc.isEmpty() ? owner : desc);
+        m_meta->setText(buildPlaylistMeta(playlist));
+
+        const QJsonArray imgs = playlist["image_rectangle"].toArray();
+        if (!imgs.isEmpty())
+            fetchUrl(imgs.first().toString());
+        else
+            m_art->setPixmap(QPixmap());
+
+        show();
+    }
+
+private:
+    void fetchArt(const QJsonObject &img)
+    {
+        QString url = img["large"].toString();
+        if (url.isEmpty()) url = img["small"].toString();
+        fetchUrl(url);
+    }
+
+    void fetchUrl(const QString &url)
+    {
+        if (url.isEmpty()) {
+            m_art->setPixmap(QPixmap());
+            return;
+        }
+        if (url == m_currentArtUrl)
+            return;
+        m_currentArtUrl = url;
+        m_nam->get(QNetworkRequest(QUrl(url)));
+    }
+
+    static QString formatDuration(int totalSecs)
+    {
+        const int h = totalSecs / 3600;
+        const int m = (totalSecs % 3600) / 60;
+        if (h > 0)
+            return QStringLiteral("%1h %2m").arg(h).arg(m);
+        return QStringLiteral("%1 min").arg(m);
+    }
+
+    static QString buildAlbumMeta(const QJsonObject &album)
+    {
+        QStringList parts;
+        const QString year = album["release_date_original"].toString().left(4);
+        if (!year.isEmpty()) parts << year;
+        const int tracks = album["tracks_count"].toInt();
+        if (tracks > 0) parts << QStringLiteral("%1 tracks").arg(tracks);
+        const int dur = static_cast<int>(album["duration"].toDouble());
+        if (dur > 0) parts << formatDuration(dur);
+        return parts.join(QStringLiteral("  ·  "));
+    }
+
+    static QString buildPlaylistMeta(const QJsonObject &playlist)
+    {
+        QStringList parts;
+        const int tracks = playlist["tracks_count"].toInt();
+        if (tracks > 0) parts << QStringLiteral("%1 tracks").arg(tracks);
+        const int dur = static_cast<int>(playlist["duration"].toDouble());
+        if (dur > 0) parts << formatDuration(dur);
+        return parts.join(QStringLiteral("  ·  "));
+    }
+
+    QLabel                *m_art      = nullptr;
+    QLabel                *m_title    = nullptr;
+    QLabel                *m_subtitle = nullptr;
+    QLabel                *m_meta     = nullptr;
+    QNetworkAccessManager *m_nam      = nullptr;
+    QString                m_currentArtUrl;
+};