feat: add playlist, recent files and MPRIS backends

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/mpris/mprisitem.h

@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: 2026 George Florea Bănuș <georgefb899@gmail.com>
+// SPDX-FileCopyrightText: 2026 Tri Vo Khac
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "mpvitem.h"
+#include "playlistmodel.h"
+
+#include <QObject>
+#include <QPointer>
+#include <QWindow>
+#include <QtQml/qqmlregistration.h>
+
+#include <memory>
+
+class MprisController;
+
+// Publishes the player on D-Bus (MPRIS), so Plasma's media controls, the lock screen
+// and media keys can drive it. Adapted from Haruna's MprisItem.
+class MprisItem : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(MpvItem *mpvItem READ mpvItem WRITE setMpvItem NOTIFY mpvItemChanged REQUIRED)
+    Q_PROPERTY(PlaylistModel *playlist READ playlist WRITE setPlaylist NOTIFY playlistChanged REQUIRED)
+    Q_PROPERTY(QWindow *window READ window WRITE setWindow NOTIFY windowChanged REQUIRED)
+
+public:
+    explicit MprisItem(QObject *parent = nullptr);
+    ~MprisItem() override;
+
+    MpvItem *mpvItem() const;
+    void setMpvItem(MpvItem *mpv);
+    PlaylistModel *playlist() const;
+    void setPlaylist(PlaylistModel *playlist);
+    QWindow *window() const;
+    void setWindow(QWindow *window);
+
+Q_SIGNALS:
+    void mpvItemChanged();
+    void playlistChanged();
+    void windowChanged();
+    void raiseRequested();
+    void openUriRequested(const QString &uri);
+    // Play the next/previous entry, the way the playlist actions would.
+    void nextRequested();
+    void previousRequested();
+
+private:
+    void updatePlaybackStatus();
+    void updateNavigation();
+
+    std::unique_ptr<MprisController> m_controller;
+    QPointer<MpvItem> m_mpv;
+    QPointer<PlaylistModel> m_playlist;
+    QPointer<QWindow> m_window;
+};