refactor: unify context menus across all views

- Add icons to all context menus (search panel, genre browser, queue panel)
  matching the track list's established pattern
- Standardize navigation wording: "Open album: X" / "Open artist: X"
  consistently (was "Go to" in search panel, bare "Open Album" in genre browser)
- Genre browser album menu: add "Add to favorites" and "Open artist: X"
  (was missing both)
- Genre browser playlist menu: add icon, lowercase "playlist" for consistency
- Queue panel menu: add list-remove and go-up icons
- Track list: add icon to "Remove from this playlist" action
- Search panel album menu: add icons for all actions

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

src/list/tracks.cpp

@@ -347,7 +347,7 @@ void Tracks::onContextMenu(const QPoint &pos)
             m_model->data(index, TrackListModel::PlaylistTrackIdRole).toLongLong();
         if (playlistTrackId > 0) {
             if (m_userPlaylists.isEmpty()) menu.addSeparator();
-            auto *remFromPl = menu.addAction(tr("Remove from this playlist"));
+            auto *remFromPl = menu.addAction(QIcon(":/res/icons/list-remove.svg"), tr("Remove from this playlist"));
             const qint64 curPlaylistId = m_playlistId;
             const int    curRow        = index.row();
             connect(remFromPl, &QAction::triggered, this, [this, curPlaylistId, playlistTrackId, curRow] {