fix: artistview nullptr connect warning + album version in header

- Move updateToggleText() after m_list creation to avoid null connects
- Show version (e.g. "Deluxe") in album header title

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

src/view/artistview.cpp

@@ -30,7 +30,6 @@ ArtistSection::ArtistSection(const QString &title, QWidget *parent)
         "  border: none; border-bottom: 1px solid #333; }"
         "QToolButton:hover { background: #1e1e1e; }"
     ));
-    updateToggleText(0);
     layout->addWidget(m_toggle);
 
     m_list = new AlbumListView(this);
@@ -38,6 +37,7 @@ ArtistSection::ArtistSection(const QString &title, QWidget *parent)
 
     connect(m_toggle, &QToolButton::toggled, m_list, &AlbumListView::setVisible);
     connect(m_list, &AlbumListView::albumSelected, this, &ArtistSection::albumSelected);
+    updateToggleText(0);
 }
 
 void ArtistSection::setAlbums(const QJsonArray &albums)