feat: rebuild the interface after Haruna

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

src/mpv/mpvitem.cpp

@@ -327,11 +327,6 @@ void MpvItem::showOnlySubtitle(int id)
     setSecondarySubtitleId(0);
 }
 
-void MpvItem::showText(const QString &text)
-{
-    commandAsync(QStringList{QStringLiteral("show-text"), text});
-}
-
 bool MpvItem::loadUserConfig() const
 {
     return m_loadUserConfig;