feat: options dialog cleanup, menu/tree styling, light theme contrast

- Remove dead "Safe Mode" option, rename title case to "Uppercase menu items"
- Options tree: icons, themed hover/selection, mouse tracking (matches workspace tree)
- Tree item row padding (+4px) via MenuBarStyle CT_ItemViewItem for all trees
- Titlebar grows 2px when icon shown
- Menu popups: custom separator drawing, opaque background fill, flat hover highlight
- Menu bar/popup hover uses accent color (QPalette::Highlight) instead of grey
- Light theme: bump textMuted/textFaint contrast
- Dock grip widget for workspace and scanner docks

src/titlebar.cpp

@@ -107,12 +107,14 @@ void TitleBarWidget::setShowIcon(bool show) {
     if (show) {
         m_appLabel->setText(QString());
         m_appLabel->setPixmap(QIcon(":/icons/class.png").pixmap(24, 24));
+        setFixedHeight(34);
     } else {
         m_appLabel->setPixmap(QPixmap());
         m_appLabel->setText(QStringLiteral("Reclass"));
         m_appLabel->setStyleSheet(
             QStringLiteral("QLabel { color: %1; font-size: 12px; font-weight: bold; }")
                 .arg(m_theme.text.name()));
+        setFixedHeight(32);
     }
 }