Merge feature/lift-lts-viewer-module-upto-qt6 into feature/regression-arcgis300-symbology-migration

- Integrated LTS viewer module with Qt6 migration
- Resolved all merge conflicts by keeping current branch versions
- Preserved existing Qt6 migration fixes

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/SymbologyXML/Gui/symbol_dialog.cpp

@@ -167,7 +167,7 @@ namespace SymbologyXML
        emit changed();
     } );
 
-    connect( m_internal->m_cbDir, &QCheckBox::stateChanged, this, [this](int)
+    connect( m_internal->m_cbDir, &QCheckBox::checkStateChanged, this, [this](int)
     {
        m_internal->m_leDir->setEnabled( m_internal->m_cbDir->isChecked() );
        emit changed();

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/SymbologyXML/symbol_reader.cpp

@@ -1050,7 +1050,7 @@ QColor SymbolReader::getAttribColor(const QColor &def) {
   QColor result = def;
   QStringView _attrib = attributes().value(QStringLiteral("color"));
   if ( _attrib.length() == 9 ) {
-    result = QColor::fromString(_attrib.left(7).toString());
+    result = QColor(_attrib.left(7).toString());
     // Get Alpha-Channel
     bool ok;
     int value = _attrib.right(2).toInt(&ok,16);