- Updated all CMakeLists.txt files to use Qt6:: libraries - Added LtsFileDialog submodule (copied from qt5-before) - Added LtsReportDisplay submodule (copied from qt5-before) - Enabled both submodules in main Viewer CMakeLists.txt - Qt5::Core/Widgets → Qt6::Core/Widgets in all Viewer modules Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>