- lts_date_time_edit_p.cpp: Replace QWheelEvent::delta() with angleDelta().y()
- lts_notification_box.cpp: Remove QStyleOption::init() call (removed in Qt6)
- lts_text_editor2.cpp: Remove QTextCodec include, use QString::fromUtf8 instead
All changes are Qt6 API compatibility fixes required for building with Qt 6.10.2.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>