Continues the a11y pass from the previous commit — adds objectName,
Accessible.role, Accessible.name to all remaining qml/MetaBuilder/,
qml/qt6/, and qml/widgets/ files. Widget files also get activeFocusOnTab
on interactive elements and dynamic Accessible.name bindings.
Cleans up redundant addImportPath(projectRoot) call in main.cpp.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>