v0.6.8

Changed:
Hardened Linux CI/builds by removing unused GitHub-runner Microsoft apt sources before apt-get update.
Stabilized Windows intent overlay tests around inherited QWidget keyboard-grab methods.
Fixed:
Release artifact builds now pass the pyproject/tag version check for v0.6.8.
Linux CI and artifact builds no longer fail on unrelated packages.microsoft.com 403 metadata refresh errors.
Windows CI no longer flakes on the custom prompt keyboard-grab assertion.