Refactor Windows build cleanup to use a dedicated $libDir and more aggressively prune unused PySide6/Qt files. Replaces direct $distDir references with $libDir for lib content and removes screenshots, PDBs, translations, many plugin folders, specific image/icon plugins (qpdf/qsvg/qsvgicon), platform input contexts, and common bulky Qt DLL patterns. Also removes several build tools/unused Python modules (setuptools, wheel, pkg_resources, _distutils_hack, curses, _pyrepl). Applied the same changes to both YTSage and YTSage-FFmpeg packaging steps to reduce bundle size and noise, and improved log messages for removed items.
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