- Replace nuget approach (doesn't contain tkinter) with extracting
from the official Python amd64.exe installer using 7z
- Remove MUI_ICON/MUI_UNICON (no .ico file available, use NSIS default)
- Add p7zip-full to CI dependencies
- installer.nsi: per-user install to AppData, Start Menu shortcuts,
optional desktop shortcut and autostart, clean uninstall (preserves
data/), Add/Remove Programs registration
- build-dist-windows.sh: runs makensis after ZIP if available
- release.yml: install nsis in CI, upload both ZIP and setup.exe
- Fix Docker registry login (sed -E for https:// stripping)
