The beta.13 clap parser ignores unknown --force-device-scale-factor flags
and CEF Args::new() starts empty, so CLI flags never reach the CEF subprocess.
Patch src/webview/mod.rs to read STREMIO_FORCE_DEVICE_SCALE_FACTOR and pass
it to CEF via append_switch_with_value. Remove failed GTK4/master branch
build attempt (requires GTK 4.22 not yet in nixpkgs).
