Add option to hide build number in version display

[iTarek]

Currently Bundle.versionBuild in Bundle+Ext.swift hardcodes the format as "(version) ((build))", and HeaderView uses this directly. There's no way to show only the version number without the build number.

Not every app uses meaningful build numbers — some keep it at "1" for every release, or use it only internally. Showing "(1)" or "(427)" next to the version adds visual noise that isn't useful to end users.

Suggestion:

Add a showBuild parameter (default true for backward compatibility):

SwiftNEW(
    show: $showNew,
    showBuild: false  // hides the build number
)

Or alternatively, make HeaderView conditionally format:

static var versionOnly: String {
    Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0"
}

I created PR
#19