Fix ZIP export to open the parent folder of the exported project

[bicodrex]

The previous implementation opened the generated ZIP file directly after export, leading to inconsistent and undesirable behavior across platforms:

• Windows: Behavior depends on the configured default handler. The default is Explorer, which shows the archive view, but third-party tools open their own archive UI, making it harder to locate the parent directory.
• macOS: Opening a ZIP file triggers automatic extraction by default, so the exported archive would be immediately unpacked.
• Linux (most distributions): The ZIP file opens in the configured archive manager, showing its contents instead of the containing folder.

This change opens the parent directory of the exported ZIP, providing more consistent behavior across platforms. It also aligns with how Desktop.getDesktop().open(...) is used elsewhere in the repository, for example in DiscoPlatformIt.java.

[matthiasblaesing]

Looks sane to me. But the wording seems off. I read "of the exported project" as meaning to open the folder where the project resides, not where the zip file is placed.

Wouldn't make "Fix ZIP export to open the parent folder of the exported zip file" make this clearer? What do you think?

However. This is a nitpick. The change makes sense to me, as I was annoyed multiple times because I wanted to get to the final zip and instead the archive programm was opened.

[bicodrex]

I agree, it is clearer with "exported zip file"