[Idea]: Direct .zip import for custom runners

[iharuya]

Overview of the requested feature

Installing runners from the Runner Gallery is currently a bit tedious as users have to manually unzip and select image files.

An option to import a runner by simply selecting (or dragging & dropping) the downloaded .zip file directly within the app.

Thank you for your great work on RunCat!

Reason for the request

I want to make custom runners and encourage people to actually use it.

Related Issues

No response

Check List

• I have read the CONTRIBUTING.md and agree to follow it.
• The proposed feature is beneficial to a wide range of users and not just a personal preference.
• Checked that no similar requests already exist.

[ToooAir]

I also wish that user can import runners from RunCat Classic, as I lost those image of my custom runner.