GetMural/Mural ? reverse-engineered prompt

Build me a desktop app for visual storytelling that lets people put together a story like a storyboard, rearrange the order of the scenes easily, and preview how everything will look before publishing.

I want each story to support a mix of full screen images, text, audio, and video, and I want the app to generate the files needed to publish the story on a normal web server in a way that works in modern browsers. There should be a clean editor where I can see the sequence of the story, test the elements, and make changes without needing to know code.

When the story is ready, the app should let me download a ZIP with all the output files, including the HTML, CSS, JavaScript, media, and the data the app uses internally. Use Electron for the desktop app, and if you need to, look up any current docs online to make sure the setup works well.