MrXujiang/h5-Dooring ? reverse-engineered prompt

Build me a web app for making H5 landing pages visually, like building with blocks.

I want a drag and drop editor where I can add text, images, video, buttons, forms, and other common page elements onto a phone sized canvas, then edit each item in a settings panel. It should support multiple pages, copy and delete sections, undo and redo, quick preview, and a template library so people can start from a design and customize it.

Please also include basic animation and interaction options, data source handling, and a simple way to collect form submissions and view them later. I’d like the app to feel polished enough for non technical users, with clear controls and a smooth editing experience.

If there’s an existing backend or deployment setup in the repo, wire the editor into it so pages can be saved, updated, previewed online, and exported or downloaded when needed. Use the current docs online if you need to confirm how the project is meant to run.