ml4den/PromptCanvas ? reverse-engineered prompt

Build me a simple web app for creating and using prompt templates in YAML. I want to be able to load a template, fill in the fields, and instantly generate a finished prompt that I can copy into an AI chat. It should also let me edit templates visually, add fields, remove them, reorder them, and save the result back out as a YAML file.

Keep everything running in the browser, with no server, so my data stays private. The app should support the field types described in the README, like text, number, yes or no options, and lists, and it should preserve any saved values when I upload an existing YAML file. Please make the interface clean and easy to understand, with a prompt generator view, a schema editor view, and a simple guide page or help section. If you need to check anything about YAML handling or browser file upload behavior, look up current docs online.