imsesayflisl-design/Decoded ? reverse-engineered prompt

Build me a VS Code extension called Decoded that helps people understand their coding mistakes instead of fixing them for them.

I want a sidebar chat where I can click on current problems, ask follow up questions, and get simple explanations in plain English about what the error means, why it is happening in my project, how I can fix it myself, and how to avoid it next time. It should watch workspace diagnostics, notice failed terminal commands, and offer a button to explain the error when something breaks. It should also be able to scan the workspace for issues when I open the sidebar or click a scan button.

Make it work in VS Code and other VS Code compatible editors, with a place to enter an API key and support for a few different AI providers. Save chat history locally, stream answers as they come in, and keep everything secure so keys are not stored in settings or logs. If you need current docs for the editor APIs, look them up online first.