AiSharath/CodeChronicle ? reverse-engineered prompt

Build me a web app called CodeChronicle that lets me replay JavaScript code execution like a video.

I want to paste in some JavaScript, run it, and then scrub through the execution step by step with a timeline or slider. As I move forward or backward, the app should show me the current line, highlight it in the code editor, and display the values of variables at that moment so I can understand exactly what changed.

It should handle normal control flow like if statements, for loops, and while loops, and it should feel smooth and visual, not like a plain console. Use a modern React frontend with an embedded code editor, and a Node backend that can safely run the code in a Docker sandbox. If you need to look up current docs for any of the libraries or tools, go ahead and do that.

Make it polished enough that I can use it as a real debugging and learning tool.