RowanThistlebrooke/dashboard — reverse-engineered prompt

Build me a simple personal dashboard as a clean HTML web page that I can use on both my phone and my computer. I want it to feel like a small weight tracking app, not a complicated fitness platform. Let me add a weight entry with a date, see my recent entries, edit or delete mistakes, and get a clear view of my progress over time with a simple chart or visual summary. Make the layout responsive so it looks good on a small phone screen and on a desktop screen.

Please keep it easy to run, ideally just opening the HTML file in a browser. Save the data locally in the browser so it does not disappear when I refresh. If there is a realistic lightweight way to sync between phone and computer, add it, otherwise include a simple import and export option so I can move my data between devices. Make it polished, calm, and beginner friendly.