djbatalona06/HeartBeat ? reverse-engineered prompt

Build me a cute couple tracker web app that feels like a little game, not a boring planner.

I want two people to pair up with an invite link, then share daily moods, workouts, productivity, and notes in one place. The home screen should have a little pet or companion that grows when either person logs something, and gets upset when we ignore it. Include sections for today, shared tasks, a partner view, calendar syncing, and a workout log with photo proof. It should work like a phone app, install to the home screen, and send reminders or notifications even when it is closed.

Please make the design playful and themed, with a few fun style choices the couple can switch between, plus light and dark mode. Keep it simple to use, privacy friendly, and make sure both people see the same shared records without needing accounts if possible. If you need to look up current PWA or notification docs online, go ahead.