React rewrite live + some new features 💪

Build in public day 37/100: We launched the React rewrite and still have some things to polish up. But wanted to share a cool new feature: You can now add check-ins for past days or use it to make check-ins for things you don't tweet (demo below).

This is useful if you happen to log an update past midnight that you need to count for the previous day, or maybe you were away and need to log updates for multiple days.

We tried using AI for this and it's decent but just not consistent enough yet, especially when you work so hard for those streaks 🔥

Along with the rewrite we fixed a ton of stuff along the way and also setup full E2E testing (Playwright, etc.) to be able to deploy faster and with more confidence.

Demo in tweet below since it's too large to upload here.