That's a really fair concern, in fact it's one that's bitten me quite a few times. Can't count the times I stared at a page waiting for an update, only to realize I'm looking at production, or vice versa.

This why I ended up building a small UI overlay to show the current preview and allow exiting the preview and switching between prod/dev modes (in fact I just shipped this yesterday in preparation for the launch since I knew it would make a huge difference to developer experience).

This is not in the demo because it was recorded a while ago, but take a look at this Live Preview I just created to see what it looks like: https://reflame.app/~r/start-preview/?mode=development&varia...