How to use plasmo with a side panel?

I was previously using the tabs folder workaround, but it seems that @lab has added proper support for a sidepanel.tsx file (awesome work Louis). I cannot for the life of me figure out how to get this to work even looking at the example.

Is there something obvious I'm missing?

https://github.com/PlasmoHQ/examples/tree/main/with-sidepanel
GitHub
🔰 Example projects that demonstrate how to use the Plasmo Framework and integrate with popular tools - PlasmoHQ/examples
examples/with-sidepanel at main · PlasmoHQ/examples
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