chore: add `dev/build` script command

[btea]

Overview

https://pnpm.io/pnpm-cli#-c-path---dir-path

Add relevant script commands directly in the package.json in the root directory for quick and easy execution without having to manually enter the specified folder.

Manual Testing

Related Issue

This PR closes #<issue_number>

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[aklinker1]

Actually, no, I don't want a build script in the root of the monorepo that only builds a single package, even if it's the main one. The other changes are fine. But why not just use pnpm --filter wxt build or pnpm --filter wxt-demo build?

[btea]

Yeah, the effect should look the same.