Fix scoped CSS in apps

[padarom]

Currently we can't use <style scoped> tags in our applications. If it is used, the style is just not applied at all.

If scoped is omitted we do have the same issue as we have in regular Vue though, where the same classes override each other in different components. So if app A defines the class .foo, it will also style all elements with the class .foo in app B.

Temporarily just develop apps by themselves so that this can't become an issue, but fix it in the future while also requiring all other apps to only use scoped styles.