feat: add runtime implementation of document preview component

[vsgoulart]

Add runtime implementation of the document preview component and missing design fixes

Closes #1327

• This PR adds a new form-js element or visually changes an existing component.
  • => In that case, we need to ensure we follow up on this, e.g. by creating an issue in Tasklist

[Skaiir]

Something potentially to follow up on:

These error states are quite tiny and could benefit of some iconography or something.

[Skaiir]

I think the visuals can be polished but this delivers a bunch of value already and is plenty consistent. Code quality is good as always.