#19736 adjust drag placeholder for document picker

[enkelmedia]

This partially fixes this issue: #19736

Description

This PR fixes the drag-placeholder for document picker to align with the look and feel of the Block List and Block Grid.

Before:

After:

[github-actions]

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[georgebid]

Hey @enkelmedia, this looks great! Thanks for the PR, someone on the core collaborators team will review this soon 😄

[enkelmedia]

@georgebid Thanks a lot! :)

[JasonElkin]

This looks good.

As the aim is to make this look more like the block list and block grid (and there are more editors that #19736 suggests should change too) I feel like the shared CSS for this should be abstracted so it can be shared and modified in one place - like we do with UmbTextStyles?

Let me ask some HQers and see what they say.

[enkelmedia]

I agree with having a "central" thing would be nice but most of the time there needs to be specific selectors etc. which is not really possible by including a shared style.

I did consider that but felt like it would work for 50% of the cases and that felt worse than having it duplicated.

But, any concrete ideas are more than welcome and I'd be happy to update the PR accordingly :)

Cheers!