feat: redesign batch actions

[JammingBen]

Changes the appearance of the batch actions to match the redesign mocks.

This also tidies up the implementation a bit by removing the CreateAndUpload component:

• The relevant upload-related parts don't need a template, so they have been moved to a composable that gets invoked by GenericSpace.
• The clipboard relevant actions are implemented as proper file actions that are rendered via the existing batch actions extension point.

closes #2022

[tbsbdr]

i like! could you please double-check with the design - I think we need a bit more whitespace within the bar

[AlexAndBear]

Hm, somehow I like the original more then the redesign, it doesn't look visually appealing to me.

Anyways, can we apply the deselect click handler around the x icon and the text, so it's easier to reach ?