feat: provide a quick view for Deck cards in Nextcloud Calendar

[gerbrent]

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Problem
When viewing Calendar items, the expected behaviour when clicking any calendar item is a quickview editor:

However, clicking on a Deck calendar item currently redirects to a different app.

Describe the solution you'd like
Every Calendar item when clicked should provide the user with a similar, expected behaviour: a quickview edit mode to modify the item.

Describe alternatives you've considered
🤷🏻

Additional context
Clicking a Deck item in Calendar currently redirects the user to a different app, i.e. Tasks currently, see Deck#4878 and Calendar#6122

[luka-nextcloud]

This feature sounds useful 👍