Icon for done cards in compact mode without due date

[reox]

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Is your feature request related to a problem? Please describe.

The new "mark card as done" feature is great! However, the indication that a card is marked as done can only be seen in the expanded view and not in the compact view.

Describe the solution you'd like

A checkbox symbol could be added, such that it is possible to spot done cards in the compact view as well

Describe alternatives you've considered

The card could also be highlighted green. However, if something like #3592 is every implemented, that might interfere with it.

Additional context
Done card in normal mode:

Done card in compact mode:

Mockup of done card in compact mode:

Other mockup using background color:

[reox]

I just noticed, that the icon is only missing if no due date was set before. If a due date was set, the card will look like this:

-->

I think there are two possible solutions:

1. Use the same icon if the card was marked as done but no due date was set
2. use a different icon in that case, to hightlight that this card was done even if no due date was set (not sure if that comes handy for anyone though)

[juliusknorr]

We should just use the same icon as with a due date as in the non-compact view