[FEATURE]: Select multiple cards to perform an action

[rnogueira]

Summary

At the moment merging of cards is done by dragging one by one on top of another. This becomes painful when there is a need to merge multiple cards. Being able to select multiple cards and perform an action such as merge, delete or post as anonymous would be much more friendly.

User story it relates to

None

Basic example

Take the Went Well column in the March 2023 mainboard as an example.
There are 23 cards merged together and they were all merged one by one.

Motivation

It is much more friendly if there is a way to select all the similar cards in the same column and perform an action like "Merge". A nice to have is to be able to undo this action.