Allow (un)folding/(un)collapsing of lanes

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Is your feature request related to a problem? Please describe.
In 'other Kanban boards', lanes on a board can be 'collapsed'/'folded', only showing high-level information. Cards can still be dragged into folded lanes.

I am currently migrating a user-base from another Board managing software, and they would appreciate that feature (essentially the only missing piece for full feature parity).

Describe the solution you'd like
As a user, I would like to be able to collapse/decollapse lanes I am currently not working on. I still want to be able to move cards from other lanes and see aggregate/high-level information about the lane.

Describe alternatives you've considered

There are no alternatives considered apart from 'the feature is not there', as this is a UX/QoL improvement.

Additional context

An example of such a feature for another board can be found in a chrome extension for another Deck management software:

https://chromewebstore.google.com/detail/trello-folds-kanban-for-t/egdkjinldbenhgdaodmdcdgknjnljihf?pli=1

The issue is broadly related to #3077 ; However, a new issue was filed as #3077 is comparatively broad, partially stale, and does not propose an explicit solution.

Start by locating the Deck board UI that renders lanes and handles card dragging, then review issue #3077 for related context. The change is done when lanes can be folded and unfolded, folded lanes still accept dragged cards, and they retain aggregate or high-level information while collapsed.