maybe add a dolphin screenshot as well with the + on hover? (or folderview)

There is a dolphin screenshot with the hover in the desktop section, (line 48+)

Since this is a command pattern, shouldn't this link to command patterns instead of navigation patterns?

I'd add a screenshot of the swipelistitem here as well

swip -> swipe

My intention was to suggest switching to a navigation pattern like "Master-Detail" or "Column-based navigation", so each item has its own content page where more actions could easily be displayed.

What kind of command pattern would you suggest could replace the 3+ actions?

Ah okay, now I understand what you mean. I don't think that becomes clear through that wording, however.

In any case, it's the command pattern that is directly affected by the number of actions. It is true that the command patterns that work well for for more than three actions usually necessitate a deeper hierarchy, but that is then the next step. The first decision is which command pattern to choose, and that can be for example a context drawer or controls within content.

So I'd still suggest to change it to a link to command patterns. Once the designer has chosen a suitable command pattern, then they have to figure out which navigation pattern best suits that.