[Feature Request]: Drag and drop support in project list

### Feature Description

Using the Grouped view on the project list page, it would be nice to drag unassigned projects into the correct group instead of manually assigning them in the edit popup.

Additionally, if drag-and-drop is implemented. Maybe we can also make it possible to override the order of the projects. This, however, requires some extra thoughts on how the current automatic sorting system should work.

### Is this feature valuable for other users as well and why?

I think so. It's a small detail that improves productivity. Especially when you are assigning multiple projects in one go.