Mobile: add ability to choose a collection for an object when pressing & holding

To make organisation easier on mobile, I would appreciate easier ways to quickly sort objects (e.g. into collections) without having to click on each one.

Capacities v1.71.39 (Nightly); Apple iPhone; iOS v18.7; WebKit v605.1.15 (WebKit v605.1.15); Mobile (Capacitor); 23/10/2026, 21:43:04