[iOS] Long-press on sidebar row items to show context menu

I'd love to be able to long-press on items in the sidebar to get a context menu (i.e. to toggle Bookmark, copy text to clipboard, etc).

@connor
Thanks, I agree, a context menu there would be handy. I'm planning to add it. Thanks for your patience.

Added in 1.15.3. Long-pressing a sidebar row now opens its context menu. https://forum.kosshi.app/t/23