no namespace is added when pasting images from iphone

[pferronato]

Issue Description

I'm using an iPhone 16 Pro with iOS 26.01.
I open the Photo App, open an image, select "Copy" from the "...." menu, open an editable page in DokuWiki using Safasi and do a paste. In this case, the namespace is not appearing; only the ":" is left. If I do it from Firefox on macOS, the namespace is correctly added.