Android: Add preference for full screen reading

[samuelclay]

This came up on the forum but there should be a way to mark a story unread half-way down while reading it without losing scroll position. Maybe I'm overthinking it but should we instead have a full-screen preference with the title section being sticky at the top so the menu button is always visible?

[pavellishin]

Commenting here - I'm the person who left the comment on the forum.

I'm not concerned about losing scroll position - most of the time, if I'm marking a story unread, I'll probably get back to it on the desktop. I mostly want a convenient way of doing so.

Adding a preference option would be great for me.