adjust UI for 6 inch devices

[calin-darie]

• [x] spec ready for first development
• [x] technical tasks defined
• [x] first app store release
• [x] tested and approved in app store

[calin-darie]

Love Gentle Glow on the Poke 3!

https://www.reddit.com/r/Onyx_Boox/comments/r6pgt5/tip_dont_install_gentle_glow_for_boox_on_a_boox/