Add scroll helpers for chat

[sutyum]

• [ ] Scroll up and down through chat (anchored at each user question)
• [x] Add floating buttons at bottom right corner of the screen with up and down arrows
• [x] When the up or down button is held pressed for longer than a second, go all the way to top or bottom respectively

[PrinceBaghel258025]

• need a little help in implementing first task