Horizontal analysis bar for mobile WebApp/PWA

[NamelessGO]

Beginners may find the +- x,y difficult to verify blunders and brilliant moves. Adding a bar to Lichess Web App would be a fantastic feature, and if it cannot be implemented in PWA, this may be a recommendation for Lichess Mobile v2.

https://discord.com/channels/280713822073913354/1194124229747155025