update jump to latest button with circular design and animation

- add arrow-down-to-line icon
- circular 32px button centered above prompt input
- fade/scale/translate animation on show/hide
- fix duplicate language.ru keys in i18n files

packages/app/src/i18n/de.ts

@@ -284,7 +284,6 @@ export const dict = {
   "language.da": "Dänisch",
   "language.ru": "Russisch",
   "language.pl": "Polnisch",
-  "language.ru": "Russisch",
   "language.ar": "Arabisch",
 
   "toast.language.title": "Sprache",