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/ja.ts

@@ -277,7 +277,6 @@ export const dict = {
   "language.da": "デンマーク語",
   "language.ru": "ロシア語",
   "language.pl": "ポーランド語",
-  "language.ru": "ロシア語",
   "language.ar": "アラビア語",
 
   "toast.language.title": "言語",