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/zh.ts

@@ -277,7 +277,6 @@ export const dict = {
   "language.da": "丹麦语",
   "language.ru": "俄语",
   "language.pl": "波兰语",
-  "language.ru": "俄语",
   "language.ar": "阿拉伯语",
 
   "toast.language.title": "语言",