feat: Better support for Japanese/ Chinese keyboard

[hiro-v]

Problem

• Context: https://discord.com/channels/1107178041848909847/1223957838678724650/1223957838678724650
• Jan app currently does not support nicely for JP/ CN language while LLM is all about language
• This has negative effect to Jan goal for DAU

Success Criteria

• Allow users with those languages to seamlessly use Jan app
• How to reproduce:
  • Mac -> Language -> Add JP keyboard
  • Enable JP hiragana keyboard
  • Type watashi -> It will show わたし as suggestion. Normally user have to choose by using number then enter, but Enter here in Jan refers to submit message which is not intended

Additional context

• Check this for reference of implementation: https://dninomiya.github.io/form-guide/stop-enter-submit