Add companion/buddy (Waffleth) language configuration

Feature Request

Description

The companion/buddy feature (Waffleth ghost) currently displays all messages in English. There's no way to configure the language of companion messages.

Current behavior

• settings.json supports "language": "Español" for Claude Code UI
• Waffleth's speech bubble messages are always in English regardless of the language setting

Requested behavior

Add a configuration option to translate companion messages to the user's configured language. This could be:

• Automatically use the existing language field from settings.json
• Or add a dedicated companionLanguage field

Example

{
  "language": "Español"
}

Should also make Waffleth speak in Spanish (or whichever language is configured).

Context

Users working in non-English environments would benefit from having the full UI experience in their language, including the companion messages.