[FEATURE] Companion (Dross) language should respect the "language" setting

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

## Summary
The language setting in settings.json (e.g., "language": "korean")
applies to Claude's responses, but the companion duck (Dross) speech bubbles
still appear in English.

## Expected behavior
When language is set to a non-English language, the companion's speech
bubbles should also appear in that language.

## Current behavior
Companion speech bubbles are always in English regardless of the language setting.

## Environment

• Claude Code version: 2.1.92 (Claude Code)
• Platform: Windows 11

Proposed Solution

Allow the companion (Dross) speech bubbles to use the language
specified in the language setting in settings.json.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_