Support non-English (e.g. Korean) session title auto-generation

Summary

When conversations are primarily in a non-English language (e.g. Korean), the auto-generated session titles are still in English. It would be helpful if the session title language matched the conversation language or could be configured by the user.

Use case

Users who work primarily in Korean (or other non-English languages) find English titles harder to scan and identify sessions at a glance.

Suggested options

• Auto-detect conversation language and generate title accordingly
• Add a setting like sessionTitleLanguage in settings.json

Environment

• Claude Code Desktop (Windows)
• Primary language: Korean