Localization: Translate 'Recents' section label to Japanese

Summary

The sidebar section label 'Recents' is not translated to Japanese, while other UI elements (e.g., 'もっと見る') are already localized.

Steps to Reproduce

1. Use Claude Code desktop app with Japanese locale
2. Observe the left sidebar

Expected Behavior

'Recents' should be displayed as '最近' (or an equivalent Japanese term)

Actual Behavior

'Recents' is displayed in English

Environment

• Platform: Windows 11
• App: Claude Code desktop app

Additional Context

This appears to be a partial localization gap — some labels are already in Japanese, suggesting 'Recents' was missed during translation.