Persistent backup file warning on every launch

Description

On every launch, Claude Code displays a distracting warning about a backup file:

A backup file exists at: C:\Users\<user>\.claude\backups\.claude.json.backup.1772125532408
You can manually restore it by running: cp "C:\Users\<user>\.claude\backups\.claude.json.backup.1772125532408" "C:\Users\<user>\.claude.json"

This message appears repeatedly across sessions even when nothing is wrong with the config. It seems like the backup is created during normal config read/write and the warning is never cleared automatically.

Expected behavior

• Backup files from normal operation should be cleaned up automatically, or
• The warning should only appear if the config file is actually corrupted/missing, not on every launch

Environment

• OS: Windows 11 Pro (10.0.26200)
• Claude Code: latest
• Shell: bash (Git Bash)