[BUG] /resume doesn't show unnamed sessions after using /rename

Bug Description

After using the /rename command to rename some sessions, the /resume command no longer displays unnamed (non-renamed) sessions in the picker. Only renamed sessions are visible.

Steps to Reproduce

1. Have multiple active sessions (some with default names, some potentially renamed)
2. Use /rename command to rename one or more sessions
3. Use /resume command to view available sessions
4. Observe that only renamed sessions appear in the picker

Expected Behavior

The /resume command should display all available sessions, including:

• Renamed sessions (with custom names)
• Unnamed sessions (with default/auto-generated names)

Actual Behavior

After using /rename, the /resume picker only shows renamed sessions. Unnamed sessions are no longer visible or accessible through the picker.

Environment

• Claude Code Version: 2.1.31
• Operating System: macOS 26.2
• Interface: CLI

Additional Context

• The unnamed sessions may still exist in the session storage directory
• This appears to be a filtering or indexing issue rather than data loss
• Workaround: Unknown - unable to access unnamed sessions after rename operation

Impact

This prevents users from accessing their unnamed sessions after performing any rename operation, potentially causing loss of work context.