Claude Code sessions disappear from desktop app sidebar after restart

Describe the bug

Old Claude Code sessions don't persist in the desktop app sidebar. After restarting the app, only the current session appears — previous sessions are gone from the sidebar nav.

Session data is intact — the .jsonl files are all present in ~/.claude/projects/, but the app's session index at ~/Library/Application Support/Claude/claude-code-sessions/ only contains the current session.

To reproduce

1. Open Claude desktop app in Code mode
2. Have a session, close the app
3. Reopen — previous sessions missing from sidebar

Expected behavior

All previous sessions should remain listed in the sidebar's Sessions panel.

Environment

• macOS
• Claude desktop app (sidebarMode: "code")