Session not appearing in sidebar despite valid session file on disk

**Problem description**
A Claude Code session does not appear in the app's sidebar for the corresponding project,
even though the session file exists correctly on disk.

**Environment**
- OS: Windows 11 Pro (10.0.26200)
- Project/cwd: C:\Users\Patrick
- Session ID: 00a02173-0c1a-4be0-9010-4a1480e95bb1

**Verification performed**
The session file exists in the expected location:
C:\Users\Patrick\.claude\projects\C--Users-Patrick\00a02173-0c1a-4be0-9010-4a1480e95bb1.jsonl

In other words, the data is intact — the issue appears to be purely a sync/display problem
in the app's sidebar, not data loss.

**Troubleshooting attempted**
- Restarting the app (fully closing and reopening)
- `claude --resume 00a02173-0c1a-4be0-9010-4a1480e95bb1` as a terminal workaround

**Expected behavior**
The session should appear in the sidebar when selecting the C:\Users\Patrick project.

Start by reproducing the missing-session behavior for the C:\Users\Patrick project with the session file at C:\Users\Patrick\.claude\projects\C--Users-Patrick\00a02173-0c1a-4be0-9010-4a1480e95bb1.jsonl. Compare the sidebar result with `claude --resume 00a02173-0c1a-4be0-9010-4a1480e95bb1`; done means the existing session appears in the sidebar after selecting that project.

Written by the indexing model from the issue text.