[BUG] Desktop app (Windows): Sidebar shows no past sessions across all projects

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

On the Windows desktop app, the sidebar does NOT display ANY past sessions — not just recent ones, but ALL past sessions across ALL projects are missing. Only the currently active session is visible. The "See more" (もっと見る) link is grayed out and cannot be clicked.

Restarting the desktop app did NOT fix the issue.

However, session files DO exist on disk:

• ~/.claude/projects/C--Users-baru1-Hub/ contains multiple .jsonl files (4/14, 4/17, 4/18)
• ~/.claude/projects/C--Users-baru1/ exists with sessions
• ~/.claude/projects/C--Users-baru1-Downloads/ exists with sessions
• ~/.claude/projects/C--Users-baru1-OneDrive--------Zoom/ exists with sessions
• ~/.claude/projects/--192-168-0-252-7-Director-ClaudeCode------/ exists with sessions

None of these are shown in the desktop app sidebar under any project group.

Workaround: claude --resume from CLI works correctly and lists all sessions, so the issue is isolated to the desktop app's sidebar UI.

Possibly related to #43674, but the scope here is broader (all sessions across all projects, not partial loss).

What Should Happen?

The sidebar should list past sessions for each project group, with a working "See more" expansion to load older sessions. All sessions that exist on disk under ~/.claude/projects/ should be visible in the UI.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code desktop app on Windows
2. Look at the left sidebar under the "Hub" project group
3. Observe: only the current session is listed
4. Observe: the "See more" (もっと見る) link is grayed out and cannot be clicked
5. Open file explorer and navigate to C:\Users\<user>\.claude\projects\C--Users-<user>-Hub\
6. Confirm multiple .jsonl session files exist that are NOT shown in the sidebar
7. Run claude --resume from a terminal — all sessions list correctly, confirming data is intact

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.3109.0.0 (Claude Desktop App for Windows, MSIX)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

The issue persists across app restarts. All past session data is intact on disk but invisible in the UI. This breaks the core value of the desktop app's session history feature for this user, as the CLI workaround (claude --resume) is required for all past session access.