[BUG] Chat history empty when workspace is on a mapped network drive (Windows)

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?

Chat history panel shows an empty list after VSCode restart when the workspace folder is on a Windows mapped network drive.

What Should Happen?

The hP() function in extension.js calls fs.realpath() to normalize the project path. On Windows, when a workspace is on a mapped network drive (e.g., T: → \\server\share), fs.realpath() resolves the drive letter to the UNC path:

Input: t:\rob.a\sfk
fs.realpath() output: \\almaalpinex-10\it\rob.a\sfk
The tq() function then maps this to directory name --almaalpinex-10-it-rob-a-sfk, while sessions were originally saved under t--rob-a-sfk. Since these don't match, Ij() returns undefined and fetchSessions returns an empty array.

Error Messages/Logs

Steps to Reproduce

1. Map a network share to a drive letter (e.g., net use T: \\server\share)
2. Open a workspace folder on that drive in VSCode
3. Start a Claude Code conversation
4. Close and reopen VSCode
5. The chat history panel is empty (but .jsonl session files exist in ~/.claude/projects/)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.79

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Environment
Windows 11 Pro
Claude Code extension v2.1.79
Non-admin user account
Workaround
Create a directory junction in ~/.claude/projects/ from the UNC-mapped name to the drive-letter name:

mklink /J "\\?\C:\Users\<user>\.claude\projects\--server-share-path" "\\?\C:\Users\<user>\.claude\projects\t--path"
Suggested Fix
Either:

Don't use fs.realpath() for the project path mapping (use the path as provided by VSCode)
Or normalize both the save and load paths consistently (always use realpath or never)