[BUG] VS Code extension installation fails with spaces in Windows username

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.61 (Claude Code)
• Operating System: Windows 11
• Terminal: CMD

Bug Description

VS Code extension installation logic fails when Windows username contains spaces. Claude Code incorrectly treats the truncated username path as a VS Code extension ID and attempts to install it, resulting in installation errors despite successful connection.

Steps to Reproduce

1. Have a Windows username that contains spaces (e.g., "nacl fish")
2. Install Claude Code: npm install -g @anthropic-ai/claude-code
3. Install VS Code extension manually: code --install-extension anthropic.claude-code
4. Run Claude Code: claude
5. Check IDE integration status with /config command
6. Observe the installation error in IDE Integration section

Expected Behavior

Should handle usernames with spaces correctly and not attempt to install the truncated username as a VS Code extension ID. Should show proper installation status without errors.

Actual Behavior

IDE Integration • /config
✔ Connected to Visual Studio Code extension
⚠ Error installing VS Code extension: 1: 1 Extension 'c:\users\nacl' not found.
Make sure you use the full extension ID, including the publisher, e.g.: ms-dotnettools.csharp
Failed Installing Extensions: c:\users\nacl

The username "nacl fish" gets truncated to "nacl", and Claude Code incorrectly tries to install "c:\users\nacl" as a VS Code extension ID instead of recognizing it as a file path.

Additional Context

• Manual installation of the extension works: code --install-extension anthropic.claude-code
• The connection shows as successful despite the installation error
• This suggests the issue is in the installation verification/retry logic, not the core functionality
• VS Code version: 1.102.1
• This affects Windows users with spaces in their usernames, which is a common scenario