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

Bug Description
Expected Behavior:
Should handle usernames with spaces correctly and not attempt to install the truncated username as an extension ID

Actual Behavior:

1. Username "nacl fish" gets truncated to "nacl"
2. Claude Code incorrectly tries to install "c:\users\nacl" as a VS Code extension ID
3. Installation fails with extension not found error
4. However, the connection status shows successful (✔ Connected to Visual Studio Code extension)

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: /config
6. Observe the installation error despite successful connection

Root Cause:
The installation logic incorrectly parses usernames with spaces and treats the truncated path as an extension ID to install.

Impact:

• Confusing error messages for users with spaces in Windows usernames
• May affect users' confidence in the integration even when it's working
• Installation logic needs proper path handling

Additional Context:

• Manual installation works: code --install-extension anthropic.claude-code
• Connection appears successful despite installation error
• This suggests the issue is in the installation verification/retry logic, not the core functionality

Environment Info

• Platform: win32
• Terminal: vscode
• Version: 1.0.61
• Feedback ID:

Errors

[{"error":"Error: 1: 1 Extension 'c:\\users\\nacl' not found.\nMake sure you use the full extension ID, including the publisher, e.g.: ms-dotnettools.csharp\nFailed Installing Extensions: c:\\users\\nacl\n\n    at oO6 (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1345:4765)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async sO6 (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1345:2187)","timestamp":"2025-07-26T13:19:39.457Z"},{"error":"Error: 403 {\"error\":{\"type\":\"forbidden\",\"message\":\"Request not allowed\"}}\n    at i4.generate (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1317:7866)\n    at DP.makeStatusError (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1334:2101)\n    at DP.makeRequest (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1334:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2025-07-26T13:21:29.281Z"},{"error":"AxiosError: Request failed with status code 403\n    at kq (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:676:1077)\n    at Unzip.Y0 (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:677:9955)\n    at Unzip.emit (node:events:530:35)\n    at Unzip.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1698:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at x21.request (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:679:2088)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async gQ8 (file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1539:467)\n    at async Promise.all (index 0)\n    at async file:///C:/Users/nacl%20fish/AppData/Roaming/nvm/v22.17.0/node_modules/@anthropic-ai/claude-code/cli.js:1525:6171","timestamp":"2025-07-26T13:21:29.600Z"}]