fix: fix path of cli companion server config

[kapsner]

fix path of cli companion server config to 'os.tmpdir()/gemini/ide/' according to https://github.com/google-gemini/gemini-cli/blob/7a720375729cc1e5b92ec02910a2fa8be77aa05d/docs/ide-integration/ide-companion-spec.md?plain=1#L38

and

https://github.com/google-gemini/gemini-cli/blob/7a720375729cc1e5b92ec02910a2fa8be77aa05d/packages/core/src/ide/ide-client.ts#L598

Summary

Fixes issue with connectiin to vscode cli companion and gemini running on remote ssh / inside container.

Details

Gemini cli searches for IDEserver configs at 'os.tmpdir()/gemini/ide/'. The companion extension previously created the files at 'os.tmpdir()', leading to a mismatch of the expected file path and resulting connection issues.

Related Issues

Fixes #10473

How to Validate

• Pull this patch
• cd gemini-cli
• npm install
• npm audit fix
• cd packages/vscode-ide-companion
• npm run build
• vsce package --no-dependencies
• code --install-extension gemini*.vsix

Pre-Merge Checklist

• [ ] Updated relevant documentation and README (if needed)
• [ ] Added/updated tests (if needed)
• [ ] Noted breaking changes (if any)
• [ ] Validated on required platforms/methods:
  • [ ] MacOS
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
    • [ ] Podman
    • [ ] Seatbelt
  • [ ] Windows
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
  • [ ] Linux
    • [ ] npm run
    • [ ] npx
    • [ ] Docker