fix: quote editor launch args with spaces on Windows

[C-W-D-Harshit]

What Changed

Quote arguments containing spaces when launching editors on Windows.

Why

On Windows, spawn uses shell: true to resolve .cmd/.bat editor commands (like code.cmd for VS Code). This causes the shell to split path arguments at spaces, so a path like C:\Users\John Doe\project opens two separate buffers instead of one.

Prior attempts

• Quote cwd when building editor command args #775 quoted args on all platforms, which broke macOS (quotes became part of the path string when shell: false)
• fix: handle spaces in file paths for Open in Editor #849 quoted all args on Windows, even those without spaces

This PR only quotes args that contain spaces, and only when shell: true (Windows). Non-Windows platforms pass args as arrays and are unaffected.

Fixes #757

Checklist

• This PR is small and focused
• I explained what changed and why

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