fix: quote editor launch args on Windows to support paths with spaces

[D3OXY]

Summary

Fixes #1804

"Open in Editor" breaks on Windows when the project path contains spaces (e.g. C:\bug showcase). The editor receives each space-separated word as a separate argument, opening multiple file tabs instead of the project folder.

Root cause: launchDetached in apps/server/src/open.ts uses shell: true on Windows so editor commands are resolved via PATH. When Node's spawn passes args through the shell, unquoted spaces in paths are treated as argument separators.

Fix: Wrap each argument in double quotes on Windows before passing to spawn(), so the shell keeps paths with spaces intact. Non-Windows platforms are unchanged (they don't use shell: true).

Test plan

• On Windows, create a project at a path with spaces (e.g. C:\Users\test\My Projects\app)
• Click "Open in Editor" → editor should open the folder, not individual word-tabs
• Verify paths without spaces still work as before on Windows
• Verify no behavior change on macOS/Linux

Note

Fix editor launch args quoting on Windows to support paths with spaces

In open.ts, each argument passed to the detached editor process is now wrapped in double quotes when running on Windows, fixing failures when paths contain spaces. Non-Windows behavior is unchanged.

^{Macroscope summarized 3f993c9.}

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[macroscopeapp]

Approvability

Verdict: Approved

This is a straightforward, self-contained bug fix that adds proper quoting for Windows paths with spaces when launching editors. The change is limited to a single spawn() call and follows a well-known pattern for Windows shell compatibility.

^{You can customize Macroscope's approvability policy. Learn more.}