fix: hide Windows console when launched from Explorer

[vasiltop]

Summary

• Detach the Windows console at startup when this process is the only one attached (Explorer double-click / Start menu).
• Keep the console when launched from an existing terminal so stdout/stderr still work.

Test plan

• On Windows, double-click editor.exe — SDL window opens with no console
• From cmd/PowerShell, run editor.exe — console stays attached and stderr still prints
• Open a file via CLI (editor.exe path\to\file) still works

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