test(cmd): add comprehensive URL detection tests for command panel
Tests cover all URL detection scenarios:
- Domain without protocol (youtube.com) → normalized to https://
- http:// URLs → opened as-is
- https:// URLs → opened as-is
- localhost with port → normalized to https://localhost:port
- Non-URL text → not detected as URL (negative test)
Tests verify:
- URL detection regex works correctly
- Window opens after URL is detected
- URL is properly normalized before opening
- cmd panel closes after opening URL
- Non-URLs don't trigger URL opening
Related to fix in rpmrxoow (URL detection regression from command refactor)