Recognize installed copies from Windows paths on any platform
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isInstalledCopy split the root with the platform's path module, so on Linux it couldn't read a Windows root and the panel test failed in CI. path.win32 splits on both separators.
Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Entire-Checkpoint: 01M6CDJXJ2TFGFKJD62HGRH81H
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