fix(markdown): Windows paths in messages keep their backslashes (#21069)

Co-authored-by: OhadC <4123639+OhadC@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
834f0e3a1bDara Adedeji committed on 10/18/2026, 8:12:05 PM· committed by GitHubparentd6841e9
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