Greptile Summary

This PR adds Windows file path normalization to the media deduplication logic in filterMessagingToolMediaDuplicates, ensuring that paths represented as local Windows paths (e.g., C:\tmp\photo.jpg) and their file:// URL equivalents (e.g., file:///C:/tmp/photo%20one.jpg) are treated as the same file during dedupe.

The implementation introduces normalizeFilesystemPathForDedupe, which handles three normalization steps in sequence: replacing backslashes with forward slashes, stripping a leading / before a drive letter (as produced by URL pathname parsing), and lowercasing the drive letter. The existing normalizeMediaForDedupe is updated to apply this normalization for both local paths and decoded file:// URLs.

• The normalization logic is correct for all described cases: backslash vs. slash separators, file:///C:/... vs. C:\.../C:/... forms, and drive-letter case differences.
• The two new tests are well-targeted and verify the key Windows-specific equivalence scenarios.
• The normalizeFilesystemPathForDedupe helper is defined as a nested function inside filterMessagingToolMediaDuplicates, consistent with the pre-existing normalizeMediaForDedupe pattern.
• UNC file URLs (file://server/share/path) are handled gracefully: the parsed.host branch reconstructs a //server/share/path path, and the drive-letter regexes correctly leave such paths unchanged.
• No regression risk for existing Unix-style path deduplication — paths not matching the drive-letter patterns pass through unchanged.

Confidence Score: 5/5

• This PR is safe to merge — it is a focused, additive normalization fix with no behavioural regressions for existing paths.
• The normalization logic is correctly ordered (backslash → slash, leading-slash strip for URL-parsed pathnames, drive-letter lowercase), the regex conditions are non-overlapping and terminate cleanly, and all existing tests continue to pass. The two new tests directly exercise the new code paths. No security surface is affected, and the change is scoped entirely to internal dedupe comparison logic.
• No files require special attention.

_{Last reviewed commit: 98731af}

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