[ShiTan-677]

The media exporter recursively discovers files but copies them into flat folders using only the basename. Two attachments named same-name in different source directories are reported as two exports while only one survives. Documents, videos and cache images are all affected.

Preserve each file's relative source directory under docs/, videos/ or images/. Root-level files keep their previous paths, and cache images still receive the detected .jpg/.png suffix. Encrypted .dat images continue to be counted and skipped.

Validation on macOS / Python 3.12:

• The three synthetic collision regressions failed before the fix, each reporting two exports but retaining one file.
• python -m pytest -q: 87 passed, 1 skipped.
• Tests verify that both distinct payloads survive for documents, videos and cache images, that root-level paths remain usable, and that encrypted originals are still skipped.
• Compilation, macOS shell syntax and six-tool MCP loading checks passed.

This is an independent CLI export fix; it does not implement encrypted-image decoding or transcript-to-image association. Only synthetic files are used.

The fork CI matrix passed on macOS and Windows with Python 3.10 and 3.13: run 38035161436. The upstream fork-PR workflow still requires maintainer approval.

[freanocank]

Thanks for the fix and regression tests. Adopted through #15 with your original commits preserved. The collision regressions retain distinct document, video and cache-image payloads.

The combined suite passes all four macOS/Windows × Python 3.10/3.13 CI jobs; Windows reports 209 passed, and macOS reports 208 passed with the Windows-only test skipped.