feat(files): export markdown as zip with embedded images #4413

Bugbot Review

Bugbot Analysis Progress (7m 58s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (7m 51s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_86cc2326-62fa-4365-a31d-f71a2272c6b8

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 76a07aa. Configure here.}