feat(mothership): restore attachment previews on draft and add video support #4435

Bugbot Review

Bugbot Analysis Progress (6m 42s elapsed)

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✅ Completed bug detection (6m 36s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_7a9fe867-53ac-4798-b6bf-294f01553429

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit edcf1d2. Configure here.}