fix(preview): release original browser downloads after saving copies (#18435)

Co-authored-by: SAPHID <saphid@users.noreply.github.com>
Co-authored-by: GPT-6.1 Sol <noreply@openai.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
4a6cd8defaAlex Southwell committed on 10/20/2026, 12:28:09 AM· committed by GitHubparentb494887
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