bt-prioritize-piece=head,tail

## Description Improved the "stream while downloading" feature by prioritizing the download of the first and last pieces of each file (`bt-prioritize-piece=head,tail`) to enable quicker file previews. ## Related Issues None ### Checklist: * [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change? * [x] Have you linted your code locally prior to submission? * [x] Have you successfully run the app with your changes locally?