[BUG] [WEB] Video previews in Gridview keep downloading, even if they are not visible anymore. #875

Describe the bug
If I scroll through my assets and hover over an video, it starts to download and preview it, which is a great feature.

The Prolbem is, that it does not stop to download the video, even, if I scrolled away from that video, which makes previewing images very slow, since it blocks my bandwidth.

To Reproduce
Steps to reproduce the behavior:

1. I installed Immich through docker-compose
2. Placed an Nginx reverse proxy for ssl in front of it.
3. Upload assets from my phone
4. In Web: Hover over an video and scroll down. Keep an eye on networktraffic of my machine.

Expected behavior
The download of the video stops, as soon as I stop hovering with my mouse over an video (or at least as soon, as it is no longer visible in the browser through scrolling.

Screenshots
If applicable, add screenshots to help explain your problem.

System

• Server Version: <1.33>
• Mobile App Version: <1.33>

Additional context
Browser is Firefox on MacOS 13