feat(SearchVideos): modify Lightbox to pause the prev video when sliding

[hacking-racoon]

Summary

• When you're watching a video in the Lightbox and slide to the next one, the previous video keeps playing.
• The sound doesn’t stop either, which gets in the way of the new video.

Solution

• Added logic to manage the video iframe's index and ref using useState and useRef, ensuring the previous video stops playing when sliding to the next one.

@ItzCrazyKns Merry Christmas!

[ItzCrazyKns]

Happy belated new year! Hope you had great holidays, I certainly did. The changes looks good to me. Thank you very much!