feat: Create Chrome extension for Cobalt video downloader

[d3f4ultt]

This commit introduces a Chrome extension that provides a side panel interface to facilitate video downloads using Cobalt.

Key features:

• A side panel UI with an input field for video URLs and a download button.
• Redirects you to the Cobalt website (cobalt.tools) with the video URL for processing.
• Basic URL validation and error handling for your input.
• Includes necessary manifest.json, HTML, CSS, and JavaScript files.
• Placeholder icons are included.

The extension allows you to quickly send video URLs to Cobalt directly from your browser's side panel.

[KwiatekMiki]

1. why should this be in the main repo instead of a separate one
2. why is it in the root folder instead of a folder just for it like everything else
3. why did a bot commit this for you (and probably also made this pr)
4. images don't work
5. Why are there uppercase letters? Cobalt is 99.99% lowercase.
6. what is this styling
   if it wasn't for the "cobalt" written i wouldn't even think that it's cobalt (it's not hard to make it look at least a little like cobalt)
   
7. the comments literally scream "i used ai to write this"
8. the url validation doesn't even work, which makes the extension unusable
   
9. why does it redirect you to cobalt (which has a built-in url validation btw), can't you use an api or iframe cobalt?

and i could continue pointing out bad stuff with this pr

please don't fill github the internet with ai slop this bad