I use Groupy by Stardock for this. It’s a neat little tool that lets you make pretty much any application into a tab by grouping them.
It isn’t open source nor free though, and I didn’t even realize there was a Groupy 2 until I searched it to get you a link. For something I use daily, it was worth it for $10.
Copilot / LLM code completion feels like having a somewhat intelligent helper who can think faster than I can, however they have no understanding of how to actually code, but are good at mimicry.
So it’s helpful for saving time typing some stuff, and sometimes the absolutely weird suggestions make me think of other scenarios I should consider, but it’s not going to do the job itself.