Honestly, I'd go with ubuntu, just because lots of llm tools work with it, and because it has good support for dgpus. I personally use debian, but for your case, i'd go with ubuntu.

I have an AMD 5900HS iGPU and a 3070M in my laptop. I've had no issues on Mint (with the auto-installed Optimus in the Nvidia Prime applet) or with PopOS. If you want to use passthrough, SR-IOV GPU sharing is not an option for AMD iGPUs IIRC, and I know it doesn't work for NVIDIA dGPUs, so you'd need to pass the whole dGPU through to the Windows VM to get hardware acceleration.

For Figma, I would say the unofficial Electron wrapper or the online version is likely your best bet in terms of reliability. If it's just using the browser mechanisms for hwaccel (no funky accessing windows resources behind the scenes) if you run Optimus in the "on-demand" mode the webpage should be able to access the dgpu for hardware acceleration just fine. Optimus is a lot better than it was a few years ago.

I've been using Manjaro for years and highly recommend it.

That said, lenovo build quality has gone way downhill and anyone reading this might want to avoid them in their next purchase.

I had a dual gpu Dell Xps laptop a couple of years ago, and the best experience I had with it was PopOS. It was the only distro that worked with that laptop out of the box without just completely disabling the dgpu.

One thing you probably need to figure out first: how are the dgpu and igpu connected to each other, and then which ports are connected to which gpu.

Everyone does funky shit with this, and you'll sometimes have dgpus that require the igpu to do anything, or cases where the internal panel is only hooked up to the igpu (or only the dgpu), and the hdmi and display port and so on can be any damn thing.

So uh, before you get too deep in planning what gets which gpu, you probably need to see if the outputs you need support what you want to do.