Layers toggle

By popular demand, we've added the ability to toggle PCB layers on and off.

You can do so from Design Reviews -> Files Changed -> Layers at the top of your PCB diffs.

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While the toggle feature will work for any new PRs, note that some legacy cached designs may not toggle correctly initially. We're working on a fix to force clear the cache. In the meantime, clear your browser's cached files manually if you encounter any issues. In Chrome, you can do so from Navbar dropdown -> More Tools -> Clear Browser Cache -> Check "Cached Images and Files"