The RobrixSpinLoader component is essentially well-designed to provide a dynamic spinning loading effect. With some optimizations and flexibility enhancements, such as adding dynamic transparency, configurable segment count, and rotation speed control, it can be made more customizable and efficient. Additionally, considering performance, the calculation process can be further streamlined to avoid unnecessary complex calculations during animation frames.

Thanks Aarav, this is a nice addition. I have a few comments:

1. Since this is not Robrix-specific, I think it belongs as an addition to Makepad itself, not Robrix. Then we can use it within Robrix.
2. I showed the animation to a few colleagues, and we all tend to agree that it's very aggressive/jarring, especially at higher speeds. It's almost uncomfortable to watch, as a user waiting on something. Instead, we should use a more relaxed, standard loading spinner animation. I would recommend the "indeterminate circular progress indicator" here, number 2 at this link: https://m3.material.io/components/progress-indicators/guidelines#af0eec4b-39d6-4311-b101-aef0ae6c7078, which is used by both Android and iOS.
3. The size of the spinner should not scale up with the size of the view. If you have a huge full-screen view, such as your ImageViewer, you don't want to show a giant loading spinner that is 800 pixels wide. We still want to show a relatively small one, say 80 pixels in size. Thus, the spinner should scale down to fit smaller views, but should not be larger than a certain maximum size. (This is similar to my comment about Image sizes here)