Polygon: Use inner instead of outer radius

When creating a polygon, I often want to be able to create it with a radius based on the middle segment. For example, with hexagons:

### What the radius currently sets

### What I want to set as the radius

I don't know how this should be implemented. Should it be a toggle? It could be a simple custom component with a relatively simple trigonomery node also. Should it be implemented directly within the editor?

I currently don't realize what is the scope of these nodes. Should they be general? Should the provide the bare minimum to be composable into any wanted node?

Start by locating the polygon-creation nodes in the editor and reviewing how their current radius is defined. Compare the existing outer-radius behavior with the requested middle-segment radius, then determine whether the result should be a toggle, a custom component, or composable trigonometry nodes. Done requires an agreed scope and a way to create polygons using the inner radius.

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