[css-sizing-4] min/max size transfers across aspect-ratio

https://drafts.csswg.org/css-sizing-4/#aspect-ratio-size-transfers

Sizing constraints in either axis (the origin axis) are transferred through the preferred aspect ratio to the other axis (the destination axis) as follows:

First, any definite minimum size is converted and transferred from the origin to destination axis. This transferred minimum is capped by any definite preferred or maximum size in the destination axis.

Then, any definite maximum size is converted and transferred from the origin to destination. This transferred maximum is floored by any definite preferred or minimum size in the destination axis as well as by the transferred minimum, if any.

I think these should be defined as only impacting automatic or content-based sizes, rather than being defined as being an independent constraint clamped by the preferred size, because e.g. Flexbox makes a distinction between a size constraint applied to the "minimum size" vs a size constraint applied to the "preferred size" and it's otherwise not clear how this independent constraint would apply.

Start with the CSS Sizing Level 4 section at https://drafts.csswg.org/css-sizing-4/#aspect-ratio-size-transfers, then read the issue's comment thread to understand the unresolved interpretation. Done means the Working Group has agreed how min/max transfers interact with automatic, content-based, minimum, and preferred sizes and the specification reflects that decision.