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Ring tools in Kekule.js

Benzene and five-membered rings on the editor canvas.

What we checked: Dedicated tools for common ring sizes, including aromatic rings.
Result: Yes, tested by running it: Drew benzene and cyclopentane; other sizes shown. Yes, tested by running it. Drew benzene and cyclopentane; other sizes shown.
Version we tested: 0.9.9.22022400, on macOS 27.0.1 arm64
Manual: github.com