Syndynes plots and fixes #537

Job	Run time
tests / Load tox environments	8s
Python 3.14 with all optional dependencies (MacOS)	2m 23s
tests / Python 3.14 with all optional dependencies, measuring coverage	1m 44s
tests / Code style checks	23s
tests / Python 3.14 with minimal dependencies, measuring coverage	49s
tests / Python 3.10 with oldest supported versions, measuring coverage	2m 19s
	7m 46s

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