MAINT: have `qn_domains`-keys in Node/EdgeSettings be typed #585

Job	Run time
pytest / Determine job matrix	7s
style / Determine skipped pre-commit hooks	4s
doc / nb / Execute and build documentation	48s
doc / linkcheck / Check external links	55s
style / Run local pre-commit hooks	45s
pytest / Run unit tests (3.10, ubuntu-24.04)	1m 16s
pytest / Run unit tests (3.11, ubuntu-24.04)	1m 17s
pytest / Run unit tests (3.9, ubuntu-24.04)	1m 24s
pytest / Run unit tests (3.12, ubuntu-24.04, qrules)	2m 45s
pytest / Run unit tests (3.9, macos-14)	49s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	10m 10s

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