Export cells to brainrender from brainmapper widget #381

Job	Run time
Check Linting	13s
Check Manifest	23s
Run tests with numba disabled	12m 21s
ubuntu-latest py3.10	9m 48s
ubuntu-latest py3.11	15m 36s
ubuntu-latest py3.12	11m 6s
macos-13 py3.12	18m 45s
macos-latest py3.12	22m 15s
windows-latest py3.12	14m 41s
Build source distribution	0s
Publish build distributions	0s
	1h 45m 8s

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