#572 introduced a hard dependency on anywidget but that dependency is only declared in the `test` extra, not the actual package deps. This is failing the current scippneutron nightly build: https://productionresultssa10.blob.core.windows.net/actions-results/5d3f434f-f6ff-4a0b-8bc7-e80b2d3d764d/workflow-job-run-e1e18358-67b9-5a6c-83cb-542a5511f3ae/logs/job/job-logs.txt?rsct=text%2Fplain&se=2026-06-22T07%3A22%3A22Z&sig=uAqTFUkWvE%2Fhwr2OkcKisS9NWfD9fnGFhuqKfbkygrE%3D&ske=2026-06-22T08%3A31%3A40Z&skoid=ca7593d4-ee42-46cd-af88-8b886a2f84eb&sks=b&skt=2026-06-22T04%3A31%3A40Z&sktid=398a6654-997b-47e9-b12b-9515b896b4de&skv=2025-11-05&sp=r&spr=https&sr=b&st=2026-06-22T07%3A12%3A17Z&sv=2025-11-05
#572 introduced a hard dependency on anywidget but that dependency is only declared in the
testextra, not the actual package deps. This is failing the current scippneutron nightly build: https://productionresultssa10.blob.core.windows.net/actions-results/5d3f434f-f6ff-4a0b-8bc7-e80b2d3d764d/workflow-job-run-e1e18358-67b9-5a6c-83cb-542a5511f3ae/logs/job/job-logs.txt?rsct=text%2Fplain&se=2026-06-22T07%3A22%3A22Z&sig=uAqTFUkWvE%2Fhwr2OkcKisS9NWfD9fnGFhuqKfbkygrE%3D&ske=2026-06-22T08%3A31%3A40Z&skoid=ca7593d4-ee42-46cd-af88-8b886a2f84eb&sks=b&skt=2026-06-22T04%3A31%3A40Z&sktid=398a6654-997b-47e9-b12b-9515b896b4de&skv=2025-11-05&sp=r&spr=https&sr=b&st=2026-06-22T07%3A12%3A17Z&sv=2025-11-05