refactor(dashboard): immutable state updates, drag-drop hook, and gra… #975

Job	Run time
release-please	29s
build-deploy-diracx-web-dev-image	2m 3s
build-storybook-docs	1m 23s
build-deploy-diracx-web-release-image	27s
build-deploy-library-package	0s
Update Helm charts	0s
deploy-storybook-docs	0s
	4m 22s

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