Webapp

feat: Update Mantine #24

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Run time

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Job	Run time
build (18)	1m 58s
test-lib (18, core)	1m 2s
build (20)	1m 43s
test (18)	1m 43s
test-lib (18, api-client)	1m 12s
test (20)	1m 25s
test-lib (18, graphql-api)	1m 30s
test-lib (20, core)	1m 12s
test-lib (20, api-client)	1m 21s
test-lib (20, graphql-api)	1m 4s
	14m 10s