fix: Break words in split panel header #4439

Job	Run time
dry-run / Build collection-hooks	46s
dry-run / Build documenter	1m 54s
dry-run / Build global-styles	25s
dry-run / Build jest-preset	24s
dry-run / Build browser-test-tools	2m 40s
dry-run / Build test-utils	1m 12s
dry-run / Build theming-core	1m 1s
dry-run / Build component-toolkit	1m 10s
dry-run / Build components	6m 7s
dry-run / Components accessibility tests	26m 49s
dry-run / Build board components	4m 25s
dry-run / Components integration tests	19m 49s
dry-run / Components unit tests	9m 9s
dry-run / Demos tests	14m 52s
	1h 30m 43s

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