Make the first text field in the Material 3 demo readonly to show tha… #95

Job	Run time
check (ubuntu-latest)	3m 33s
dependency-submission (ubuntu-latest)	1m 44s
check (macos-latest)	4m 14s
dependency-submission (macos-latest)	1m 39s
check (windows-latest)	5m 47s
dependency-submission (windows-latest)	2m 31s
	19m 28s

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