Slightly higher contrast stop button #6026

Job	Run time
build-and-check	3m 8s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 11s
test-integration-packages/agent-runtime	41s
test-integration-web	47s
test-integration-common	44s
test-packages/agent-runtime	43s
test-integration-sdk	1m 26s
test-cli	53s
test-integration-cli	42s
test-.agents	50s
test-common	37s
test-packages/billing	54s
test-packages/internal	1m 0s
test-web	47s
test-sdk	49s
	16m 26s

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