Thinking block UX/refactor: show 5 line preview until next message #5646

Job	Run time
build-and-check	2m 49s
test-integration-packages/billing	1m 8s
test-integration-common	42s
test-integration-packages/internal	59s
test-integration-sdk	48s
test-packages/internal	48s
test-integration-packages/agent-runtime	42s
test-.agents	43s
test-packages/agent-runtime	44s
test-common	46s
test-web	48s
test-integration-cli	48s
test-cli	56s
test-integration-web	46s
test-packages/billing	40s
test-sdk	45s
	14m 52s

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