Make the model selection screen work well on smaller-height terminals #6646

Job	Run time
build-and-check	3m 10s
test-integration-packages/billing	1m 0s
test-integration-packages/agent-runtime	39s
test-integration-packages/internal	1m 1s
test-integration-cli	42s
test-integration-sdk	1m 18s
test-integration-common	38s
test-common	48s
test-integration-web	44s
test-packages/billing	54s
test-packages/agent-runtime	40s
test-packages/internal	49s
test-web	52s
test-sdk	40s
test-.agents	54s
test-cli	1m 0s
	15m 49s

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