feat(cli): add PageUp/PageDown keyboard shortcuts for scrolling chat history #5365

Job	Run time
build-and-check	2m 43s
test-integration-packages/agent-runtime	41s
test-packages/billing	54s
test-integration-cli	38s
test-sdk	45s
test-common	40s
test-integration-.agents	42s
test-packages/agent-runtime	2m 1s
test-packages/internal	48s
test-integration-common	47s
test-integration-sdk	40s
test-integration-packages/billing	46s
test-integration-packages/internal	42s
test-web	41s
test-.agents	45s
test-cli	1m 18s
test-integration-web	39s
	16m 10s

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