[render preview] web: reintroduce server aggregator for agents + fix store empty-state #4319

Job	Run time
build-and-check	3m 11s
test-backend	54s
test-.agents	57s
test-npm-app	1m 1s
test-cli	1m 13s
test-packages/billing	1m 2s
test-web	1m 4s
test-integration-.agents	1m 1s
test-packages/agent-runtime	1m 5s
test-packages/internal	56s
test-integration-backend	55s
test-common	54s
test-integration-npm-app	1m 0s
test-integration-packages/billing	59s
test-integration-common	1m 0s
test-integration-packages/agent-runtime	1m 4s
test-integration-cli	59s
test-integration-packages/internal	58s
test-integration-web	56s
	21m 9s

Provide feedback