Fix lint errors in web: empty blocks, conditional hooks, const condit… #5081

Job	Run time
build-and-check	2m 7s
test-integration-.agents	1m 18s
test-integration-npm-app	38s
test-integration-backend	41s
test-integration-sdk	1m 2s
test-integration-web	43s
test-common	46s
test-integration-packages/billing	36s
test-integration-packages/internal	52s
test-npm-app	48s
test-web	46s
test-integration-packages/agent-runtime	38s
test-sdk	48s
test-integration-common	45s
test-cli	1m 11s
test-packages/billing	40s
test-backend	41s
test-.agents	40s
test-packages/internal	40s
test-packages/agent-runtime	57s
test-integration-cli	41s
	17m 58s

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