v0.9.52: Next.js 16.4.5 security release, route-handler framing alignment, egress gateway addresses kept out of the Trigger env sync, docs code rendering and keyboard navigation, dependency updates

v0.9.52: Next.js 16.4.5 security release, route-handler framing alignment, egress gateway addresses kept out of the Trigger env sync, docs code rendering and keyboard navigation, dependency updates #4026