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AI-generatedGatsby static site and Legacy Node/Express backend: Client‑side hydration isolation
Goal Ensure that the Gatsby‑generated static site can be served alongside the existing Node/Express backend during a zero‑downtime cut‑over without client‑side hydration causing style leaks or script conflicts from shared global CSS or JavaScript variables. Constraints: the legacy app continues to load its own global stylesheet and runtime scripts on the sam