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PR #1306 routed artifacts whose source matches htmlNeedsSandboxShim() through buildSrcdoc(), which injects a localStorage / sessionStorage polyfill before any user script runs. Issue #1403 stayed open as a verification placeholder against the original repro shape — a React tree whose useState initializer reads localStorage in a sandboxed iframe. file-viewer-render-mode.test.ts already covers the routing decision. This commit closes the loop on the runtime payload: a real-shape React artifact is fed through buildSrcdoc, the produced doc is run inside a Node vm context whose window forbids Web Storage the same way an allow-scripts iframe does, and we assert (a) the bare sandbox raises SecurityError on access, (b) the shim takes over and exposes a working in-memory store, (c) the original boot script that read localStorage from initializers runs cleanly, and (d) the shim does NOT clobber a working native storage when one is present (the allow-same-origin path stays untouched). Also pins shim ordering — the shim script must appear before the first user storage read for the polyfill to be effective.