// serverData returns the per-page data the backend injected for this render, or
// null when there's none.
//
// Three render contexts, one accessor:
//   - ISR server render (goja): the handler sets globalThis.__SERVER_DATA__
//     before rendering, so the page renders with real data.
//   - Browser takeover: the handler inlines the same data as
//     <script>window.__SERVER_DATA__ = {...}</script> before the bundle, so the
//     client re-renders identical markup (no refetch, no flash).
//   - Static skeleton bake (cmd/bundle): nothing is set, so this returns null
//     and the component renders its placeholder/skeleton.
//
// Read it inside the reactive body (not captured at module load) so the value is
// observed at render time in every context.
export function serverData<T>(): T | null {
    return ((globalThis as unknown as { __SERVER_DATA__?: T }).__SERVER_DATA__) ?? null;
}