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Opening a compare link while localStorage held a different basket raced a fetch for the OLD school set against the URL's SSR data; the stale response replaced comparisonData, so no active school had data and every section (including the trends chart) vanished until a hard refresh. Responses from superseded effect runs are now dropped, successful ones merge instead of replace, and the URL-seed effect re-runs when a client-side navigation changes ?urns=. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB