Convert app.tsx route tree verbatim to a module-level data router via
createRoutesFromElements + RouterProvider, and the test harness to
createMemoryRouter + RouterProvider. The search NavLink-click test now mounts
its routes as real data-router routes so RouterProvider intercepts the link
(descendant <Routes> under a catch-all let it fall through to a jsdom navigation).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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