The loading spinner in RequireAuth caused a hydration error: on SSR the session was available so children rendered, but during client hydration session.loading was true so the spinner rendered instead, causing DOM mismatch (null nextSibling).
Also includes role resolution priority fixes from previous session:
- prefer preferredRole when backendRole is JOB_SEEKER but preferredRole is not
- pass role via URL param to dashboard
- urlRoleLocked signal prevents auth effects from overriding URL role
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