fix: replace invalid TanStack Router search casts with typed defaults

Newer TanStack Router enforces strict types on search params — 'search: {} as Record<string, unknown>' no longer satisfies routes with validateSearch. Replace all occurrences with the correct search shape for each destination route (pagination defaults for list routes, tab/field defaults for detail routes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/admin/src/routes/_authenticated.tsx

@@ -67,7 +67,7 @@ function NavLink({ to, icon, label, collapsed }: { to: string; icon: React.React
   return (
     <Link
       to={to as '/accounts'}
-      search={{} as Record<string, unknown>}
+      search={{ page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const }}
       className="flex items-center gap-2 px-3 py-2 rounded-md text-sm text-sidebar-foreground hover:bg-sidebar-accent"
       activeProps={{ className: 'flex items-center gap-2 px-3 py-2 rounded-md text-sm bg-sidebar-accent text-sidebar-accent-foreground' }}
       title={collapsed ? label : undefined}