feat(19-01): wire LeadsViewToggle into leads page + build verified

- page.tsx: import LeadsViewToggle from @/components/admin/leads/LeadsViewToggle
- page.tsx: render <LeadsViewToggle leads={leads} options={options} />
- Removed direct LeadsSearch import from page (re-exported via LeadsSearch.tsx)
- Build: Next.js 16.2.6 Turbopack — Compiled successfully, TypeScript clean

src/app/admin/leads/page.tsx

@@ -1,5 +1,5 @@
 import { getLeadsWithTags, getLeadFieldOptions } from "@/lib/admin-queries";
-import { LeadsSearch } from "./LeadsSearch";
+import { LeadsViewToggle } from "@/components/admin/leads/LeadsViewToggle";
 import { CreateLeadModal } from "@/components/admin/leads/LeadForm";
 
 export const revalidate = 0;
@@ -17,7 +17,7 @@ export default async function LeadsPage() {
         <CreateLeadModal />
       </div>
 
-      <LeadsSearch leads={leads} options={options} />
+      <LeadsViewToggle leads={leads} options={options} />
     </div>
   );
 }