Tighten source filters and add platform toggles

frontend/index.html

@@ -35,6 +35,11 @@
               <h2 class="text-2xl font-semibold text-white">AI Smart Discovery</h2>
             </div>
           </div>
+          <div class="mb-4 flex flex-wrap gap-3">
+            <button data-platform-toggle="envato" class="platform-toggle rounded-full border border-white bg-white px-4 py-2 text-sm font-medium text-black">Envato</button>
+            <button data-platform-toggle="artgrid" class="platform-toggle rounded-full border border-white bg-white px-4 py-2 text-sm font-medium text-black">Artgrid</button>
+            <button data-platform-toggle="google video" class="platform-toggle rounded-full border border-white bg-white px-4 py-2 text-sm font-medium text-black">Google Video</button>
+          </div>
           <form id="searchForm" class="flex flex-col gap-3 md:flex-row">
             <input id="searchQuery" type="text" placeholder="한글 검색어를 입력하세요" class="flex-1 rounded-2xl border border-white/10 bg-black/40 px-5 py-4 text-base text-white outline-none ring-0 placeholder:text-zinc-500" />
             <button class="rounded-2xl border border-white bg-white px-7 py-4 text-base font-medium text-black transition hover:bg-zinc-200">AI Search</button>
@@ -139,6 +144,6 @@
       </a>
     </template>
 
-    <script src="/app.js?v=20260313f" defer></script>
+    <script src="/app.js?v=20260313g" defer></script>
   </body>
 </html>