Add RTL support for search button rounded corners

Mirror rounded corners on search button when Arabic (RTL) is selected.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/index.html

@@ -101,7 +101,7 @@
                 </div>
 
                 <!-- Search Button -->
-                <button id="search-btn" class="gold-fade hover:brightness-110 px-8 py-3 md:py-0 text-emerald-950 rounded-b-xl md:rounded-b-none md:rounded-r-2xl flex items-center justify-center transition">
+                <button id="search-btn" class="gold-fade hover:brightness-110 px-8 py-3 md:py-0 text-emerald-950 rounded-b-xl md:rounded-b-none md:rounded-r-2xl rtl:md:rounded-r-none rtl:md:rounded-l-2xl flex items-center justify-center transition">
                     <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"/>
                     </svg>