Move region filters (country/city/district) to second row on desktop

Reduces first row clutter. Added divider between region and toggle buttons.

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

frontend/src/app/page.tsx

@@ -469,6 +469,9 @@ export default function Home() {
                   <option key={g.label} value={g.label}>{g.label}</option>
                 ))}
               </select>
+            </div>
+            {/* Row 2: Region filters + Toggle buttons + count */}
+            <div className="flex items-center gap-3">
               <select
                 value={countryFilter}
                 onChange={(e) => handleCountryChange(e.target.value)}
@@ -503,9 +506,7 @@ export default function Home() {
                   ))}
                 </select>
               )}
-            </div>
-            {/* Row 2: Toggle buttons + count */}
-            <div className="flex items-center gap-3">
+              <div className="w-px h-5 bg-gray-200" />
               <button
                 onClick={() => setBoundsFilterOn(!boundsFilterOn)}
                 className={`px-3 py-1.5 text-sm border rounded-lg transition-colors ${