fix: gộp các nút của thành viên và guest vào một

frontend/src/pages/LandingPage.tsx

@@ -447,6 +447,19 @@ return (
             <option value="system" className="text-black">{t('themeSystem') || 'Hệ thống'}</option>
           </select>
 
+          {/* Android APK Download Button */}
+          <a
+            href={`${import.meta.env.VITE_BACKEND_URL || 'https://yotrip.labz.io.vn'}/downloads/yotrip-latest.apk`}
+            download="yotrip.apk"
+            className="flex items-center justify-center gap-1.5 bg-green-600/80 backdrop-blur-md text-white font-bold py-1.5 px-2.5 sm:py-2 sm:px-4 rounded-full border border-green-500/30 hover:bg-green-500 transition-all shadow-md active:scale-95 text-xs sm:text-sm cursor-pointer shrink-0"
+            title="Tải ứng dụng Android (.APK)"
+          >
+            <svg xmlns="http://www.w3.org/2000/svg" className="w-3.5 h-3.5 sm:w-4 sm:h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
+              <path strokeLinecap="round" strokeLinejoin="round" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v1m-4-4l-4 4m0 0l-4-4m4 4V4" />
+            </svg>
+            <span className="hidden sm:inline">Tải bản Android (.APK)</span>
+          </a>
+
           <button 
             onClick={() => setIsReportModalOpen(true)}
             className="flex items-center justify-center gap-1.5 bg-red-600/80 backdrop-blur-md text-white font-bold py-1.5 px-2.5 sm:py-2 sm:px-3.5 rounded-full border border-red-500/30 hover:bg-red-500 transition-all shadow-md active:scale-95 text-xs sm:text-sm cursor-pointer"