feat: enhance sanitization

src/pages/pdf-multi-tool.html

@@ -375,7 +375,6 @@
         <div
           id="upload-area"
           class="hidden border-2 border-dashed border-gray-600 rounded-lg p-6 sm:p-12 text-center max-w-full cursor-pointer"
-          onclick="document.getElementById('pdf-file-input').click()"
         >
           <i
             data-lucide="upload-cloud"
@@ -401,10 +400,7 @@
             class="hidden"
           />
           <button
-            onclick="
-              event.stopPropagation();
-              document.getElementById('pdf-file-input').click();
-            "
+            id="pdf-file-input-select-btn"
             class="bg-indigo-600 hover:bg-indigo-700 text-white px-4 sm:px-6 py-2 rounded text-sm sm:text-base"
             data-i18n="multiTool.selectFiles"
           >