Add direct image download to pdf-to-tiff

src/pages/pdf-to-tiff.html

@@ -155,7 +155,7 @@
         <div id="file-display-area" class="mt-4 space-y-2"></div>
         <div id="options-panel" class="hidden mt-6">
           <button id="process-btn" class="btn-gradient w-full">
-            Download All as ZIP
+            Download All
           </button>
         </div>
       </div>