feat: improve custom rotate UX with larger previews and float precision

src/pages/rotate-custom.html

@@ -177,6 +177,7 @@
                   id="batch-custom-angle"
                   type="number"
                   value="0"
+                  step="0.1"
                   class="w-20 h-10 text-center bg-gray-700 border border-gray-600 text-white rounded-lg"
                 />
                 <button
@@ -198,7 +199,7 @@
           <!-- Page Thumbnails -->
           <div
             id="page-thumbnails"
-            class="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 gap-4 mb-4"
+            class="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-2 lg:grid-cols-3 gap-6 mb-4"
           ></div>
 
           <button id="process-btn" class="btn-gradient w-full mt-4">