Bulk update category order and improve number formatting

Category order is now updated via a bulk API endpoint instead of individual requests, improving efficiency. Number formatting in pricing tiers form now avoids cursor jumping by only formatting decimals when necessary.

app/dashboard/categories/page.tsx

@@ -180,10 +180,15 @@ export default function CategoriesPage() {
       return updatedCat || cat;
     }));
     
-    // Save the new order to the server
+    // Save the new order to the server using bulk update
     try {
-      await apiRequest(`/categories/${dragId}`, "PUT", {
-        order: filteredSiblings.find(cat => cat._id === dragId)?.order,
+      const categoriesToUpdate = filteredSiblings.map(cat => ({
+        _id: cat._id,
+        order: cat.order
+      }));
+      
+      await apiRequest("/categories/bulk-order", "PUT", {
+        categories: categoriesToUpdate
       });
     } catch (error) {
       toast.error("Failed to update category order");