feat(ui): infinite scroll, saved filters, product timeline, image comparator, customers bulk toolbar, dark mode refinements

pos/templates/customers.html

@@ -306,9 +306,11 @@
 
           <!-- Table -->
           <div class="table-wrap themed-scrollbar">
+            <div id="customersBulkToolbar"></div>
             <table class="customers-table" id="customersTable">
               <thead>
                 <tr>
+                  <th><input type="checkbox" id="selectAllCustomers" onclick="Customers.toggleSelectAll()"></th>
                   <th>#</th>
                   <th>Nombre</th>
                   <th class="hide-mobile">RFC</th>