ver. 0.301: Collapsible table filters and mobile-responsive order details

- Table filters hidden by default with toggle button (icon + active count badge)
- Filter state persisted in localStorage; auto-show when filters active
- Order details mobile layout: icon-only action bar, full-width stacking,
  compact product list (image + name + qty x price = total), bottom-sheet
  dropdown for integrations menu

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin/layout/style-css/table-list.css

@@ -57,6 +57,36 @@
   width: 100% !important;
 }
 
+/* --- Filter toggle --- */
+
+.table-filters-wrapper {
+  display: none;
+  overflow: hidden;
+}
+
+.table-filters-wrapper.open {
+  display: block;
+}
+
+.js-filter-toggle-btn.active {
+  background-color: #e8e8e8;
+  border-color: #adadad;
+  box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
+}
+
+.table-filter-badge {
+  display: inline-block;
+  min-width: 16px;
+  padding: 2px 5px;
+  font-size: 10px;
+  font-weight: 700;
+  line-height: 1;
+  color: #fff;
+  background-color: #337ab7;
+  border-radius: 10px;
+  margin-left: 3px;
+}
+
 /* --- Column visibility toggle --- */
 
 .table-list-header-actions {