fix(admin): re-assert [hidden] inside the icon modal so tabs and search switch

assets/css/admin-icon-picker.css

@@ -13,6 +13,12 @@
   justify-content: center;
 }
 
+/* Tab/search switching toggles the [hidden] attribute, but the explicit
+   display rules below would beat the UA's [hidden] rule — re-assert it. */
+#aksrt-modal-icon [hidden] {
+  display: none !important;
+}
+
 #aksrt-modal-icon .aksrt-icon-modal__overlay {
   position: absolute;
   inset: 0;

tests/widget-system/icon-picker-contract.test.cjs

@@ -56,6 +56,10 @@ test('picker JS composes the three value formats and loads the REST catalog', ()
   assert.match(js, /DOMParser/, 'custom SVG is sanitized client side');
   const cssPath = 'assets/css/admin-icon-picker.css';
   assert.ok(fs.existsSync(path.join(root, cssPath)), 'picker css shipped');
+  // Tab/search switching toggles the [hidden] attribute; without this guard
+  // the explicit display rules on grids/items override it and every group
+  // stays visible, so the tab bar appears dead.
+  assert.match(css, /#aksrt-modal-icon \[hidden]\s*\{\s*display:\s*none\s*!important/);
 });
 
 test('icon values sanitize through the SVG-aware helper on every save path', () => {