feat(frontend_editing): display icon_default from Paragraphs in overlay with improved styling

Adjusted rendering logic so that when adding Paragraph entities via the frontend editing overlay, the icon_default from the Paragraphs module is displayed if available. Added CSS classes to enhance the visual appearance of the icon, ensuring a consistent and appealing user interface.

Closes #3508416

css/forms_helper.css

@@ -3,17 +3,17 @@
 }
 
 .path-frontend-editing .layout-node-form__actions {
-  display: block;
   z-index: 2;
+  display: block;
 }
 
 .path-frontend-editing .layout-node-form__actions .gin-sticky {
   position: fixed;
   bottom: 0;
-  background: white;
-  border: 1px solid gray;
   padding: 0 15px;
+  border: 1px solid gray;
   border-radius: 8px;
+  background: white;
 }
 
 body.gin--vertical-toolbar.path-frontend-editing,
@@ -24,23 +24,25 @@ body.path-frontend-editing {
 }
 
 .path-frontend-editing > h1 {
-  align-items: center;
+  position: fixed;
+  z-index: 2;
   display: flex;
-  font-size: 1.125em;
-  font-weight: 500;
-  height: 80px;
+  align-items: center;
   justify-content: center;
-  margin: 0;
-  position: fixed;
   width: 100%;
-  z-index: 2;
+  height: 80px;
+  margin: 0;
+  cursor: pointer;
+  text-decoration: none;
   background-color: #f5f7fb;
+  font-size: 1.125em;
+  font-weight: 500;
 }
 
 .path-frontend-editing .block-system-main-block > form {
-  border-radius: 0;
-  border: 0;
   position: relative;
+  border: 0;
+  border-radius: 0;
 }
 
 .path-frontend-editing .dialog-off-canvas-main-canvas {
@@ -68,3 +70,68 @@ body.frontend-editing-hide-sidebar.gin--horizontal-toolbar,
 body.frontend-editing-hide-sidebar.gin--classic-toolbar {
   padding-inline-start: 0 !important;
 }
+
+.path-frontend-editing .paragraphs-add-dialog-list {
+  padding: 0 20px;
+  column-count: 1;
+  list-style: none;
+}
+
+@media (min-width: 48em) {
+  .path-frontend-editing .paragraphs-add-dialog-list {
+    column-count: 3;
+    column-gap: 14px;
+  }
+}
+
+.path-frontend-editing .paragraphs-add-dialog-row {
+  position: relative;
+}
+
+.path-frontend-editing .paragraphs-add-dialog-row .paragraph-type-icon {
+  position: absolute;
+  top: 10px;
+  left: 10px;
+  display: block;
+  box-sizing: border-box;
+  border: none;
+  box-shadow: none;
+}
+
+.path-frontend-editing .paragraphs-add-dialog-row img {
+  width: 50px;
+  height: 50px;
+  object-fit: contain;
+  border-radius: 5px;
+  background: #fff;
+}
+
+.path-frontend-editing ul.paragraphs-add-dialog-list li {
+  width: 100%;
+  margin: 0 0 10px 0;
+  list-style: none;
+  text-align: left;
+}
+
+.path-frontend-editing ul.paragraphs-add-dialog-list li a {
+  display: block;
+  box-sizing: border-box;
+  width: 100%;
+  min-height: 70px;
+  margin: 0;
+  text-align: left;
+  line-height: 45px;
+}
+
+.path-frontend-editing ul.paragraphs-add-dialog-list li.with-icon a {
+  padding-left: 75px;
+}
+
+.path-frontend-editing .field-add-more-submit:hover a {
+  color: #fff;
+}
+
+.path-frontend-editing ul.paragraphs-add-dialog-list .button.button--small {
+  padding-left: unset;
+  border: unset;
+}