Add layout 3 list card scaffold with small sandwich menu

patterns/vsf-list-card.html

@@ -146,6 +146,30 @@
         </div>
       </article>
     </div>
+
+    <h2 class="sg-sub-heading sg-section-h2">Layout 3: List Card</h2>
+    <div class="sg-object-card-grid" aria-label="VSF List Card Layout List Card">
+      <article class="sg-card sg-object-card" data-pattern="object-group-card" aria-label="List Card">
+        <header class="sg-card-segment sg-card-segment--header sg-card-segment--darkblue sg-object-card__header" data-pattern-part="object-group-card-header">
+          <div class="sg-strong">Neue Liste anlegen</div>
+          <div class="sg-sandwich-menu-wrap" data-open="false" data-align="right" data-component="sandwich-menu" data-component-size="small">
+            <button class="sg-interaction-element sg-sandwich-button sg-sandwich-button--small" type="button" aria-expanded="false" aria-label="Menü öffnen" data-component-part="sandwich-trigger">
+              <span class="sg-sandwich-button__icon" aria-hidden="true">
+                <span class="sg-sandwich-button__line"></span>
+                <span class="sg-sandwich-button__line"></span>
+                <span class="sg-sandwich-button__line"></span>
+              </span>
+            </button>
+            <div class="sg-sandwich-menu-panel" aria-label="Ausgeklapptes Menü" data-component-part="sandwich-panel">
+              <a class="sg-sandwich-menu-link" href="#">Menüpunkt</a>
+              <a class="sg-sandwich-menu-link" href="#">Menüpunkt</a>
+              <a class="sg-sandwich-menu-link" href="#">Menüpunkt</a>
+            </div>
+          </div>
+        </header>
+        <div class="sg-card-segment sg-card-segment--gray sg-object-card__content" data-pattern-part="object-group-card-content"></div>
+      </article>
+    </div>
   </section>
 
   <script>
@@ -239,8 +263,43 @@
     });
     updateProcessButtonState();
 
+    document.querySelectorAll('.sg-sandwich-menu-wrap').forEach((wrap) => {
+      const button = wrap.querySelector('.sg-sandwich-button');
+      const panel = wrap.querySelector('.sg-sandwich-menu-panel');
+
+      if (!button) {
+        return;
+      }
+
+      button.addEventListener('click', (event) => {
+        event.stopPropagation();
+        const nextState = wrap.dataset.open !== 'true';
+
+        document.querySelectorAll('.sg-sandwich-menu-wrap').forEach((otherWrap) => {
+          const otherButton = otherWrap.querySelector('.sg-sandwich-button');
+          otherWrap.dataset.open = 'false';
+          if (otherButton) {
+            otherButton.setAttribute('aria-expanded', 'false');
+          }
+        });
+
+        wrap.dataset.open = String(nextState);
+        button.setAttribute('aria-expanded', String(nextState));
+
+        if (!nextState || !panel) {
+          return;
+        }
+
+        wrap.dataset.align = 'right';
+        const panelRect = panel.getBoundingClientRect();
+        if (panelRect.left < 0) {
+          wrap.dataset.align = 'left';
+        }
+      });
+    });
+
     document.addEventListener('click', (event) => {
-      if (event.target.closest('.sg-pulldown-demo')) {
+      if (event.target.closest('.sg-pulldown-demo') || event.target.closest('.sg-sandwich-menu-wrap')) {
         return;
       }
 
@@ -251,6 +310,14 @@
           trigger.setAttribute('aria-expanded', 'false');
         }
       });
+
+      document.querySelectorAll('.sg-sandwich-menu-wrap').forEach((wrap) => {
+        const button = wrap.querySelector('.sg-sandwich-button');
+        wrap.dataset.open = 'false';
+        if (button) {
+          button.setAttribute('aria-expanded', 'false');
+        }
+      });
     });
   </script>