feat(wcctools): add context menu and pinning support, persist pinned state in URL, and add grouped demo test elements

test/elements/test-button-danger.ts

@@ -0,0 +1,45 @@
+import {
+  DeesElement,
+  customElement,
+  html,
+  property,
+  css,
+} from '@design.estate/dees-element';
+
+@customElement('test-button-danger')
+export class TestButtonDanger extends DeesElement {
+  // Same group as other buttons
+  public static demoGroup = 'Buttons';
+
+  public static demo = () => html`
+    <test-button-danger>Delete</test-button-danger>
+  `;
+
+  @property({ type: String })
+  accessor label: string = 'Delete';
+
+  public static styles = [
+    css`
+      :host {
+        display: inline-block;
+      }
+      button {
+        background: #ef4444;
+        color: white;
+        border: none;
+        padding: 10px 20px;
+        border-radius: 6px;
+        font-size: 14px;
+        cursor: pointer;
+        transition: background 0.2s;
+      }
+      button:hover {
+        background: #dc2626;
+      }
+    `,
+  ];
+
+  public render() {
+    return html`<button><slot>${this.label}</slot></button>`;
+  }
+}