Add harness workflow and Material showcase design system

packages/ui/src/lib/skin.test.ts

@@ -9,16 +9,16 @@ describe("skin contract", () => {
   });
 
   it("sets the document root skin when no target element is provided", () => {
-    setSkin("glass");
+    setSkin("material");
 
-    expect(document.documentElement.dataset.skin).toBe("glass");
+    expect(document.documentElement.dataset.skin).toBe("material");
   });
 
   it("sets the provided target element instead of the document root", () => {
     const target = document.createElement("div");
 
-    setSkin("pixel", target);
+    setSkin("material", target);
 
-    expect(target.dataset.skin).toBe("pixel");
+    expect(target.dataset.skin).toBe("material");
   });
 });