Redesign landing page from Canva brief

tests/landing-content.test.mjs

@@ -0,0 +1,13 @@
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const componentPath = new URL("../src/components/canva-landing.tsx", import.meta.url);
+
+test("Canva landing component contains the core brief anchors", async () => {
+  const source = await readFile(componentPath, "utf8");
+
+  for (const phrase of ["Projektbrief", "01", "Website", "Kontakt"]) {
+    assert.match(source, new RegExp(phrase));
+  }
+});