Add native cookie consent and move hero intro above CTA

- Restore CookieConsent banner behavior with the new dependency
- Reposition the right-panel intro above the Projekt anfragen button
- Add focused tests and update build metadata

tests/cookie-banner-info.test.mjs

@@ -0,0 +1,14 @@
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const sourcePath = new URL("../src/lib/cookie-banner-info.ts", import.meta.url);
+
+test("cookie banner uses the native CookieConsent close behavior", async () => {
+  const source = await readFile(sourcePath, "utf8");
+
+  assert.match(source, /from "vanilla-cookieconsent"/);
+  assert.match(source, /acceptNecessaryBtn: "Verstanden"/);
+  assert.doesNotMatch(source, /motion\/mini/);
+  assert.doesNotMatch(source, /cookie-info-fab/);
+});