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

pnpm-lock.yaml

@@ -62,6 +62,9 @@ importers:
       tw-animate-css:
         specifier: ^1.4.0
         version: 1.4.0
+      vanilla-cookieconsent:
+        specifier: ^3.1.0
+        version: 3.1.0
       zod:
         specifier: ^4.3.6
         version: 4.3.6
@@ -3709,6 +3712,9 @@ packages:
     resolution: {integrity: sha512-hVDIBwsRruT73PbK7uP5ebUt+ezEtCmzZz3F59BSr2F6OVFnJ/6h8liuvdLrQ88Xmnk6/+xGGuq+pG9WwTuy3A==}
     engines: {node: ^20.17.0 || >=22.9.0}
 
+  vanilla-cookieconsent@3.1.0:
+    resolution: {integrity: sha512-/McNRtm/3IXzb9dhqMIcbquoU45SzbN2VB+To4jxEPqMmp7uVniP6BhGLjU8MC7ZCDsNQVOp27fhQTM/ruIXAA==}
+
   vary@1.1.2:
     resolution: {integrity: sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==}
     engines: {node: '>= 0.8'}
@@ -7794,6 +7800,8 @@ snapshots:
 
   validate-npm-package-name@7.0.2: {}
 
+  vanilla-cookieconsent@3.1.0: {}
+
   vary@1.1.2: {}
 
   vfile-location@5.0.3: