Add GDPR compliant cookie banner and update footer/privacy policy to include GA and Clarity; added e2e and unit tests for cookie handling; updated snapshots

src/lib/components/Footer.svelte

@@ -53,6 +53,13 @@
                 Terms of Service
             </a>
         </nav>
+        <p class="legal-notice">
+            We improve our products and advertising by using Google Analytics and
+            Microsoft Clarity to see how you use our website. By using our site, you agree
+            that we and Microsoft can collect and use this data. Our <a
+                href="/privacy-policy">privacy policy</a
+            > has more details.
+        </p>
     </div>
 </footer>
 
@@ -82,4 +89,22 @@
         justify-content: center;
         gap: var(--space-xs);
     }
+
+    .legal-notice {
+        margin-top: var(--space-md);
+        font-size: var(--font-size-xs);
+        font-weight: var(--font-weight-normal);
+        color: var(--color-text-tertiary);
+        max-width: 100%;
+    }
+
+    .legal-notice a {
+        color: var(--color-primary);
+        text-decoration: underline;
+        text-underline-offset: 0.2em;
+    }
+
+    .legal-notice a:hover {
+        color: var(--color-primary-hover);
+    }
 </style>