feat: FraseAncla section (02) — anchor quote

vitest.setup.ts

@@ -1 +1,19 @@
 import '@testing-library/jest-dom/vitest';
+
+// jsdom lacks IntersectionObserver; Framer Motion's `whileInView` needs it.
+if (typeof window !== 'undefined' && !('IntersectionObserver' in window)) {
+  class IntersectionObserverStub {
+    observe() {}
+    unobserve() {}
+    disconnect() {}
+    takeRecords() {
+      return [];
+    }
+    root = null;
+    rootMargin = '';
+    thresholds = [];
+  }
+  // @ts-expect-error – installing stub on window
+  window.IntersectionObserver = IntersectionObserverStub;
+  global.IntersectionObserver = IntersectionObserverStub;
+}