refactor: extract common components into UI package

packages/lib/client-only/get-bounding-client-rect.ts

@@ -0,0 +1,10 @@
+export const getBoundingClientRect = (element: HTMLElement) => {
+  const rect = element.getBoundingClientRect();
+
+  const { width, height } = rect;
+
+  const top = rect.top + window.scrollY;
+  const left = rect.left + window.scrollX;
+
+  return { top, left, width, height };
+};

packages/lib/constants/pdf-viewer.ts

@@ -0,0 +1,2 @@
+export const PDF_VIEWER_CONTAINER_SELECTOR = '.react-pdf__Document';
+export const PDF_VIEWER_PAGE_SELECTOR = '.react-pdf__Page';