feat: add sidebar

web/src/contexts/usePageHeader.ts

@@ -0,0 +1,10 @@
+import { useContext } from "react";
+import { PageHeaderContext, type PageHeaderContextValue } from "./page-header-context";
+
+export function usePageHeader(): PageHeaderContextValue {
+  const ctx = useContext(PageHeaderContext);
+  if (!ctx) {
+    throw new Error("usePageHeader must be used within a PageHeaderProvider");
+  }
+  return ctx;
+}