add 403 and 500 pages in App Router

apps/web/app/403/page.tsx

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+import { _generateMetadata, getTranslate } from "app/_utils";
+import { WithLayout } from "app/layoutHOC";
+
+import { APP_NAME, WEBAPP_URL } from "@calcom/lib/constants";
+import { Button } from "@calcom/ui";
+
+export const generateMetadata = () =>
+  _generateMetadata(
+    (t) => `${t("access_denied")} | ${APP_NAME}`,
+    () => ""
+  );
+
+async function Error403() {
+  const t = await getTranslate();
+
+  return (
+    <div className="bg-subtle flex h-screen">
+      <div className="rtl: bg-default m-auto rounded-md p-10 text-right ltr:text-left">
+        <h1 className="font-cal text-emphasis text-6xl">403</h1>
+        <h2 className="text-emphasis mt-6 text-2xl font-medium">{t("dont_have_access_this_page")}</h2>
+        <p className="text-default mb-6 mt-4 max-w-2xl text-sm">
+          {t("you_need_admin_or_owner_privileges_to_access")}
+        </p>
+        <Button href={WEBAPP_URL}>{t("go_back_home")}</Button>
+      </div>
+    </div>
+  );
+}
+
+export default WithLayout({ ServerPage: Error403 });

apps/web/app/500/copy-button.tsx

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+"use client";
+
+import { useLocale } from "@calcom/lib/hooks/useLocale";
+import { Button, showToast } from "@calcom/ui";
+
+export default function CopyButton({ error }: { error: string }) {
+  const { t } = useLocale();
+
+  return (
+    <Button
+      color="secondary"
+      className="mt-2 border-0 font-sans font-normal hover:bg-gray-300"
+      StartIcon="copy"
+      onClick={() => {
+        navigator.clipboard.writeText(error);
+        showToast("Link copied!", "success");
+      }}>
+      {t("copy")}
+    </Button>
+  );
+}

apps/web/app/500/page.tsx

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+import { _generateMetadata, getTranslate } from "app/_utils";
+import { WithLayout } from "app/layoutHOC";
+
+import { APP_NAME } from "@calcom/lib/constants";
+import { Button } from "@calcom/ui";
+
+import CopyButton from "./copy-button";
+
+export const generateMetadata = () =>
+  _generateMetadata(
+    (t) => `${t("something_unexpected_occurred")} | ${APP_NAME}`,
+    () => ""
+  );
+
+async function Error500({ searchParams }: { searchParams: { error?: string } }) {
+  const t = await getTranslate();
+
+  return (
+    <div className="bg-subtle flex h-screen">
+      <div className="rtl: bg-default m-auto rounded-md p-10 text-right ltr:text-left">
+        <h1 className="font-cal text-emphasis text-6xl">500</h1>
+        <h2 className="text-emphasis mt-6 text-2xl font-medium">{t("500_error_message")}</h2>
+        <p className="text-default mb-6 mt-4 max-w-2xl text-sm">{t("something_went_wrong_on_our_end")}</p>
+        {searchParams?.error && (
+          <div className="mb-8 flex flex-col">
+            <p className="text-default mb-4 max-w-2xl text-sm">
+              {t("please_provide_following_text_to_suppport")}:
+            </p>
+            <pre className="bg-emphasis text-emphasis w-full max-w-2xl whitespace-normal break-words rounded-md p-4">
+              {searchParams.error}
+              <br />
+              <CopyButton error={searchParams.error} />
+            </pre>
+          </div>
+        )}
+        <Button href="mailto:[email protected]">{t("contact_support")}</Button>
+        <Button color="secondary" href="javascript:history.back()" className="ml-2">
+          {t("go_back")}
+        </Button>
+      </div>
+    </div>
+  );
+}
+
+export default WithLayout({
+  ServerPage: Error500,
+});