fix: render markdown in custom page redirect messages (#25987)

Before:-
<img width="1986" height="762" alt="image (26)" src="https://github.com/user-attachments/assets/90e16a5c-a8f1-4269-8873-8854a82c012e" />
<img width="3456" height="2068" alt="image (27)" src="https://github.com/user-attachments/assets/6714a1d5-454d-4fe7-b6ce-84120353a10a" />
After:-
<img width="977" height="456" alt="Screenshot 2025-12-17 at 9 09 22 PM" src="https://github.com/user-attachments/assets/449611ab-8d84-41e2-a342-0e334562cec5" />

apps/web/app/(use-page-wrapper)/apps/routing-forms/[...pages]/RoutingLink.tsx

@@ -19,6 +19,7 @@ import useGetBrandingColours from "@calcom/lib/getBrandColours";
 import { useCompatSearchParams } from "@calcom/lib/hooks/useCompatSearchParams";
 import { useLocale } from "@calcom/lib/hooks/useLocale";
 import useTheme from "@calcom/lib/hooks/useTheme";
+import { markdownToSafeHTMLClient } from "@calcom/lib/markdownToSafeHTMLClient";
 import { navigateInTopWindow } from "@calcom/lib/navigateInTopWindow";
 import { trpc } from "@calcom/trpc/react";
 import type { inferSSRProps } from "@calcom/types/inferSSRProps";
@@ -208,7 +209,10 @@ function RoutingForm({ form, profile, ...restProps }: Props) {
           <div className="mx-auto my-0 max-w-3xl md:my-24">
             <div className="w-full max-w-4xl ltr:mr-2 rtl:ml-2">
               <div className="main sm:border-subtle bg-default -mx-4 rounded-md border border-neutral-200 p-4 py-6 sm:mx-0 sm:px-8">
-                <div className="text-emphasis">{customPageMessage}</div>
+                <div
+                  className="text-emphasis prose prose-sm dark:prose-invert max-w-none"
+                  dangerouslySetInnerHTML={{ __html: markdownToSafeHTMLClient(customPageMessage) }}
+                />
               </div>
             </div>
           </div>

apps/web/pages/router/index.tsx

@@ -2,6 +2,7 @@
 
 import Head from "next/head";
 
+import { markdownToSafeHTML } from "@calcom/lib/markdownToSafeHTML";
 import type { inferSSRProps } from "@calcom/types/inferSSRProps";
 
 import PageWrapper from "@components/PageWrapper";
@@ -17,7 +18,12 @@ export default function Router({ form, message, errorMessage }: inferSSRProps<ty
       <div className="mx-auto my-0 max-w-3xl md:my-24">
         <div className="w-full max-w-4xl ltr:mr-2 rtl:ml-2">
           <div className="text-default bg-default -mx-4 rounded-sm border border-neutral-200 p-4 py-6 sm:mx-0 sm:px-8">
-            <div>{message || errorMessage}</div>
+            <div
+              className="prose prose-sm dark:prose-invert max-w-none"
+              dangerouslySetInnerHTML={{
+                __html: markdownToSafeHTML(message || errorMessage),
+              }}
+            />
           </div>
         </div>
       </div>