Updated webinar pages with YouTube recording links (#44003)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Updated webinar landing pages with recording of the event on YouTube

apps/www/_events/2026-03-19-agency-webinar-ai-prototyping-production.mdx

@@ -13,11 +13,9 @@ duration: 45 mins
 categories:
   - webinar
 main_cta:
-  {
-    url: 'https://attendee.gotowebinar.com/register/5606981989518150747',
-    target: '_blank',
-    label: 'Register now',
-  }
+  url: '#recording'
+  target: _self
+  label: Watch the recording
 speakers: 'seth_kramer,dave_wilson,zimo_holdijk,harry_roper,victor_orozco'
 ---
 
@@ -25,6 +23,16 @@ AI coding tools have made prototyping almost instant. Agencies now send working
 
 Join agency leaders and Supabase as they share how top agencies balance velocity with control. Learn when to let AI move fast, and where experienced developers still need to step in.
 
+<div className="video-container mb-8" id="recording">
+  <iframe
+    className="w-full"
+    src="https://www.youtube-nocookie.com/embed/D_Qhiyyp6_M"
+    title="Ship Fast, Stay Safe: AI Prototyping That Survives Production"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; fullscreen; gyroscope; picture-in-picture; web-share"
+    allowFullScreen
+  />
+</div>
+
 ## Key takeaways
 
 - Why leading agencies design database schemas and RLS policies before touching the UI
@@ -37,4 +45,4 @@ Join agency leaders and Supabase as they share how top agencies balance velocity
 
 - How to hand projects off to clients without handing over production risk
 
-Join us live to participate in the Q&A. Can't make it? We'll send you a link to the recording.
+We hope you enjoy the recording!

apps/www/_go/webinar/agency-webinar-mar2026.tsx

@@ -40,8 +40,7 @@ const page: GoPageInput = {
       title: 'Watch the recording',
       description:
         'Join agency leaders and Supabase as they share how top agencies balance velocity with control when using AI coding tools to build production applications.',
-      // TODO: Add YouTube URL when recording is available
-      children: <MediaBlock />,
+      children: <MediaBlock youtubeUrl="https://www.youtube.com/watch?v=D_Qhiyyp6_M" />,
     },
     {
       type: 'feature-grid',