Add a Blog post in-context preview mockup

Modeled on the real supabase.com/blog/[slug] page (BlogPostRenderer.tsx):
sticky nav, back-to-blog link, title, date/read-time, author, then the
hero image — cropped to a fixed 1.91:1 box (object-cover), same as the
live site does regardless of the source image's own aspect ratio, so
this shows exactly how much the Thumb image gets cropped rather than
assuming it survives untouched. Distinct from the existing "Blog
listing" grid mockup, which approximates the index page instead of a
single post.

Wires thumbImgUrl through so the mockup can prefer the Thumb render
(matching the real page's imgThumb-over-imgSocial priority) even when
the OG/Thumb toggle itself isn't currently showing Thumb.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/og-generator/app/InContextPreview.tsx

@@ -12,18 +12,26 @@
  * as authentic, not just "dark card on our UI".
  */
 
-export type InContextMode = 'none' | 'twitter' | 'linkedin' | 'blog'
+export type InContextMode = 'none' | 'twitter' | 'linkedin' | 'blog-post' | 'blog'
 type PreviewTheme = 'light' | 'dark'
 
 export const IN_CONTEXT_OPTS: { value: InContextMode; label: string }[] = [
   { value: 'none', label: 'None' },
   { value: 'twitter', label: 'Twitter / X' },
   { value: 'linkedin', label: 'LinkedIn' },
+  { value: 'blog-post', label: 'Blog post' },
   { value: 'blog', label: 'Blog listing' },
 ]
 
 interface Props {
   imgUrl: string | null
+  /**
+   * The Thumb render, when the active format has one — the real blog post
+   * page's hero crops whichever image it's given to a fixed 1.91:1 box, so
+   * passing this through the Blog-post mockup shows the actual crop instead
+   * of assuming the OG image's own aspect ratio survives untouched.
+   */
+  thumbImgUrl?: string | null
   headline: string
   eyebrow: string | null
   aspect: string
@@ -152,6 +160,60 @@ function LinkedInCardMockup({ imgUrl, headline, aspect }: Props) {
   )
 }
 
+// Real supabase.com/blog/[slug] hero crops whatever image it's given into a
+// fixed 1.91:1 box via object-cover — independent of the source image's own
+// aspect ratio (brief: apps/www/app/blog/[slug]/BlogPostRenderer.tsx).
+const BLOG_POST_HERO_ASPECT = '1.91 / 1'
+
+function BlogPostMockup({ imgUrl, thumbImgUrl, headline }: Props) {
+  const heroSrc = thumbImgUrl ?? imgUrl
+  return (
+    <div className="w-full max-w-[720px] overflow-hidden rounded-lg border border-default bg-background">
+      {/* Sticky site nav — just enough to anchor "above the fold", not a
+          pixel-match of the real header. */}
+      <div className="flex h-16 items-center gap-2 border-b border-default px-6">
+        <div className="h-5 w-5 rounded-[6px]" style={{ backgroundColor: '#3ECF8E' }} />
+        <span className="text-sm font-semibold text-foreground">Supabase</span>
+      </div>
+
+      <div className="flex flex-col gap-4 px-6 pb-8 pt-6">
+        <div className="flex items-center gap-1 text-sm text-foreground-lighter">
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={2}>
+            <path d="M15 18l-6-6 6-6" strokeLinecap="round" strokeLinejoin="round" />
+          </svg>
+          Blog
+        </div>
+
+        <h1 className="text-2xl font-medium leading-tight text-foreground sm:text-4xl">{headline}</h1>
+
+        <div className="flex items-center gap-1 text-sm text-foreground-lighter">
+          <span>Jul 10, 2026</span>
+          <span>·</span>
+          <span>4 minute read</span>
+        </div>
+
+        <div className="flex items-center gap-2">
+          <div className="h-10 w-10 shrink-0 rounded-full bg-surface-300" />
+          <div className="flex flex-col leading-tight">
+            <span className="text-sm text-foreground">Supabase Team</span>
+            <span className="text-xs text-foreground-lighter">Marketing</span>
+          </div>
+        </div>
+
+        {heroSrc && (
+          <div
+            className="w-full overflow-hidden rounded-lg border border-default"
+            style={{ aspectRatio: BLOG_POST_HERO_ASPECT }}
+          >
+            {/* eslint-disable-next-line @next/next/no-img-element */}
+            <img src={heroSrc} alt="" className="h-full w-full object-cover" />
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
+
 function BlogListingMockup({ imgUrl, headline, eyebrow, aspect }: Props) {
   const fillerCards = [
     { eyebrow: 'Engineering', title: 'Scaling Postgres connections with Supavisor' },
@@ -205,6 +267,7 @@ export function InContextPreview({ mode, ...rest }: Props & { mode: InContextMod
   return (
     <div className="flex w-full justify-center rounded-lg bg-surface-100 p-6">
       {mode === 'linkedin' && <LinkedInCardMockup {...rest} />}
+      {mode === 'blog-post' && <BlogPostMockup {...rest} />}
       {mode === 'blog' && <BlogListingMockup {...rest} />}
     </div>
   )

apps/og-generator/app/page.tsx

@@ -649,6 +649,10 @@ export default function Page() {
 
   const showOg = view !== 'thumb'
   const showThumb = view !== 'og' && hasSecondSlot
+  // The Blog-post in-context mockup mirrors the real page's hero, which
+  // prefers the Thumb image — fetch it even if the OG/Thumb toggle itself
+  // isn't showing Thumb right now.
+  const wantsThumbForBlogPost = inContext === 'blog-post' && hasSecondSlot
   // Content controls (Layout/Eyebrow/Headline) stay visible whenever a full
   // composition is on screen — that includes viewing just the second slot
   // when it's a full composition too (e.g. Social's Instagram), unlike the
@@ -696,7 +700,7 @@ export default function Page() {
   }, [brandId, formatId, hasSecondary, headline, eyebrow, template, icon, scale])
 
   const og = useRenderedImage(ogEndpoint, showOg)
-  const thumb = useRenderedImage(thumbEndpoint, showThumb)
+  const thumb = useRenderedImage(thumbEndpoint, showThumb || wantsThumbForBlogPost)
 
   const count = [...headline].length
   const counterColor =
@@ -796,6 +800,7 @@ export default function Page() {
               <InContextPreview
                 mode={inContext}
                 imgUrl={og.url}
+                thumbImgUrl={thumb.url}
                 headline={headline}
                 eyebrow={eyebrow.trim() || null}
                 aspect={`${format.width} / ${format.height}`}