chore(www): add State of Startups 2026 OG image (supabase#46394)

## 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?

Chore — adds a static asset.

## What is the current behavior?

The State of Startups 2026 page references
`/images/state-of-startups/2026/state-of-startups-og.png` for its Open
Graph image, but the file did not exist in the repo.

## What is the new behavior?

Adds the OG image at the expected path so social previews render
correctly when sharing `/state-of-startups`.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Style**
* Adjusted the minimum height of the State of Startups header and its
inner wrapper on non-medium breakpoints to refine spacing and visual
balance.
* Medium-breakpoint height remains unchanged, preserving the intended
layout at that size.

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Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/46394?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)

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Author: stylessh

apps/www/app/state-of-startups/components/StateOfStartupsAuroraHeader.tsx

@@ -11,7 +11,7 @@ export function StateOfStartupsAuroraHeader() {
 
   return (
     <header
-      className="relative w-full overflow-hidden min-h-[32svh] md:min-h-[50svh]"
+      className="relative w-full overflow-hidden min-h-[26rem] md:min-h-[50vh]"
       style={{ background: 'hsl(var(--background-alternative-default))' }}
     >
       {/* Aurora shader scene — hidden when user prefers reduced motion */}
@@ -49,7 +49,7 @@ export function StateOfStartupsAuroraHeader() {
       />
 
       {/* Content — constrained to default container */}
-      <div className="relative z-10 max-w-240 mx-auto px-8 flex flex-col gap-4 justify-end pb-16 md:pb-18 min-h-[32svh] md:min-h-[50svh]">
+      <div className="relative z-10 max-w-240 mx-auto px-8 flex flex-col gap-4 justify-end pb-16 md:pb-18 min-h-[26rem] md:min-h-[50vh]">
         <p className="font-mono uppercase tracking-wide text-sm text-foreground-light">
           Supabase Presents
         </p>