fix(web): remove turbostarter CTA popup + ship claudemesh OG image

Two visible launch-polish issues:

1. BuyCtaDialog popup was firing on an exponential backoff schedule
   (15s, 30s, 60s, …) pushing users toward turbostarter.dev/#pricing +
   Discord. Wrong product, wrong audience. Fully removed: mount point
   in [locale]/layout.tsx + the component file + localStorage keys will
   self-prune on next visit.

2. WhatsApp/Slack/Twitter link previews were pulling the TurboStarter
   boilerplate opengraph-image.png (from Jan 8). Replaced with a 1200×630
   claudemesh OG: "CLAUDEMESH" pixel wordmark left side, hero mesh
   composition (6 Claude Code terminals + pixel-crab hub + orange
   energy lattice + vaporwave grid floor) right side, "peer mesh for
   Claude Code sessions" tagline in mono beneath wordmark.

3. Default metadata description swapped from the dangling
   `common:product.description` i18n key (which rendered as the key
   itself because the key doesn't exist in our trimmed translations)
   to a hardcoded claudemesh description.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/app/[locale]/layout.tsx

@@ -7,7 +7,6 @@ import { Providers } from "~/lib/providers/providers";
 import { ImpersonatingBanner } from "~/modules/admin/users/user/impersonating-banner";
 import { BaseLayout } from "~/modules/common/layout/base";
 import { Toaster } from "~/modules/common/toast";
-import { BuyCtaDialog } from "~/modules/marketing/layout/buy-cta-dialog";
 
 export function generateStaticParams() {
   return config.locales.map((locale) => ({ locale }));
@@ -33,7 +32,6 @@ export default async function RootLayout({
       <Providers locale={locale}>
         <ImpersonatingBanner />
         {children}
-        <BuyCtaDialog />
         <Toaster />
       </Providers>
     </BaseLayout>