Remove API route; submit to Brevo directly from client with fetch fallback

[Copilot]

Newsletter subscription was routed through a Next.js API handler (/api/newsletter). The requirement is no API routes — submit directly to Brevo's hosted form endpoint from the client.

Changes

lib/newsletter.ts

• Added shared EMAIL_RE regex and submitToBrevo(email) helper
• POSTs application/x-www-form-urlencoded directly to BREVO_FORM_URL with mode: 'no-cors' (Brevo's endpoint doesn't emit CORS headers; response is opaque so any non-throwing fetch is treated as success)

hooks/use-newsletter-subscribe.ts

• Replaced /api/newsletter fetch with submitToBrevo()
• On failure: opens BREVO_FORM_URL in a new tab so the user is guaranteed to reach the form

components/book-promotion-popup.tsx

• Same direct submitToBrevo() call replacing the previous /api/newsletter fetch
• On failure: same window.open(BREVO_FORM_URL, '_blank') fallback with null-check for popup blockers

app/api/newsletter/route.ts

• Deleted

// On fetch failure — both in hook and popup
} catch {
  const w = window.open(BREVO_FORM_URL, '_blank');
  if (!w) {
    console.warn('[newsletter] Popup blocked. Direct user to:', BREVO_FORM_URL);
  }
  setStatus('error');
}

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