feat(finalization): winner email + UI for terminal rounds

When finalizing a round with no further round to advance to, passing teams
are winners — not advancers. Detected for both special-award terminal rounds
(label = award name) and the main competition's terminal round (label =
competition name). Wording uses "a winner" so it works for both single-winner
awards and top-N main-track outcomes.

Adds AWARD_WINNER_NOTIFICATION email type + template ("Your project has won!"
with "our team will reach out about next steps" copy). Routes through the
notification dispatch table the same way ADVANCEMENT_NOTIFICATION does.

The FinalizationSummary gains a `winnerContext` field; the admin finalization
tab uses it to swap "X projects will advance to Y" → "X winners will be
notified for [label]" and renames "Advancement Message" → "Winner Message"
in the custom-message field. The email-preview button shows the winner
template when applicable.

In-app notification (bell icon) gets matching winner copy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/email.ts

@@ -1992,6 +1992,84 @@ Together for a healthier ocean.
   }
 }
 
+/**
+ * Generate "Award Winner" notification email template — used when finalizing
+ * the terminal round of a special award (no further rounds to advance to).
+ */
+export function getAwardWinnerNotificationTemplate(
+  name: string,
+  projectName: string,
+  winnerLabel: string,
+  customMessage?: string,
+  accountUrl?: string,
+  fullCustomBody?: boolean,
+): EmailTemplate {
+  const greeting = name ? `Congratulations ${name}!` : 'Congratulations!'
+
+  const escapedMessage = customMessage
+    ? escapeHtml(customMessage).replace(/\n/g, '<br>')
+    : null
+
+  if (fullCustomBody && escapedMessage) {
+    const content = `
+      ${sectionTitle(greeting)}
+      <div style="color: ${BRAND.textDark}; font-size: 15px; line-height: 1.7; margin: 20px 0;">${escapedMessage}</div>
+      ${accountUrl ? ctaButton(accountUrl, 'Create Your Account') : ctaButton('/applicant', 'View Your Dashboard')}
+    `
+    return {
+      subject: `Your project has won: "${projectName}"`,
+      html: getEmailWrapper(content),
+      text: `${greeting}\n\n${customMessage}\n\n${accountUrl ? `Create your account: ${getBaseUrl()}${accountUrl}` : `Visit your dashboard: ${getBaseUrl()}/applicant`}\n\n---\nMonaco Ocean Protection Challenge\nTogether for a healthier ocean.`,
+    }
+  }
+
+  const winnerBanner = `
+<table role="presentation" width="100%" cellspacing="0" cellpadding="0" border="0" style="margin: 20px 0;">
+  <tr>
+    <td style="background: linear-gradient(135deg, #b45309 0%, #f59e0b 100%); border-radius: 12px; padding: 28px; text-align: center;">
+      <p style="color: #ffffff; margin: 0 0 8px 0; font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 2px;">Winner Announcement</p>
+      <h2 style="color: #ffffff; margin: 0; font-size: 28px; font-weight: 700;">Your project has won!</h2>
+    </td>
+  </tr>
+</table>
+`
+
+  const content = `
+    ${sectionTitle(greeting)}
+    ${winnerBanner}
+    ${infoBox(`<strong>"${escapeHtml(projectName)}"</strong> has been selected as a winner of <strong>${escapeHtml(winnerLabel)}</strong>.`, 'success')}
+    ${
+      escapedMessage
+        ? `<div style="background-color: #f5f5f5; border-radius: 8px; padding: 20px; margin: 20px 0; color: ${BRAND.textDark}; font-size: 15px; line-height: 1.7;">${escapedMessage}</div>`
+        : paragraph('Our team will reach out shortly with details on the next steps, including award presentation, communications, and any administrative requirements.')
+    }
+    ${accountUrl ? ctaButton(accountUrl, 'Create Your Account') : ctaButton('/applicant', 'View Your Dashboard')}
+  `
+
+  return {
+    subject: `Your project has won: "${projectName}"`,
+    html: getEmailWrapper(content),
+    text: `
+${greeting}
+
+Your project has won!
+
+Project: ${projectName}
+${winnerLabel}
+
+"${projectName}" has been selected as a winner of ${winnerLabel}.
+
+${customMessage || 'Our team will reach out shortly with details on the next steps, including award presentation, communications, and any administrative requirements.'}
+
+${accountUrl ? `Create your account: ${getBaseUrl()}${accountUrl}` : `Visit your dashboard: ${getBaseUrl()}/applicant`}
+
+---
+Monaco Ocean Protection Challenge
+Together for a healthier ocean.
+    `,
+  }
+}
+
 /**
  * Generate "Under Consideration for Special Award" notification email template
  */
@@ -2273,6 +2351,16 @@ export const NOTIFICATION_EMAIL_TEMPLATES: Record<string, TemplateGenerator> = {
       ctx.metadata?.fullCustomBody as boolean | undefined,
     ),
 
+  AWARD_WINNER_NOTIFICATION: (ctx) =>
+    getAwardWinnerNotificationTemplate(
+      ctx.name || '',
+      (ctx.metadata?.projectName as string) || 'Your Project',
+      (ctx.metadata?.awardName as string) || 'Special Award',
+      ctx.metadata?.customMessage as string | undefined,
+      ctx.metadata?.accountUrl as string | undefined,
+      ctx.metadata?.fullCustomBody as boolean | undefined,
+    ),
+
   AWARD_SELECTION_NOTIFICATION: (ctx) =>
     getAwardSelectionNotificationTemplate(
       ctx.name || '',