feat(awards): notify jurors on assignment + admin reminder button

The previous addJuror / bulkAddJurors / bulkInviteJurors flows silently
created AwardJuror rows with no notification when the user already had
an account. The result: assigned jurors had no idea they were assigned
unless they happened to log in and check /jury/awards manually.

Three changes:

1. New email template + sender (sendAwardJurorNotificationEmail). Tells
   the juror what the award is, how many projects are eligible, when
   voting closes, and links straight to /jury/awards/<id>. Reused for
   both the initial assignment notification and admin reminders.

2. Auto-send on assignment. addJuror / bulkAddJurors / bulkInviteJurors
   now send the email to newly-attached jurors. bulkInviteJurors checks
   for a prior AwardJuror row before sending so duplicate "Bulk Invite"
   clicks don't spam jurors who were already assigned. addJuror /
   bulkAddJurors accept a `sendEmail` flag so admin tooling can opt out.

3. New admin procedure specialAward.notifyJurors(awardId, userIds?,
   customMessage?). Surfaced in the Jurors tab as a "Send reminder to
   all" button at the top and a per-row mail icon for individual
   reminders. Audit-logged with action: 'JUROR_REMINDER'.

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

src/lib/email.ts

@@ -564,6 +564,79 @@ Together for a healthier ocean.
   }
 }
 
+/**
+ * Generate award juror notification template — used when an admin assigns a
+ * juror to a special award and when sending follow-up reminders. Tells the
+ * juror what the award is, how many projects are eligible, and links them
+ * straight to the voting page.
+ */
+function getAwardJurorNotificationTemplate(
+  name: string,
+  awardName: string,
+  url: string,
+  options?: {
+    eligibleCount?: number
+    votingEndAt?: Date | null
+    customMessage?: string
+    isReminder?: boolean
+  },
+): EmailTemplate {
+  const greeting = name ? `Hello ${name},` : 'Hello,'
+  const eligibleCount = options?.eligibleCount
+  const votingEndAt = options?.votingEndAt
+  const customMessage = options?.customMessage?.trim()
+  const isReminder = options?.isReminder ?? false
+
+  const lead = isReminder
+    ? `This is a reminder that you've been assigned as a juror for <strong style="color: ${BRAND.darkBlue};">${escapeHtml(awardName)}</strong>.`
+    : `You've been assigned as a juror for <strong style="color: ${BRAND.darkBlue};">${escapeHtml(awardName)}</strong>.`
+
+  const projectsLine = typeof eligibleCount === 'number' && eligibleCount > 0
+    ? paragraph(`There ${eligibleCount === 1 ? 'is' : 'are'} <strong>${eligibleCount}</strong> eligible project${eligibleCount === 1 ? '' : 's'} for you to review.`)
+    : ''
+
+  const deadlineLine = votingEndAt
+    ? paragraph(`<strong>Voting closes:</strong> ${escapeHtml(votingEndAt.toLocaleString('en-GB', { dateStyle: 'long', timeStyle: 'short' }))}`)
+    : ''
+
+  const customMessageHtml = customMessage
+    ? `<div style="color: ${BRAND.textDark}; font-size: 15px; line-height: 1.7; margin: 20px 0; padding: 20px; background-color: ${BRAND.lightGray}; border-radius: 8px;">${escapeHtml(customMessage).replace(/\n/g, '<br>')}</div>`
+    : ''
+
+  const content = `
+    ${sectionTitle(greeting)}
+    ${paragraph(lead)}
+    ${projectsLine}
+    ${deadlineLine}
+    ${customMessageHtml}
+    ${ctaButton(url, 'Review & Vote')}
+    <p style="color: ${BRAND.textMuted}; margin: 20px 0 0 0; font-size: 13px; text-align: center;">
+      Sign in with your existing MOPC credentials to access the voting page.
+    </p>
+  `
+
+  return {
+    subject: isReminder
+      ? `Reminder: vote for the ${awardName}`
+      : `You've been assigned as a juror for ${awardName}`,
+    html: getEmailWrapper(content),
+    text: `
+${greeting}
+
+${isReminder ? 'This is a reminder that you' : 'You'}'ve been assigned as a juror for ${awardName}.
+${typeof eligibleCount === 'number' && eligibleCount > 0 ? `\nThere ${eligibleCount === 1 ? 'is' : 'are'} ${eligibleCount} eligible project${eligibleCount === 1 ? '' : 's'} for you to review.` : ''}${votingEndAt ? `\nVoting closes: ${votingEndAt.toLocaleString('en-GB', { dateStyle: 'long', timeStyle: 'short' })}` : ''}
+${customMessage ? `\n${customMessage}\n` : ''}
+Review & vote: ${url}
+
+Sign in with your existing MOPC credentials to access the voting page.
+
+---
+Monaco Ocean Protection Challenge
+Together for a healthier ocean.
+    `,
+  }
+}
+
 /**
  * Generate jury invitation email template
  */
@@ -2308,6 +2381,29 @@ export async function sendInvitationEmail(
   await sendEmail({ to: email, subject: template.subject, text: template.text, html: template.html })
 }
 
+/**
+ * Send award juror notification — used both for the initial assignment
+ * notification and for admin-triggered reminders.
+ */
+export async function sendAwardJurorNotificationEmail(opts: {
+  email: string
+  name: string | null
+  awardName: string
+  url: string
+  eligibleCount?: number
+  votingEndAt?: Date | null
+  customMessage?: string
+  isReminder?: boolean
+}): Promise<void> {
+  const template = getAwardJurorNotificationTemplate(opts.name || '', opts.awardName, opts.url, {
+    eligibleCount: opts.eligibleCount,
+    votingEndAt: opts.votingEndAt,
+    customMessage: opts.customMessage,
+    isReminder: opts.isReminder,
+  })
+  await sendEmail({ to: opts.email, subject: template.subject, text: template.text, html: template.html })
+}
+
 /**
  * Send jury invitation email (round-specific)
  */