Fix email links broken in Outlook and standardize all email URLs

- Rewrite ctaButton to use td-background pattern (works in all clients
  including Outlook, Gmail, Yahoo, Apple Mail) instead of VML/conditional
  comments that broke link clicking in Outlook desktop
- Add plaintext fallback URL below every CTA button so users always have
  a working link even if the button fails
- Add getBaseUrl() and ensureAbsoluteUrl() helpers in email.ts to
  guarantee all email links are absolute https:// URLs
- Apply ensureAbsoluteUrl safety net in sendStyledNotificationEmail and
  sendNotificationEmail so relative paths can never reach email templates
- Standardize all NEXTAUTH_URL fallbacks to https://portal.monaco-opc.com
  (was inconsistently http://localhost:3000 or https://monaco-opc.com)
- Fix legacy notification.ts: wrong argument order in
  sendJuryInvitationEmail (URL was passed as name parameter)
- Fix legacy notification.ts: missing NEXTAUTH_URL fallback for
  evaluation reminder URL construction
- Change tooltip styling from red bg to white bg with black text

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server/routers/round.ts

@@ -495,7 +495,7 @@ export const roundRouter = router({
                 `Your project has advanced to: ${targetRound.name}`,
                 `Congratulations! Your project "${project.title}" has advanced from "${currentRound.name}" to "${targetRound.name}" in the Monaco Ocean Protection Challenge.`,
                 'View Your Dashboard',
-                `${process.env.NEXTAUTH_URL || 'https://monaco-opc.com'}/dashboard`,
+                `${process.env.NEXTAUTH_URL || 'https://portal.monaco-opc.com'}/dashboard`,
               ).catch((err) => {
                 console.error(`[advanceProjects] notifyOnAdvance email failed for ${email}:`, err)
               })