update: improve registration confirmation email

Add food & accommodation reminder (Hub + Herrnhof), remove
contributions section, note upcoming follow-up emails.

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

lib/email.ts

@@ -65,18 +65,14 @@ export async function sendPaymentConfirmation(
         </table>
       </div>
 
-      ${data.contributions ? `
-      <div style="background: #f5f5f0; padding: 16px; border-radius: 8px; margin: 24px 0;">
-        <strong style="color: #92400e;">What you're bringing:</strong>
-        <p style="margin-bottom: 0; margin-top: 8px;">${data.contributions}</p>
-      </div>
-      ` : ""}
+      <h3 style="color: #92400e;">Food &amp; Accommodation</h3>
+      <p>If you haven't yet decided on food and accommodation, there's still time! The <strong>Commons Hub</strong> (our main venue with 30 on-site beds) and the nearby <strong><a href="https://herrnhof.at" style="color: #f59e0b;">Herrnhof</a></strong> are the most convenient and affordable options &mdash; right in the heart of the gathering. Other nearby options are also available; check the <a href="https://cryptocommonsgather.ing/directions" style="color: #f59e0b;">Directions page</a> for details.</p>
 
       <h3 style="color: #92400e;">What's Next?</h3>
       <ul style="line-height: 1.8;">
         <li>Join the <a href="https://t.me/+n5V_wDVKWrk1ZTBh" style="color: #f59e0b;">CCG26 Telegram group</a> to connect with other participants</li>
         <li>Start preparing your session proposals</li>
-        <li>Watch for pre-event communications with logistics details</li>
+        <li>We'll follow up with you via email in the coming weeks with further details on logistics, schedule, and how to make the most of your time in the valley</li>
       </ul>
 
       <p style="margin-top: 32px;">