email(healthcare): restore the no-login/no-2FA convenience blurb

Adds a teal 'No logins, no 2FA codes, no headaches' card (between the fee and
the CTA): we do the whole revalidation, you never share a password or chase a
two-factor code, just a one-minute e-signature. Mirrors the npi-revalidation
service page's convenience pitch, kept clean of form numbers.

data/hc_campaigns/hc_revalidation_overdue.html

@@ -55,6 +55,13 @@
     <tr><td style="padding:8px 0;color:#6b7280;">Our service fee to file it for you</td><td style="padding:8px 0;font-weight:700;text-align:right;color:#047857;">$599</td></tr>
   </table>
 
+  <!-- Convenience: no password / no login / no 2FA: we do the work, you just e-sign -->
+  <table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="margin:18px 0;"><tr><td style="background:#f0fdfa;border:1px solid #99f6e4;border-radius:10px;padding:18px;">
+    <h3 style="margin:0 0 10px;font-size:15px;color:#0f766e;font-weight:700;">No logins, no 2FA codes, no headaches</h3>
+    <p style="font-size:13px;color:#134e4a;line-height:1.7;margin:0 0 10px;">We complete the entire revalidation for you and track it through to confirmation. <strong>You never share your password and you never have to log in or chase a two-factor code.</strong> The only thing we may need is a one-minute e-signature on a secure link.</p>
+    <p style="font-size:13px;color:#134e4a;line-height:1.7;margin:0;">That's it. We handle the rest and keep you posted until it's confirmed.</p>
+  </td></tr></table>
+
   <!-- CTA -->
   <table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="margin:22px 0;"><tr><td style="background:#ecfdf5;border:2px solid #10b981;border-radius:10px;padding:18px;text-align:center;">
     <p style="font-size:14px;color:#065f46;margin:0 0 6px;font-weight:600;">We file your Medicare revalidation for you, before the clock runs out.</p>