fix: Callback bestätigt direkt statt Weiterleitung (Sitzung gehört danach dem technischen Konto)

Claude-Session: https://claude.ai/code/session_01SqzF6qT3TQ8ej3wigEuMSu

index.html

@@ -19,8 +19,9 @@
         </form>
         {% endif %}
         {% else %}
-        <p>The collection mailbox is not connected yet. Open this page in a private window and sign in
-           as <strong>{{ email_address }}</strong> (technical account) – not with your own account.</p>
+        <p>The collection mailbox is not connected yet. In a private window: open this page, sign in with
+           <strong>your own account</strong>, click “Connect mailbox”, then sign in as
+           <strong>{{ email_address }}</strong> (technical account).</p>
         <form action="/connect" method="get">
             <button type="submit" class="btn-primary">Connect mailbox</button>
         </form>