add top logout button in user settings page

Place a dedicated Logout button at the top of the Benutzer-Einstellungen page and wire it to the existing logout flow. Keep button state in sync with login status like the header menu logout action.

public/index.html

@@ -257,6 +257,9 @@
 
         <section class="grid-layout" id="pageUser" hidden>
           <article class="card stagger" id="userSettingsCard">
+            <div class="actions" style="justify-content: flex-end; margin-bottom: 0.6rem;">
+              <button id="settingsLogoutTopBtn" type="button" class="danger">Logout</button>
+            </div>
             <h2>Benutzer-Einstellungen</h2>
             <p class="muted">Hier findest du nur deine persoenlichen Einstellungen.</p>
             <dl class="status-grid">