Fix layout: add Smarty template inheritance for Hummingbird theme

Hummingbird (PS8) requires module front controller templates to explicitly
extend a layout via {extends}. Without it, the template renders as a bare
HTML fragment without the theme wrapper (no header, CSS, nav, footer).

All three front templates now extend layouts/layout-full-width.tpl and
define their content inside {block name='content'}.

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

views/templates/front/confirm.tpl

@@ -1,3 +1,6 @@
+{extends file='layouts/layout-full-width.tpl'}
+
+{block name='content'}
 <section class="cyp-withdrawal-page">
   <header class="page-header">
     <h1>{l s='Widerruf bestätigen' mod='simple_withdrawalbutton'}</h1>
@@ -5,7 +8,7 @@
 
   <div class="cyp-steps">
     <div class="cyp-step done">
-      <div class="cyp-step-bubble">✓</div>
+      <div class="cyp-step-bubble">&#10003;</div>
       <div class="cyp-step-label">{l s='Angaben' mod='simple_withdrawalbutton'}</div>
     </div>
     <div class="cyp-step-line done"></div>
@@ -107,3 +110,4 @@
     </form>
   </div>
 </section>
+{/block}

views/templates/front/form.tpl

@@ -1,3 +1,6 @@
+{extends file='layouts/layout-full-width.tpl'}
+
+{block name='content'}
 <section class="cyp-withdrawal-page">
   <header class="page-header">
     <h1>{l s='Widerruf erklären' mod='simple_withdrawalbutton'}</h1>
@@ -33,7 +36,7 @@
         display:flex; align-items:center; gap:10px; background:#eef2f8;
         border:1px solid #c5d4eb; border-radius:6px; padding:11px 14px;
         font-size:13px; color:var(--cyw-accent); margin-bottom:24px;">
-        <span style="font-size:16px;">📅</span>
+        <span style="font-size:16px;">&#128197;</span>
         <span>
           {l s='Widerrufsfrist (14 Tage ab Bestelldatum): bis' mod='simple_withdrawalbutton'}
           <strong>{$withdrawal_deadline|escape:'html':'UTF-8'}</strong>
@@ -164,3 +167,4 @@
   update();
 })();
 </script>
+{/block}

views/templates/front/success.tpl

@@ -1,3 +1,6 @@
+{extends file='layouts/layout-full-width.tpl'}
+
+{block name='content'}
 <section class="cyp-withdrawal-page">
   <header class="page-header">
     <h1>{l s='Widerruf übermittelt' mod='simple_withdrawalbutton'}</h1>
@@ -5,12 +8,12 @@
 
   <div class="cyp-steps">
     <div class="cyp-step done">
-      <div class="cyp-step-bubble">✓</div>
+      <div class="cyp-step-bubble">&#10003;</div>
       <div class="cyp-step-label">{l s='Angaben' mod='simple_withdrawalbutton'}</div>
     </div>
     <div class="cyp-step-line done"></div>
     <div class="cyp-step done">
-      <div class="cyp-step-bubble">✓</div>
+      <div class="cyp-step-bubble">&#10003;</div>
       <div class="cyp-step-label">{l s='Prüfen' mod='simple_withdrawalbutton'}</div>
     </div>
     <div class="cyp-step-line done"></div>
@@ -22,7 +25,7 @@
 
   <div class="card card-block">
     <div class="cyp-success-header">
-      <div class="cyp-success-icon" aria-hidden="true">✓</div>
+      <div class="cyp-success-icon" aria-hidden="true">&#10003;</div>
       {if isset($success_data.mail_ok) && $success_data.mail_ok}
         <h2>{l s='Ihr Widerruf wurde erfolgreich übermittelt.' mod='simple_withdrawalbutton'}</h2>
         <p>{l s='Eine Eingangsbestätigung wurde an Ihre E-Mail-Adresse gesendet.' mod='simple_withdrawalbutton'}</p>
@@ -95,7 +98,8 @@
     </div>
 
     <button class="cyp-print-btn" onclick="window.print()" type="button">
-      ⎙ {l s='Seite drucken / als PDF speichern' mod='simple_withdrawalbutton'}
+      &#9113; {l s='Seite drucken / als PDF speichern' mod='simple_withdrawalbutton'}
     </button>
   </div>
 </section>
+{/block}