Fix: Performance in Druckvorschau massiv verbessert, Hintergrundbild entfernt und Code-Duplikat bereinigt

src/storage_locations.php

@@ -357,23 +357,45 @@ window.renderAllBarcodes = function() {
 
 <style>
 @media print {
-    body * {
-        visibility: hidden;
+    /* Hide everything in the body by default */
+    body > *:not(.modal) {
+        display: none !important;
     }
-    body {
+    /* Hide other modals */
+    body > .modal:not(#printModal) {
+        display: none !important;
+    }
+    /* Remove wallpaper overlay */
+    body::before {
+        display: none !important;
+        content: none !important;
+    }
+    body, html {
         background: none !important;
         background-color: white !important;
+        margin: 0 !important;
+        padding: 0 !important;
     }
-    #printModal, #printModal * {
-        visibility: visible;
-    }
+    
     #printModal {
-        position: absolute;
-        left: 0;
-        top: 0;
-        width: 100%;
-        margin: 0;
-        padding: 0;
+        display: block !important;
+        opacity: 1 !important;
+        position: static !important;
+        background: white !important;
+    }
+    #printModal * {
+        visibility: visible !important;
+    }
+    .modal-dialog {
+        max-width: 100% !important;
+        margin: 0 !important;
+        padding: 0 !important;
+        transform: none !important;
+    }
+    .modal-content {
+        border: none !important;
+        box-shadow: none !important;
+        background: white !important;
     }
     .modal-header, .modal-footer, .d-print-none {
         display: none !important;
@@ -384,18 +406,12 @@ window.renderAllBarcodes = function() {
         justify-content: flex-start !important;
         gap: 0 !important;
         width: 100% !important;
+        margin: 0 !important;
+        padding: 0 !important;
     }
     .print-item {
         display: inline-block !important;
     }
-    .modal-dialog {
-        max-width: 100%;
-        margin: 0;
-    }
-    .modal-content {
-        border: none;
-        box-shadow: none;
-    }
     .modal-backdrop {
         display: none !important;
     }
@@ -443,25 +459,4 @@ window.renderAllBarcodes = function() {
   </div>
 </div>
 
-<?php require_once 'footer.php'; ?>
-       <img id="barcodeImage" src="" alt="QR Code" class="img-fluid border p-2 bg-white mb-3" style="max-width: 250px;">
-        <div class="mt-2">
-             <a id="barcodeLink" href="" target="_blank" class="btn btn-outline-primary btn-sm"><i class="fas fa-external-link-alt me-2"></i>Link manuell testen</a>
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-
-<?php require_once 'footer.php'; ?>
-?php require_once 'footer.php'; ?>
-       <img id="barcodeImage" src="" alt="QR Code" class="img-fluid border p-2 bg-white mb-3" style="max-width: 250px;">
-        <div class="mt-2">
-             <a id="barcodeLink" href="" target="_blank" class="btn btn-outline-primary btn-sm"><i class="fas fa-external-link-alt me-2"></i>Link manuell testen</a>
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-
 <?php require_once 'footer.php'; ?>