feat(ui.js): Freigabe-Schaltfläche als Symbolleisten-Schaltfläche hinzugefügt.

- Share-Button auf der linken Seite der Kopfzeile entfernt

EnvelopeGenerator.Web/wwwroot/js/ui.js

@@ -51,7 +51,7 @@
 
   static configurePSPDFKit(instance, handler) {
     const toolbarItems = UI.getToolbarItems(instance, handler)
-    toolbarItems.push({type: "export-pdf"})
+    toolbarItems.push({ type: "export-pdf" })
     instance.setToolbarItems(toolbarItems)
   }
 
@@ -74,7 +74,20 @@
   }
 
   static getCustomItems = function (callback) {
-    return []
+    return [
+      {
+        type: 'custom',
+        id: 'button-share',
+        className: 'button-share',
+        title: 'Teilen',
+        onPress() {
+          callback('SHARE')
+        },
+        icon: `<svg width="30" height="30" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                <path d="M20 13V17.5C20 20.5577 16 20.5 12 20.5C8 20.5 4 20.5577 4 17.5V13M12 3L12 15M12 3L16 7M12 3L8 7" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
+              </svg>`,
+      }
+    ]
     return [
       {
         type: 'custom',