added edit bookmark capabilities

lib/widgets/create_bookmark_dialog.dart

@@ -8,11 +8,13 @@ class CreateBookmarkDialog extends StatelessWidget {
   const CreateBookmarkDialog({
     super.key,
     required this.collectionId,
-    required this.onSavePressed,
+    this.onSavePressed,
+    this.onDeletePressed,
     this.selectedBookmark,
     this.selectedMapsLink,
   });
-  final void Function(Bookmark bookmark) onSavePressed;
+  final void Function(Bookmark bookmark)? onSavePressed;
+  final void Function()? onDeletePressed;
   final int collectionId;
   final Bookmark? selectedBookmark;
   final MapsLinkMetadata? selectedMapsLink;
@@ -27,6 +29,10 @@ class CreateBookmarkDialog extends StatelessWidget {
       nameController.text = selectedMapsLink!.placeName;
       linkController.text = selectedMapsLink!.url;
       descriptionController.text = selectedMapsLink!.description;
+    } else if (selectedBookmark != null) {
+      nameController.text = selectedBookmark!.name;
+      linkController.text = selectedBookmark!.link;
+      descriptionController.text = selectedBookmark!.description;
     }
 
     return AlertDialog(
@@ -91,7 +97,7 @@ class CreateBookmarkDialog extends StatelessWidget {
         ),
       ),
       actions: [
-        Column(
+        Row(
           mainAxisAlignment: MainAxisAlignment.spaceBetween,
           children: [
             TextButton(
@@ -100,18 +106,31 @@ class CreateBookmarkDialog extends StatelessWidget {
             ),
             FloatingActionButton(
               onPressed: () {
-                onSavePressed(
-                  Bookmark(
-                    collectionId: collectionId,
-                    name: nameController.text,
-                    link: linkController.text,
-                    description: descriptionController.text,
-                  ),
-                );
+                final bookmark =
+                    selectedBookmark?.copyWith(
+                      name: nameController.text,
+                      link: linkController.text,
+                      description: descriptionController.text,
+                    ) ??
+                    Bookmark(
+                      collectionId: collectionId,
+                      name: nameController.text,
+                      link: linkController.text,
+                      description: descriptionController.text,
+                    );
+                onSavePressed?.call(bookmark);
                 Navigator.of(context).pop();
               },
               child: Icon(Icons.save),
             ),
+            if (selectedBookmark != null)
+              TextButton(
+                onPressed: () {
+                  onDeletePressed?.call();
+                  Navigator.of(context).pop();
+                },
+                child: Text('Delete'),
+              ),
           ],
         ),
       ],