added edit bookmark capabilities

lib/pages/collection_page.dart

@@ -30,6 +30,19 @@ class _CollectionPageState extends State<CollectionPage> {
     ),
   );
 
+  void editBookmark(Bookmark selectedBookmark) => showDialog(
+    context: context,
+    builder: (context) => CreateBookmarkDialog(
+      collectionId: BookmarksProvider.selectedCollectionId!,
+      selectedBookmark: selectedBookmark,
+      onSavePressed: onBookmarkSaved,
+      onDeletePressed: () {
+        Storage.deleteBookmarkById(selectedBookmark.id);
+        setState(() {});
+      },
+    ),
+  );
+
   @override
   void initState() {
     super.initState();
@@ -39,7 +52,7 @@ class _CollectionPageState extends State<CollectionPage> {
   }
 
   void onBookmarkSaved(Bookmark bookmark) {
-    Storage.addBookmark(bookmark);
+    Storage.addOrUpdateBookmark(bookmark);
     setState(() {});
     context.read<SharedLinkProvider>().removeCurrentMapsLink();
   }
@@ -48,6 +61,7 @@ class _CollectionPageState extends State<CollectionPage> {
     return ListTile(
       title: Text(bookmark.name),
       onTap: () => launchUrlFromString(bookmark.link),
+      onLongPress: () => editBookmark(bookmark),
     );
   }
 
@@ -55,6 +69,7 @@ class _CollectionPageState extends State<CollectionPage> {
   Widget build(BuildContext context) {
     SharedLinkProvider provider = context.watch<SharedLinkProvider>();
     selectedMapsLink = provider.currentMapsLinkMetadata;
+
     if (BookmarksProvider.selectedCollectionId == null) {
       Navigator.of(context).pop();
     }