added abilty to edit and delete collections

lib/widgets/edit_dialog_widgets/edit_dialog_actions.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart'
+    show TextButton, FloatingActionButton, Icons;
+import 'package:flutter/widgets.dart';
+
+class EditDialogActions extends StatelessWidget {
+  const EditDialogActions({super.key, required this.onSavePressed});
+  final VoidCallback onSavePressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: Text('Cancel'),
+        ),
+        FloatingActionButton(onPressed: onSavePressed, child: Icon(Icons.save)),
+      ],
+    );
+  }
+}

lib/widgets/edit_dialog_widgets/edit_dialog_title.dart

@@ -0,0 +1,40 @@
+import 'package:flutter/material.dart' show TextButton, Theme;
+import 'package:flutter/widgets.dart';
+
+class EditDialogTitle extends StatelessWidget {
+  const EditDialogTitle({
+    super.key,
+    this.onDeletePressed,
+    required this.dialogType,
+  });
+  final VoidCallback? onDeletePressed;
+  final DialogType dialogType;
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        // TODO: Localize
+        if (dialogType == DialogType.bookmark)
+          Text('Create Bookmark')
+        else
+          Text('Create Collection'),
+
+        if (onDeletePressed != null)
+          TextButton(
+            onPressed: () {
+              onDeletePressed!.call();
+              Navigator.of(context).pop();
+            },
+            child: Text(
+              'Delete',
+              style: TextStyle(color: Theme.of(context).colorScheme.error),
+            ),
+          ),
+      ],
+    );
+  }
+}
+
+enum DialogType { bookmark, collection }