Add option for marking bookmarks as unread by default (#706)

* Added new option to set Mark as unread with a default

* Added additional test

* tweak test a bit

---------

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/migrations/0033_userprofile_default_mark_unread.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.3 on 2024-04-17 19:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookmarks", "0032_html_snapshots_hint_toast"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="userprofile",
+            name="default_mark_unread",
+            field=models.BooleanField(default=False),
+        ),
+    ]