Normalize URLs when checking for duplicates (#1169)

* Normalize URLs when checking for duplicates

* Improve migration script

bookmarks/migrations/0046_add_url_normalized_field.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.3 on 2025-08-22 08:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookmarks", "0045_userprofile_hide_bundles_bookmarkbundle"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="bookmark",
+            name="url_normalized",
+            field=models.CharField(blank=True, db_index=True, max_length=2048),
+        ),
+    ]