fix: floating bookmarks

- update floating bookmarks
- fix search suggestions
- fix filters

backend/apps/annotations/migrations/0004_alter_bookmark_content_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.1.7 on 2026-06-04 03:31
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('annotations', '0003_bookmark_highlight_color'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='bookmark',
+            name='content',
+            field=models.TextField(blank=True, default='', help_text='Optional user thought; empty means bookmark-only'),
+        ),
+        migrations.AlterField(
+            model_name='bookmark',
+            name='highlight_color',
+            field=models.CharField(default='#fde047', help_text='Hex color for in-book passage highlight (e.g. #fde047)', max_length=7),
+        ),
+    ]