13,689 new quiz questions in 160 practice islands (grades 3-12), Question.figure, replay rotates the quiz, LaTeX removed from lesson/question text

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

content/migrations/0019_question_figure.py

@@ -0,0 +1,12 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [('content', '0018_split_long_calculus_nodes')]
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='figure',
+            field=models.JSONField(blank=True, null=True),
+        ),
+    ]