chore: fix pghistory migration deps and improve htmx utilities

- Update pghistory dependency from 0007 to 0006 in account migrations
- Add docstrings and remove unused imports in htmx_forms.py
- Add DJANGO_SETTINGS_MODULE bash commands to Claude settings
- Add state transition definitions for ride statuses

backend/apps/moderation/serializers.py

@@ -745,3 +745,37 @@ class UserModerationProfileSerializer(serializers.Serializer):
     account_status = serializers.CharField()
     last_violation_date = serializers.DateTimeField(allow_null=True)
     next_review_date = serializers.DateTimeField(allow_null=True)
+
+
+# ============================================================================
+# FSM Transition History Serializers
+# ============================================================================
+
+
+class StateLogSerializer(serializers.ModelSerializer):
+    """Serializer for FSM transition history."""
+
+    user = serializers.CharField(source='by.username', read_only=True)
+    model = serializers.CharField(source='content_type.model', read_only=True)
+    from_state = serializers.CharField(source='source_state', read_only=True)
+    to_state = serializers.CharField(source='state', read_only=True)
+    reason = serializers.CharField(source='description', read_only=True)
+
+    class Meta:
+        from django_fsm_log.models import StateLog
+        model = StateLog
+        fields = [
+            'id',
+            'timestamp',
+            'model',
+            'object_id',
+            'state',
+            'from_state',
+            'to_state',
+            'transition',
+            'user',
+            'description',
+            'reason',
+        ]
+        read_only_fields = fields
+