feat(growth): add WHO percentile growth curves, Chart.js collapsible section, and tests

skills/datastore/tests/test_datastore.py

@@ -782,6 +782,35 @@ def test_growth_logging(temp_datastore: DatastoreEngine):
     assert summary["growth_latest"]["height_cm"] == 67.5
 
 
+def test_website_growth_html_rendering(temp_datastore: DatastoreEngine):
+    """Verifies that update_website generates valid HTML containing the growth section and Chart.js code."""
+    from update_website import generate_dashboard_html
+
+    temp_datastore.put_entity(
+        collection="people",
+        record={"id": "mila", "name": "Mila Graf", "birthdate": "2026-03-14", "role": "child"},
+    )
+    temp_datastore.add_event(
+        kind="growth.measurement",
+        subject="mila",
+        actor="agent:hebamme",
+        start="2026-10-12T10:00:00+02:00",
+        payload={"weight_kg": 7.45, "height_cm": 68.0},
+        note="U5 Untersuchung",
+    )
+
+    html = generate_dashboard_html(temp_datastore)
+    assert "Körpergröße & Gewicht (WHO-Perzentilen)" in html
+    assert "7.45 kg" in html
+    assert "68.0 cm" in html
+    assert "U5 Untersuchung" in html
+    assert "chart.umd.min.js" in html
+    assert "growthChart" in html
+    assert "who_weight" in html
+    assert "who_height" in html
+
+
+