Map display EnergyElements on full-SAP certs for the FE panel 🟩

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

datatypes/epc/domain/mapper.py

@@ -811,7 +811,27 @@ class EpcPropertyDataMapper:
             roofs=EpcPropertyDataMapper._map_energy_elements(schema.roofs),
             walls=EpcPropertyDataMapper._map_energy_elements(schema.walls),
             floors=EpcPropertyDataMapper._map_energy_elements(schema.floors),
-            main_heating=[],
+            # Display elements for the FE property-details panel (the calculator
+            # reads the measured sap_* fields below, not these). Parity with
+            # from_rdsap_schema_17_1; full-SAP lodges windows under plural key.
+            main_heating=EpcPropertyDataMapper._map_energy_elements(
+                schema.main_heating
+            ),
+            window=(
+                EpcPropertyDataMapper._map_energy_element(schema.windows)
+                if schema.windows is not None
+                else None
+            ),
+            lighting=(
+                EpcPropertyDataMapper._map_energy_element(schema.lighting)
+                if schema.lighting is not None
+                else None
+            ),
+            hot_water=(
+                EpcPropertyDataMapper._map_energy_element(schema.hot_water)
+                if schema.hot_water is not None
+                else None
+            ),
             # D2: vertical-window openings (opening-type 4) → sap_windows;
             # roof-window openings (opening-type 5) → sap_roof_windows.
             sap_windows=EpcPropertyDataMapper._sap_17_1_windows(schema),

datatypes/epc/schema/sap_schema_17_1.py

@@ -215,6 +215,14 @@ class SapSchema17_1:
     secondary_heating: Optional[EnergyElement] = None
     # "SAP" for this family (vs "RdSAP"); carried for provenance / the panel.
     assessment_type: Optional[str] = None
+    # Human-facing display elements (description + ratings) for the property-
+    # details panel — distinct from the measured/structural fields the calculator
+    # reads. Dropped by the WIP mapper → all "Unknown" on the FE (ADR-0037).
+    # Full-SAP lodges windows under the plural key (a single element, not a list).
+    main_heating: List[EnergyElement] = field(default_factory=list)
+    windows: Optional[EnergyElement] = None
+    lighting: Optional[EnergyElement] = None
+    hot_water: Optional[EnergyElement] = None
     # measured living-room area (m²); the engine consumes it via a back-solved
     # habitable_rooms_count (Table 27). Optional — 100% present in the corpus.
     living_area: Optional[Union[int, float]] = None