Add product-area presentation to Views

src/govoplan_views/backend/router.py

@@ -111,6 +111,21 @@ def _catalogue(
     )
 
 
+def _product_area_ids(
+    session: Session,
+    principal: ApiPrincipal,
+) -> frozenset[str]:
+    active_module_ids = {
+        surface.module_id for surface in _catalogue(session, principal)
+    }
+    return frozenset(
+        area.id
+        for manifest in get_registry().manifests()
+        if manifest.id in active_module_ids and manifest.frontend is not None
+        for area in manifest.frontend.product_areas
+    )
+
+
 def _view_governance_policy():
     return view_governance_policy(get_registry())
 
@@ -507,6 +522,7 @@ def _effective_response(state: EffectiveViewState) -> EffectiveViewResponse:
         active_revision_id=effective.revision_id,
         active_view_name=effective.name,
         visible_surface_ids=sorted(effective.visible_surface_ids),
+        presentation=dict(effective.presentation),
         projection_active=effective.projection_active,
         locked=effective.locked,
         available_views=[
@@ -753,6 +769,8 @@ def api_create_definition(
             visible_surface_ids=payload.visible_surface_ids,
             catalogue=_catalogue(session, principal),
             actor_id=_actor_id(principal),
+            presentation=payload.presentation,
+            available_product_area_ids=_product_area_ids(session, principal),
         )
         _audit(
             session,
@@ -892,6 +910,8 @@ def api_create_revision(
             visible_surface_ids=payload.visible_surface_ids,
             catalogue=_catalogue(session, principal),
             actor_id=_actor_id(principal),
+            presentation=payload.presentation,
+            available_product_area_ids=_product_area_ids(session, principal),
         )
         _audit(
             session,