feat: manage tenant appearance defaults

tests/test_tenant_lifecycle.py

@@ -17,6 +17,7 @@ from govoplan_tenancy.backend.api.v1.schemas import (
     TenantUpdateRequest,
 )
 from govoplan_core.core.module_entitlements import MODULE_ENTITLEMENTS_KEY
+from govoplan_core.core.appearance import APPEARANCE_SETTINGS_KEY
 from govoplan_tenancy.backend.lifecycle import (
     TENANT_EVENT_CREATED,
     TENANT_EVENT_DELETION_REQUESTED,
@@ -135,18 +136,20 @@ class TenantUpdateHelperTests(unittest.TestCase):
         self.assertEqual("de", tenant.default_locale)
         self.assertEqual({"theme": "contrast"}, tenant.settings)
 
-    def test_tenant_content_update_preserves_reserved_module_entitlements(self) -> None:
+    def test_tenant_content_update_preserves_reserved_governed_settings(self) -> None:
         entitlement = {"schema_version": 1, "revision": 4}
+        appearance = {"default_palette": "forest", "palette_locked": True}
         tenant = SimpleNamespace(
             name="Old",
             description=None,
             default_locale="en",
-            settings={MODULE_ENTITLEMENTS_KEY: entitlement, "theme": "old"},
+            settings={MODULE_ENTITLEMENTS_KEY: entitlement, APPEARANCE_SETTINGS_KEY: appearance, "theme": "old"},
         )
         payload = TenantUpdateRequest(
             settings={
                 "theme": "contrast",
                 MODULE_ENTITLEMENTS_KEY: {"revision": 999},
+                APPEARANCE_SETTINGS_KEY: {"default_palette": "plum", "palette_locked": False},
             }
         )
 
@@ -154,6 +157,7 @@ class TenantUpdateHelperTests(unittest.TestCase):
 
         self.assertEqual("contrast", tenant.settings["theme"])
         self.assertEqual(entitlement, tenant.settings[MODULE_ENTITLEMENTS_KEY])
+        self.assertEqual(appearance, tenant.settings[APPEARANCE_SETTINGS_KEY])
 
     def test_tenant_status_update_prevents_suspending_current_tenant(self) -> None:
         tenant = SimpleNamespace(id="tenant-1", is_active=True)