feat: separate webapp favicon configuration in appearance admin panel section

tests/test_webapp_route_contract.py

@@ -143,6 +143,7 @@ class WebAppRouteContractTests(unittest.TestCase):
             ("GET", "/api/admin/themes"): "admin_themes_get_route",
             ("PUT", "/api/admin/themes"): "admin_themes_save_route",
             ("POST", "/api/admin/appearance/logo"): "admin_appearance_logo_upload_route",
+            ("POST", "/api/admin/appearance/favicon"): "admin_appearance_favicon_upload_route",
             ("GET", "/api/admin/panel/internal-squads"): "admin_panel_internal_squads_route",
         }
 
@@ -167,6 +168,19 @@ class WebAppRouteContractTests(unittest.TestCase):
 
         self.assertEqual(match_info.handler.__name__, "index_route")
 
+    def test_webapp_favicon_asset_route_is_registered(self):
+        app = web.Application()
+        subscription_webapp.setup_subscription_webapp_routes(app)
+
+        request = make_mocked_request(
+            "GET",
+            "/webapp-favicon/abcdef1234567890/icon-180.png",
+            app=app,
+        )
+        match_info = asyncio.run(app.router.resolve(request))
+
+        self.assertEqual(match_info.handler.__name__, "webapp_favicon_route")
+
 
 class AdminApiAuthContractTests(unittest.IsolatedAsyncioTestCase):
     def _settings(self):