Extract default config to const to avoid duplication

client/src/composables/__mocks__/config.ts

@@ -1,8 +1,8 @@
 import { vi } from "vitest";
 import { ref } from "vue";
 
-// Default mock config values that tests can override
-const mockConfig = ref({
+// Default mock config values
+const defaultConfig = {
     allow_local_account_creation: true,
     enable_oidc: false,
     mailing_join_addr: "",
@@ -14,7 +14,9 @@ const mockConfig = ref({
     welcome_url: "",
     citation_bibtex: "",
     toolbox_auto_sort: false,
-});
+};
+
+const mockConfig = ref({ ...defaultConfig });
 
 export const useConfig = vi.fn(() => ({
     config: mockConfig,
@@ -28,17 +30,5 @@ export function setMockConfig(config: Record<string, any>) {
 
 // Helper function to reset config to defaults
 export function resetMockConfig() {
-    mockConfig.value = {
-        allow_local_account_creation: true,
-        enable_oidc: false,
-        mailing_join_addr: "",
-        prefer_custos_login: false,
-        registration_warning_message: "",
-        server_mail_configured: false,
-        show_welcome_with_login: false,
-        terms_url: "",
-        welcome_url: "",
-        citation_bibtex: "",
-        toolbox_auto_sort: false,
-    };
+    mockConfig.value = { ...defaultConfig };
 }