Support build-time specified protocol scheme for oidc callback (#2285)

src/@types/global.d.ts

@@ -13,11 +13,13 @@ import { type AppLocalization } from "../language-helper.js";
 // global type extensions need to use var for whatever reason
 /* eslint-disable no-var */
 declare global {
+    type IConfigOptions = Record<string, any>;
+
     var mainWindow: BrowserWindow | null;
     var appQuitting: boolean;
     var appLocalization: AppLocalization;
     var launcher: AutoLaunch;
-    var vectorConfig: Record<string, any>;
+    var vectorConfig: IConfigOptions;
     var trayConfig: {
         // eslint-disable-next-line camelcase
         icon_path: string;