started refactoring (app) layout

src/app.d.ts

@@ -3,11 +3,19 @@
 declare global {
     namespace App {
         // interface Error {}
-        // interface Locals {}
+        interface Locals {
+            user: User
+        }
         // interface PageData {}
         // interface PageState {}
         // interface Platform {}
     }
+
+    interface User {
+        id: string
+        username: string
+        password?: string
+    }
 }
 
 export {}