feat(frontend): added frontend

- Router: client side route handling with client side rendering
- Toast: rought Toast handling for better UX and messaging
- Auth: single point of truth for the Logged in user

This commit doesnt not include the openapi generated code

frontend/src/auth/index.ts

@@ -0,0 +1,51 @@
+import { showError } from "@app/toast";
+import client from '@app/api';
+
+export type User = {
+  id: string;
+  guest: boolean;
+  name: string;
+};
+
+let currentUser: User | null = null;
+
+export function getUser(): Readonly<User> | null {
+  return currentUser;
+}
+
+export function isLogged(): boolean {
+  return currentUser === null;
+}
+
+export function setUser(newUser: User | null) {
+  currentUser = newUser;
+}
+
+export async function updateUser(): Promise<Readonly<User> | null> {
+  try {
+    let res = await client.getUser({ user: 'me' });
+
+    if (res.kind === "success") {
+      setUser(res.payload);
+      return res.payload;
+    } else if (res.kind === "failure") {
+      // well no user :D
+      setUser(null);
+      return null;
+    } else if (res.kind === "notLoggedIn") {
+      setUser(null);
+      return null;
+    } else {
+      setUser(null);
+      showError(`unknown response: ${JSON.stringify(res)}`);
+      return null;
+    }
+  } catch (e) {
+    setUser(null);
+    showError(`failed to get user: ${e}`);
+    return null;
+  }
+}
+
+Object.assign(window as any, { getUser, setUser, updateUser, isLogged });
+