feat(story-1.5): add React frontend with auth pages and dark theme

web/src/api/auth.ts

@@ -0,0 +1,83 @@
+const API_BASE = '/api/v1';
+
+interface RegisterRequest {
+    email: string;
+    password: string;
+}
+
+interface LoginRequest {
+    email: string;
+    password: string;
+}
+
+interface User {
+    id: string;
+    email: string;
+    is_admin: boolean;
+}
+
+interface LoginResponse {
+    token: string;
+    expires_at: string;
+    user: User;
+}
+
+interface RegisterResponse {
+    id: string;
+    email: string;
+    created_at: string;
+}
+
+class ApiError extends Error {
+    constructor(public status: number, message: string) {
+        super(message);
+        this.name = 'ApiError';
+    }
+}
+
+async function handleResponse<T>(response: Response): Promise<T> {
+    if (!response.ok) {
+        const error = await response.json().catch(() => ({ error: 'Request failed' }));
+        throw new ApiError(response.status, error.error || 'Request failed');
+    }
+    return response.json();
+}
+
+export const authApi = {
+    async register(data: RegisterRequest): Promise<RegisterResponse> {
+        const response = await fetch(`${API_BASE}/auth/register`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            credentials: 'include',
+            body: JSON.stringify(data),
+        });
+        return handleResponse<RegisterResponse>(response);
+    },
+
+    async login(data: LoginRequest): Promise<LoginResponse> {
+        const response = await fetch(`${API_BASE}/auth/login`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            credentials: 'include',
+            body: JSON.stringify(data),
+        });
+        return handleResponse<LoginResponse>(response);
+    },
+
+    async logout(): Promise<void> {
+        await fetch(`${API_BASE}/auth/logout`, {
+            method: 'POST',
+            credentials: 'include',
+        });
+    },
+
+    async getMe(): Promise<User> {
+        const response = await fetch(`${API_BASE}/users/me`, {
+            credentials: 'include',
+        });
+        return handleResponse<User>(response);
+    },
+};
+
+export { ApiError };
+export type { User, LoginResponse, RegisterResponse };