feat(epic-3): implémentation du Dashboard, mode lecture et notifications temps réel

web/src/api/client.ts

@@ -0,0 +1,18 @@
+export const API_BASE = '/api/v1';
+
+export class ApiError extends Error {
+    public status: number;
+    constructor(status: number, message: string) {
+        super(message);
+        this.status = status;
+        this.name = 'ApiError';
+    }
+}
+
+export 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();
+}