feat(ui/alerts): silence + notification query hooks

ui/src/api/queries/alertSilences.test.tsx

@@ -0,0 +1,39 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import type { ReactNode } from 'react';
+import { useEnvironmentStore } from '../environment-store';
+
+vi.mock('../client', () => ({
+  api: { GET: vi.fn(), POST: vi.fn(), PUT: vi.fn(), DELETE: vi.fn() },
+}));
+
+import { api as apiClient } from '../client';
+import { useAlertSilences } from './alertSilences';
+
+function wrapper({ children }: { children: ReactNode }) {
+  const qc = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+  return <QueryClientProvider client={qc}>{children}</QueryClientProvider>;
+}
+
+describe('useAlertSilences', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    useEnvironmentStore.setState({ environment: 'dev' });
+  });
+
+  it('fetches silences for selected env', async () => {
+    (apiClient.GET as any).mockResolvedValue({ data: [], error: null });
+    const { result } = renderHook(() => useAlertSilences(), { wrapper });
+    await waitFor(() => expect(result.current.isSuccess).toBe(true));
+    expect(apiClient.GET).toHaveBeenCalledWith(
+      '/environments/{envSlug}/alerts/silences',
+      { params: { path: { envSlug: 'dev' } } },
+    );
+  });
+});