Fetch SPC convective outlook data

internal/cli/root_test.go

@@ -996,6 +996,8 @@ func dailyServer(t *testing.T) *httptest.Server {
 			_, _ = w.Write([]byte(`{"data":{"product":"discussion","issuedAt":"2026-05-29T09:25:00-05:00","keyMessages":["Storms are most likely during the morning."]}}`))
 		case "/weatherstories/latest":
 			_, _ = w.Write([]byte(`{"data":{"officeId":"LSX","startTime":"2026-05-30T08:46:00Z","endTime":"2026-05-31T11:00:00Z","updatedAt":"2026-05-30T09:00:34Z","title":"Several Chances for Rain Through Monday","description":"Scattered showers and thunderstorms remain possible.","altText":"Forecast weather story graphic.","priority":false,"order":1,"downloadUrl":"https://api.weather.gov/offices/LSX/weatherstories/download/test"}}`))
+		case "/outlooks/convective":
+			_, _ = w.Write([]byte(`{"data":{"asOf":"2026-05-29T16:00:00Z","outlooks":[],"discussions":[]}}`))
 		default:
 			http.NotFound(w, r)
 		}