fix: keep daily brief independent from warning checks

lib/server-warnings.ts

@@ -2,14 +2,18 @@ import { normalizeWarning } from "@/lib/weather-utils";
 import type { RawWarning, WeatherWarning } from "@/types/imgw";
 
 const IMGW_WARNINGS_METEO_URL = "https://danepubliczne.imgw.pl/api/data/warningsmeteo";
+const USER_AGENT = "wtr./1.0 (weather notification worker)";
 
 export async function fetchMeteoWarnings(signal?: AbortSignal): Promise<WeatherWarning[]> {
   const response = await fetch(IMGW_WARNINGS_METEO_URL, {
-    headers: { accept: "application/json" },
+    headers: { accept: "application/json", "user-agent": USER_AGENT },
     next: { revalidate: 300 },
     signal,
   });
-  if (!response.ok) throw new Error("Unable to load IMGW meteorological warnings.");
+  if (!response.ok) {
+    const details = await response.text().catch(() => "");
+    throw new Error(`Unable to load IMGW meteorological warnings: ${response.status}${details ? ` ${details.slice(0, 240)}` : ""}`);
+  }
   const rows = await response.json() as RawWarning[];
   return Array.isArray(rows) ? rows.map((warning, index) => normalizeWarning(warning, "meteo", index)) : [];
 }