strip more seamless and margin improvements

src/lib/services/weather.ts

@@ -273,6 +273,65 @@ export interface EnsembleForecastResult {
 	hourlyUnitsFlat: Record<string, string>;
 }
 
+// ─── Error Humanizing ───────────────────────────────────────────────────────────
+
+export interface FriendlyWeatherError {
+	/** Short, plain-language headline. */
+	title: string;
+	/** What the user can actually do about it. */
+	hint?: string;
+	/** The raw underlying message, for a collapsed "technical details" block. */
+	detail?: string;
+}
+
+/**
+ * Turns a fetch/API error into something a person can act on. The raw message
+ * (often API-speak like "No data is available for this location") is kept as
+ * `detail` so it can be shown collapsed.
+ */
+export function humanizeWeatherError(err: unknown): FriendlyWeatherError {
+	const raw = err instanceof Error ? err.message : String(err);
+	const msg = raw.toLowerCase();
+
+	if (
+		err instanceof TypeError ||
+		msg.includes('failed to fetch') ||
+		msg.includes('networkerror') ||
+		msg.includes('load failed') ||
+		msg.includes('network request failed')
+	) {
+		return {
+			title: "Couldn't reach the weather service",
+			hint: 'Check your internet connection and try again.',
+			detail: raw
+		};
+	}
+	if (
+		msg.includes('no data is available') ||
+		msg.includes('not available for this location') ||
+		msg.includes('out of allowed range') ||
+		msg.includes('coordinates')
+	) {
+		return {
+			title: 'No data for this location with the selected model',
+			hint: 'Regional weather models only cover their own area — "Best match" picks a suitable model automatically.',
+			detail: raw
+		};
+	}
+	if (msg.includes('invalid') || msg.includes('cannot be') || msg.includes('bad request')) {
+		return {
+			title: 'The weather service rejected the request',
+			hint: 'Try different settings, or switch the model back to "Best match".',
+			detail: raw
+		};
+	}
+	return {
+		title: 'Loading the weather data failed',
+		hint: 'Try again in a moment. If it keeps happening, switch the model to "Best match".',
+		detail: raw
+	};
+}
+
 // ─── Week Forecast Fetch ────────────────────────────────────────────────────────
 
 // Fallback set when the caller does not specify which hourly variables it