Clamp ICO image size to 256x256 to prevent exceeding format limits.

src/lib/workers/magick.ts

@@ -293,17 +293,31 @@ const magickConvert = async (
 	let fmt = to.slice(1).toUpperCase();
 	if (fmt === "JFIF") fmt = "JPEG";
 
+	// ✅ ICO size clamp to avoid WidthOrHeightExceedsLimit
+	if (fmt === "ICO") {
+		const max = 256;
+		const w = img.width;
+		const h = img.height;
+
+		if (w > max || h > max) {
+			const scale = max / Math.max(w, h);
+			const newW = Math.max(1, Math.round(w * scale));
+			const newH = Math.max(1, Math.round(h * scale));
+
+			img.resize(newW, newH);
+		}
+	}
+
 	const result = await new Promise<Uint8Array>((resolve, reject) => {
 		try {
-			// magick-wasm automatically clamps (https://github.com/dlemstra/magick-wasm/blob/76fc6f2b0c0497d2ddc251bbf6174b4dc92ac3ea/src/magick-image.ts#L2480)
 			if (compression) img.quality = compression;
 			if (!keepMetadata) img.strip();
 
 			img.write(fmt as unknown as MagickFormat, (o: Uint8Array) => {
 				resolve(structuredClone(o));
 			});
-		} catch (error) {
-			reject(error);
+		} catch (e) {
+			reject(e);
 		}
 	});