i18n(ar): apply review round 3

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/unitLabels.js

@@ -51,3 +51,14 @@ export function formatScaleLabel(label) {
     })}${match[2]}`,
   );
 }
+
+/**
+ * A legend range with its unit: "960 — 1050+ hPa". The unit stays with the
+ * last number. In right-to-left text the unit is isolated as well, so a Latin
+ * unit keeps its own order ("°C", not "C°").
+ */
+export function formatScaleRange(low, high, units) {
+  const unit = unitLabel(units);
+  const range = `${formatScaleLabel(low)} — ${formatScaleLabel(high)}`;
+  return unit ? `${range}\u00a0${isolate(unit)}` : range;
+}