fix: address mobile dashboard review findings

packages/widgets/src/weather/temperature.spec.ts

@@ -0,0 +1,20 @@
+import { describe, expect, test } from "vitest";
+
+import { getPreferredUnit } from "./temperature";
+
+describe("getPreferredUnit", () => {
+  test("preserves zero in Celsius and Fahrenheit", () => {
+    expect(getPreferredUnit(0)).toBe("0.0°C");
+    expect(getPreferredUnit(0, true)).toBe("32.0°F");
+  });
+
+  test("only uses the unavailable placeholder for missing values", () => {
+    expect(getPreferredUnit(undefined)).toBe("?");
+  });
+
+  test("respects the decimal preference", () => {
+    expect(getPreferredUnit(0, false, true)).toBe("0°C");
+    expect(getPreferredUnit(0, true, true)).toBe("32°F");
+    expect(getPreferredUnit(12.6, false, true)).toBe("13°C");
+  });
+});

packages/widgets/src/weather/temperature.ts

@@ -0,0 +1,6 @@
+export const getPreferredUnit = (value?: number, isFahrenheit = false, disableTemperatureDecimals = false): string =>
+  value !== undefined
+    ? isFahrenheit
+      ? `${(value * (9 / 5) + 32).toFixed(disableTemperatureDecimals ? 0 : 1)}°F`
+      : `${value.toFixed(disableTemperatureDecimals ? 0 : 1)}°C`
+    : "?";