fix: address mobile dashboard review findings

packages/widgets/src/system-disks/mobile-summary.spec.ts

@@ -0,0 +1,15 @@
+import { describe, expect, test } from "vitest";
+
+import { formatDiskTemperature } from "./mobile-summary";
+
+describe("formatDiskTemperature", () => {
+  test("preserves a valid zero-degree reading", () => {
+    expect(formatDiskTemperature(0, true)).toBe("0°C");
+  });
+
+  test("omits unavailable or disabled readings", () => {
+    expect(formatDiskTemperature(null, true)).toBeUndefined();
+    expect(formatDiskTemperature(undefined, true)).toBeUndefined();
+    expect(formatDiskTemperature(20, false)).toBeUndefined();
+  });
+});

packages/widgets/src/system-disks/mobile-summary.ts

@@ -0,0 +1,2 @@
+export const formatDiskTemperature = (temperature: number | null | undefined, shouldShow: boolean) =>
+  shouldShow && temperature != null ? `${temperature}°C` : undefined;