update kpi mortality card to change color based on the status

utils/__tests__/mortality.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, it } from 'vitest';
+import { getDailyMortalityPct, getDailyMortalityStatus } from '../mortality.ts';
+
+describe('getDailyMortalityPct', () => {
+  it('returns null when values are missing or invalid', () => {
+    expect(getDailyMortalityPct(null, 10000)).toBeNull();
+    expect(getDailyMortalityPct(undefined, 10000)).toBeNull();
+    expect(getDailyMortalityPct(10, null)).toBeNull();
+    expect(getDailyMortalityPct(10, 0)).toBeNull();
+    expect(getDailyMortalityPct(10, -100)).toBeNull();
+  });
+
+  it('calculates correct percentage', () => {
+    expect(getDailyMortalityPct(5, 10000)).toBe(0.05);
+    expect(getDailyMortalityPct(10, 10000)).toBe(0.1);
+  });
+});
+
+describe('getDailyMortalityStatus', () => {
+  it('returns na when mortalityToday is null or undefined', () => {
+    expect(getDailyMortalityStatus(null, 10000)).toBe('na');
+    expect(getDailyMortalityStatus(undefined, 10000)).toBe('na');
+  });
+
+  it('returns ok when docInCount is null or 0', () => {
+    expect(getDailyMortalityStatus(5, null)).toBe('ok');
+    expect(getDailyMortalityStatus(5, 0)).toBe('ok');
+  });
+
+  it('returns ok when daily mortality <= 0.05%', () => {
+    // 0 out of 10,000 = 0%
+    expect(getDailyMortalityStatus(0, 10000)).toBe('ok');
+    // 5 out of 10,000 = 0.05%
+    expect(getDailyMortalityStatus(5, 10000)).toBe('ok');
+    // 10 out of 20,000 = 0.05%
+    expect(getDailyMortalityStatus(10, 20000)).toBe('ok');
+  });
+
+  it('returns warning when daily mortality > 0.05% and < 0.10%', () => {
+    // 6 out of 10,000 = 0.06%
+    expect(getDailyMortalityStatus(6, 10000)).toBe('warning');
+    // 9 out of 10,000 = 0.09%
+    expect(getDailyMortalityStatus(9, 10000)).toBe('warning');
+  });
+
+  it('returns critical when daily mortality >= 0.10%', () => {
+    // 10 out of 10,000 = 0.10%
+    expect(getDailyMortalityStatus(10, 10000)).toBe('critical');
+    // 25 out of 10,000 = 0.25%
+    expect(getDailyMortalityStatus(25, 10000)).toBe('critical');
+  });
+});