Compute analytics timeframe dynamically

resources/js/admin/mobile/__tests__/analytics.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { resolveMaxCount } from '../lib/analytics';
+import { resolveMaxCount, resolveTimelineHours } from '../lib/analytics';
 
 describe('resolveMaxCount', () => {
   it('defaults to 1 for empty input', () => {
@@ -14,3 +14,20 @@ describe('resolveMaxCount', () => {
     expect(resolveMaxCount([0])).toBe(1);
   });
 });
+
+describe('resolveTimelineHours', () => {
+  it('uses fallback when data is missing', () => {
+    expect(resolveTimelineHours([], 12)).toBe(12);
+  });
+
+  it('calculates rounded hours from timestamps', () => {
+    const start = new Date('2024-01-01T10:00:00Z').toISOString();
+    const end = new Date('2024-01-01T21:00:00Z').toISOString();
+    expect(resolveTimelineHours([start, end], 12)).toBe(11);
+  });
+
+  it('never returns less than 1', () => {
+    const start = new Date('2024-01-01T10:00:00Z').toISOString();
+    expect(resolveTimelineHours([start, start], 12)).toBe(1);
+  });
+});