Fix func-style lint warning in formatRelativeDate test

Convert the cfg helper from an arrow expression to a function declaration
to match the project's ESLint config.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: myieye

frontend/viewer/src/lib/components/ui/format/format-relative-date.test.ts

@@ -1,46 +1,44 @@
 import {describe, expect, it} from 'vitest';
 import {formatRelativeDate} from './format-relative-date-fn.svelte';
 
-const cfg = (now: Date, smallestUnit: 'milliseconds' | 'seconds' | 'minutes' | 'hours' = 'seconds') => ({
-  defaultValue: 'NEVER',
-  now,
-  smallestUnit,
-});
+function config(now: Date, smallestUnit: 'milliseconds' | 'seconds' | 'minutes' | 'hours' = 'seconds') {
+  return {defaultValue: 'NEVER', now, smallestUnit};
+}
 
 describe('formatRelativeDate', () => {
   it('returns defaultValue for nullish input', () => {
     const now = new Date();
-    expect(formatRelativeDate(null, undefined, cfg(now))).toBe('NEVER');
-    expect(formatRelativeDate(undefined, undefined, cfg(now))).toBe('NEVER');
+    expect(formatRelativeDate(null, undefined, config(now))).toBe('NEVER');
+    expect(formatRelativeDate(undefined, undefined, config(now))).toBe('NEVER');
   });
 
   it('formats a past duration', () => {
     const now = new Date();
-    const result = formatRelativeDate(new Date(now.getTime() - 3000), undefined, cfg(now));
+    const result = formatRelativeDate(new Date(now.getTime() - 3000), undefined, config(now));
     expect(result.startsWith('3 ')).toBe(true);
     expect(result.endsWith(' ago')).toBe(true);
   });
 
   it('formats a future duration', () => {
     const now = new Date();
-    const result = formatRelativeDate(new Date(now.getTime() + 3000), undefined, cfg(now));
+    const result = formatRelativeDate(new Date(now.getTime() + 3000), undefined, config(now));
     expect(result.startsWith('in 3 ')).toBe(true);
   });
 
   it('falls back to a zero-duration string when diff is below smallestUnit', () => {
     const now = new Date();
-    expect(formatRelativeDate(new Date(now.getTime() - 500), undefined, cfg(now))).toMatch(/^0 .+ ago$/);
-    expect(formatRelativeDate(new Date(now.getTime() + 500), undefined, cfg(now))).toMatch(/^in 0 /);
+    expect(formatRelativeDate(new Date(now.getTime() - 500), undefined, config(now))).toMatch(/^0 .+ ago$/);
+    expect(formatRelativeDate(new Date(now.getTime() + 500), undefined, config(now))).toMatch(/^in 0 /);
   });
 
   it('produces the correct plural for zero (style=long)', () => {
     const now = new Date();
-    expect(formatRelativeDate(now, {style: 'long'}, cfg(now))).toContain('0 seconds');
+    expect(formatRelativeDate(now, {style: 'long'}, config(now))).toContain('0 seconds');
   });
 
   it('accepts ISO-string dates', () => {
     const now = new Date();
     const earlier = new Date(now.getTime() - 3000).toISOString();
-    expect(formatRelativeDate(earlier, undefined, cfg(now)).startsWith('3 ')).toBe(true);
+    expect(formatRelativeDate(earlier, undefined, config(now)).startsWith('3 ')).toBe(true);
   });
 });