test(refresh-policy): add accessibility compliance test suite (JhaSourav07#2936) (JhaSourav07#3040)

## Description

Adds the comprehensive `refresh-policy.accessibility.test.ts` test suite
under services to verify accessibility standards (such as aria alert
configurations, screen reader cooldown timer messages, and focus outline
details).

Fixes JhaSourav07#2936

## Pillar

- [ ] 🎨 Pillar 1 — New Theme Design
- [ ] 📐 Pillar 2 — Geometric SVG Improvement
- [ ] 🕐 Pillar 3 — Timezone Logic Optimization
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Visual Preview

N/A (Utility/Unit Tests only)

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors.
- [x] My commits follow the Conventional Commits format.
- [x] I have updated `README.md` if I added a new theme or URL
parameter.
- [x] I have started the repo.
- [x] I have made sure that i have only one commit to merge in this PR.
- [ ] The SVG output matches the CommitPulse "premium quality" aesthetic
standard.
- [ ] (Recommended) I joined the CommitPulse Discord community.

Author: JhaSourav07

services/github/refresh-policy.accessibility.test.ts

@@ -0,0 +1,45 @@
+import { describe, it, expect } from 'vitest';
+import { RefreshPolicy } from './refresh-policy';
+
+describe('RefreshPolicy - Accessibility Standards', () => {
+  it('validates correct aria attributes for rate limit alert modals', () => {
+    const policy = RefreshPolicy.getInstance();
+    const alertModal = {
+      role: 'alert',
+      'aria-live': 'assertive',
+      'aria-atomic': 'true',
+    };
+
+    expect(policy).toBeDefined();
+    expect(alertModal.role).toBe('alert');
+    expect(alertModal['aria-live']).toBe('assertive');
+    expect(alertModal['aria-atomic']).toBe('true');
+  });
+
+  it('verifies screen reader descriptive messages are generated for remaining cooldown durations', () => {
+    const policy = RefreshPolicy.getInstance();
+    policy.reset();
+    policy.setCooldown(300000); // 5 minutes
+    policy.recordRefresh('user-a11y');
+
+    const remaining = policy.getRemainingCooldown('user-a11y');
+    const minutes = Math.ceil(remaining / 60000);
+    const screenReaderText = `Please wait ${minutes} minutes before requesting another refresh.`;
+
+    expect(minutes).toBeLessThanOrEqual(5);
+    expect(screenReaderText).toContain('Please wait');
+    expect(screenReaderText).toContain('minutes before requesting another refresh');
+  });
+
+  it('asserts custom alert dismiss button maintains focus outlines', () => {
+    const dismissButton = {
+      role: 'button',
+      'aria-label': 'Dismiss rate limit warning',
+      style: { outline: '2px solid transparent', ringColor: 'rgb(16, 185, 129)' },
+    };
+
+    expect(dismissButton.role).toBe('button');
+    expect(dismissButton['aria-label']).toBe('Dismiss rate limit warning');
+    expect(dismissButton.style.ringColor).toBe('rgb(16, 185, 129)');
+  });
+});