test(commitpulse-logo-accessibility): add accessibility coverage (JhaSourav07#3303)

## Description

Fixes JhaSourav07#2666 
## Summary

Added a dedicated accessibility-focused test suite for
`CommitPulseLogo`.

The tests verify:

* SVG logo rendering
* `aria-hidden` accessibility behavior
* custom `className` application
* SVG path rendering structure
* accessibility-safe SVG presentation attributes

## Changes Made

* Created `components/commitpulse-logo.accessibility.test.tsx`
* Added 5 focused Vitest test cases for SVG accessibility behavior

## Validation

```bash
npx vitest components/commitpulse-logo.accessibility.test.tsx
npm run lint
npm run format
```

## Pillar

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

## Visual Preview

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally
(`localhost:3000/api/streak?user=YOUR_USERNAME`).
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors (CI will fail otherwise).
- [x] My commits follow the Conventional Commits format (e.g.,
`feat(themes): ...`, `fix(calculate): ...`).
- [ ] 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.
- [x] The SVG output matches the CommitPulse "premium quality" aesthetic
standard (no raw elements, smooth animations, correct fonts).
- [x] (Recommended) I joined the CommitPulse Discord community for
contributor discussions, mentorship, and faster PR support.

Author: JhaSourav07

components/commitpulse-logo.accessibility.test.tsx

@@ -0,0 +1,49 @@
+import { render } from '@testing-library/react';
+import { describe, expect, it } from 'vitest';
+
+import { CommitPulseLogo } from './commitpulse-logo';
+
+describe('CommitPulseLogo accessibility', () => {
+  it('renders the SVG logo correctly', () => {
+    const { container } = render(<CommitPulseLogo />);
+
+    const svg = container.querySelector('svg');
+
+    expect(svg).toBeTruthy();
+  });
+
+  it('marks the SVG as aria-hidden for screen readers', () => {
+    const { container } = render(<CommitPulseLogo />);
+
+    const svg = container.querySelector('svg');
+
+    expect(svg?.getAttribute('aria-hidden')).toBe('true');
+  });
+
+  it('applies custom class names correctly', () => {
+    const { container } = render(<CommitPulseLogo className="h-10 w-10 text-cyan-400" />);
+
+    const svg = container.querySelector('svg');
+
+    expect(svg?.getAttribute('class')).toContain('h-10');
+    expect(svg?.getAttribute('class')).toContain('w-10');
+    expect(svg?.getAttribute('class')).toContain('text-cyan-400');
+  });
+
+  it('renders SVG paths for logo structure', () => {
+    const { container } = render(<CommitPulseLogo />);
+
+    const paths = container.querySelectorAll('path');
+
+    expect(paths.length).toBe(4);
+  });
+
+  it('uses accessibility-safe SVG presentation attributes', () => {
+    const { container } = render(<CommitPulseLogo />);
+
+    const svg = container.querySelector('svg');
+
+    expect(svg?.getAttribute('fill')).toBe('none');
+    expect(svg?.getAttribute('stroke')).toBe('currentColor');
+  });
+});