test: add Footer component tests (JhaSourav07#798)

## Description

Added unit tests for the `Footer` component.

Fixes JhaSourav07#673

## Pillar

- [x] Other (Bug fix, refactoring, docs)

## Visual Preview

N/A

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
- [x] I have run all tests locally and ensured they pass.
- [x] My commits follow the Conventional Commits format.
- [x] I have only one commit in this PR.

## Changes Made

- Added tests for Footer component rendering
- Verified Documentation link href
- Verified `target="_blank"` behavior
- Verified Contributors link rendering
- Ensured all tests pass successfully with Vitest

Author: JhaSourav07

app/components/Footer.test.tsx

@@ -0,0 +1,41 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { Footer } from './Footer';
+
+describe('Footer Component', () => {
+  it('renders community text', () => {
+    render(<Footer />);
+
+    const text = screen.getByText(/Designed for the elite builder community/i);
+
+    expect(text).toBeTruthy();
+  });
+
+  it('renders Documentation link', () => {
+    render(<Footer />);
+
+    const docLink = screen.getByText(/Documentation/i);
+
+    expect(docLink).toBeTruthy();
+
+    expect(docLink.closest('a')?.getAttribute('href')).toBe(
+      'https://github.com/JhaSourav07/commitpulse/blob/main/README.md'
+    );
+  });
+
+  it('opens documentation in new tab', () => {
+    render(<Footer />);
+
+    const docLink = screen.getByText(/Documentation/i);
+
+    expect(docLink.closest('a')?.getAttribute('target')).toBe('_blank');
+  });
+
+  it('renders Contributors link', () => {
+    render(<Footer />);
+
+    const contributorsLink = screen.getByText(/Contributors/i);
+
+    expect(contributorsLink).toBeTruthy();
+  });
+});