[Frontend] Add Accessibility tests

[mmtftr]

📌 Implement Testing

🏡 Component

• [x] Frontend

📚 Description

Implement comprehensive accessibility testing across the application to ensure WCAG 2.1 Level A compliance. This includes automated accessibility unit tests

📋 Acceptance Criteria

1. Set up Testing Infrastructure

   • [x] Install and configure testing dependencies (vitest-axe)
   • [x] Set up test utilities for accessibility testing

2. Page Tests

   • [x] Add accessibility tests for all page components:
   • Question page
   • Tag page
   • Profile page
   • Home page
   • Login page
   • Signup page

3. Unit Testing

   • [x] Test keyboard navigation flows
   • [x] Test screen reader compatibility
   • [x] Test focus management
   • [x] Test ARIA attributes and relationships

4. Automated Checks

   • [x] Implement axe-core testing for all pages
   • [x] Add color contrast testing
   • [x] Test heading hierarchy
   • [x] Validate HTML semantics

5. Test Coverage

   • [x] Achieve full page test coverage for accessibility features

📅 Deadline

• Estimated hours of work: 1 hour
• Implementation Deadline: Nov 5
• Review Deadline: Nov 5

👁‍🗨 Reviewer

@NazireAta

🔍 Additional Notes

• Tests should be integrated into the existing test suite
• All new components must include accessibility tests
• CI pipeline should fail if accessibility tests fail

[mmtftr]

Closed by #475