Chore/accessibility audit ci

[hashhhh-16]

Summary

This PR introduces automated accessibility auditing using axe-core and Playwright.

Changes Made

• Added @axe-core/playwright as a development dependency.

• Created e2e/accessibility.spec.js to run automated accessibility audits.

• Added accessibility tests for:

  • Homepage (/)
  • 404 / Not Found page

• Configured tests to fail when serious or critical WCAG accessibility violations are detected.

• Added a check to detect Vite error overlays before running accessibility audits, ensuring tests only run against a successfully rendered application.

Benefits

• Enables automated accessibility validation in the existing Playwright test suite.
• Helps catch accessibility regressions early in development.
• Improves overall application quality and WCAG compliance.

Testing

• Executed accessibility tests locally using Playwright.
• Verified axe-core integration and audit execution.
• Confirmed tests correctly detect application rendering failures through Vite error overlay checks.

Note

Current test execution is blocked by existing frontend build issues in FRONTEND/src/components/ui/Navbar.jsx (duplicate imports and syntax errors). The accessibility tests correctly identify the resulting Vite error overlay, indicating that the application must render successfully before accessibility auditing can complete.

closes #470

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[Aamod007]

LGTM