feat: improve Lighthouse accessibility and SEO scores (#255)

[srisstii]

This PR improves the application's Lighthouse Accessibility and SEO scores by implementing semantic HTML and accessibility best practices while preserving existing functionality.

Changes made

• Added aria-label to password visibility toggle button
• Replaced generic wrapper with semantic landmark
• Increased touch target size for password visibility button
• Added meta description for improved SEO

Lighthouse Improvements

Accessibility:
79 → 100

SEO:
82 → 91

These changes improve accessibility for screen reader users, enhance semantic HTML, and improve search engine metadata without affecting existing functionality.

Testing

• Verified the login page functions correctly.
• Confirmed password visibility toggle works as expected.
• Re-ran Lighthouse audit after implementing the changes.
• No existing functionality was affected.

Fixes #255

[vercel]

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