feat: add password visibility toggle to auth forms

[shrey2597]

What does this PR do?

Adds a password visibility toggle (show/hide password) to both Login and Register forms.

Changes made

• Added Eye / EyeOff toggle icons inside password fields.
• Users can switch between hidden and visible password states.
• Added accessibility labels (aria-label) for the toggle button.
• Maintained existing styling and functionality.

Why is this needed?

This improves usability by allowing users to verify their password before submission and reduces typing mistakes during authentication.

Tested

• Login form password visibility toggle works correctly.
• Register form password visibility toggle works correctly.
• No existing authentication functionality was affected.

Closes #29

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[shrey2597]

Hi @Dhanika-Bhat , @yashg2006

I have implemented the password visibility toggle for both Login and Register forms as discussed in Issue #29.

Could you please review the PR when you get a chance? Also, if appropriate, kindly consider adding the issue to GSSoC'26.

Thank you!