fix: add show/hide password toggle to login modal

[RudraMalvankar]

Related Issue

Closes #1063

Summary

Added a show/hide password toggle to the login modal, allowing users to verify their password before submitting the form and improving the overall login experience.

Changes Made

• Added a password visibility toggle button (👁️) next to the password field.
• Implemented JavaScript logic to switch between password and text input types.
• Updated the toggle icon dynamically based on the current visibility state.
• Preserved existing password validation and authentication functionality.

Testing

• Verified that the password is hidden by default.
• Verified that clicking the toggle button reveals the password.
• Verified that clicking the toggle button again hides the password.
• Confirmed that login and signup validation continue to work as expected.
• Tested locally in the browser.

Screenshots

Before:

• Password field did not provide any way to view entered text.

After:

• Password field includes a visibility toggle button.
• Users can switch between hidden and visible password states.

Checklist

• Code follows project style
• Tested locally
• No unrelated changes included
• Documentation updated (if applicable)