fix dark mode layout and LoginPopup styles and structure for improved…

[rjeetgupta]

Which issue does this PR close?

Closes #179

Rationale for this change

The login/signup form had several UI/UX issues affecting readability and consistency in dark mode. Additionally, duplicate login/register buttons and inconsistent spacing were impacting the overall user experience. This PR resolves these problems to improve responsiveness, maintain design consistency, and provide a cleaner interface.

What changes are included in this PR?

• Fixed dark mode support for the login/signup form
• Removed unnecessary duplicate login/register button rendering
• Adjusted spacing for better layout and readability

Are these changes tested?

[x] Verified in dark mode and light mode
[x] Checked responsiveness across different screen sizes
[x] Confirmed buttons and form functionality work as expected

Are there any user-facing changes?

Yes.

• Users will now see proper dark mode styling on the login/signup form.
• Only one login/register button is displayed.
• Layout spacing has been fixed, improving overall readability.

Screenshots (if applicable)

[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. 🙌🏼

[Skrishna0703]

[rjeetgupta]

Hi @Skrishna0703,
In the last pull request you merged, there were some changes to the login made by another user, and I got a conflict error. I will resolve it, but the merged PR also changed the style of the login and register pages. Should I keep the style changes I already made, or just resolve the merge conflict and push again? I am attaching a screenshot so you can see the changes made by the other user.