fix(ui): Ensure footer consistency and fix dark mode style

[UjjwalTomar0808]

Description

This pull request resolves UI inconsistencies and styling bugs in the website's footer.
The primary changes include:

1. Fixing Dark Mode CSS: A CSS rule has been added to all relevant stylesheets to correct a bug where the underlines for the footer section titles ("Quick Links," "Features," etc.) were invisible in dark mode due to low contrast. The underlines are now a light color, ensuring they are visible.
   These changes create a consistent and polished user experience across the entire site.

Closes #749

Type of change

• [✅] Bug fix
• New feature
• Improvement
• Documentation update

How Has This Been Tested?

The fix has been verified manually across multiple pages and in both light and dark modes.

1. Loaded the convert.html page and confirmed its footer now correctly displays the three badges and matches the layout of the footer on index.html.
2. Enabled dark mode.
3. Navigated to several different pages (including index.html, convert.html, and about.html) and inspected the footer on each.
4. Confirmed that the underlines for the footer titles are now a light color and clearly visible on all pages in dark mode.
   The footer is now visually consistent and correctly styled across the site.

Checklist:

• [✅] My code follows the style guidelines of this project
• [✅] I have performed a self-review of my code
• [✅] I have commented my code where necessary
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation

Screenshots

[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. 🙌🏼

[supriya46788]

remove .ds_store file

[supriya46788]

sorry for not merging your pr, because this issue is resolved now