fix: resolve cart visibility issue

[AradhyaRay05]

Which issue does this PR close?

• Closes [Bug]: Cart sidebar is not fully visible within the screen viewport #1862

Rationale for this change

The cart panel in the marketplace page was not fully visible on smaller screen sizes due to layout overflow issues. This affected usability on mobile devices and smaller viewports, making parts of the cart inaccessible to users. This change improves responsiveness and ensures the cart remains fully visible within the viewport.

What changes are included in this PR?

• Fixed cart visibility issue on mobile devices
• Updated cart layout styling to prevent overflow outside the screen
• Improved responsiveness for smaller viewport widths
• Modified marketplace.html to ensure proper cart rendering across devices
• Added before/after screenshots for visual verification

Are these changes tested?

Yes.

• Tested locally using http://localhost:3000
• Verified the fix using browser developer tools
• Tested responsiveness on multiple viewport sizes (320px, 375px, 768px)
• Confirmed the cart remains visible and usable without overflow issues

Are there any user-facing changes?

Yes.

Before: The cart panel overflowed or appeared partially hidden on smaller screens, affecting usability.

After: The cart now stays fully visible and properly aligned within the viewport on mobile and smaller devices, improving accessibility and user experience.

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[github-actions]

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