[Enhancement] Dashboard UI/UX Improvements

[AvaneeshKesavan]

• Fixes : [Enhancement] Dashboard UI/UX Improvements #125

Description:

• Improved responsiveness of dashboard cards and sections for mobile and tablet views.
• Ensured uniform spacing, alignment, and sizing across all dashboard components.
• Updated profile cards, platform links, streak, and heatmap to sync with backend in real-time.
• Integrated shadcn UI components for better interactivity and consistent design system.
• Optimized text and image scaling to maintain visual hierarchy and readability.

Notes for Reviewer:

• Tested on both desktop and mobile devices.
• Real-time updates for streak and heatmap verified with backend API.

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[github-actions]

🙌 Thanks @AvaneeshKesavan for raising this PR!
Our team will review it soon ⏳ — meanwhile, please make sure your PR follows our contributing guidelines 👉 Contributing Guidelines 🎉

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #179 has been merged! 🎉🎉