Hamburger is added for mobile view

[mehkanarshad]

Description

Adds a responsive mobile hamburger menu to the Dashboard and improves header responsiveness on small screens.
Desktop navigation remains unchanged, while mobile users can now access tabs via a toggleable menu.
Also fixes layout issues caused by long user names overflowing on mobile.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🧹 Code refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test improvement
• 🔧 Build or CI/CD configuration changes

How Has This Been Tested?

• Manually tested on mobile and desktop screen sizes using browser dev tools
• Verified that:
  • Desktop tabs remain visible and unchanged
  • Tabs are hidden on mobile and accessible via the hamburger menu
  • Mobile menu opens/closes correctly
  • Menu closes after selecting a tab
  • Long user names no longer break the header layout

Screenshots

• Mobile view: hamburger menu and responsive header

• Desktop view: existing tab layout (unchanged)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional Information

This change was implemented to align the Dashboard UI with the intended responsive design and improve usability on mobile devices.

Learning Outcomes

Improved understanding of responsive layouts in React using flexbox constraints, Tailwind breakpoints, and handling edge cases such as text overflow on mobile.