feat: add sticky sidebar navigation for dashboard sections

[AaryanSingh31]

Summary

Added a sticky sidebar navigation component to the dashboard for quick access to all sections without manual scrolling.

Closes #1519

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Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

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Changes Made

• Created src/components/DashboardSidebar.tsx — sticky sidebar with anchor links to all dashboard sections
• Added section id attributes to all major sections in src/app/dashboard/page.tsx
• Added IntersectionObserver for active section highlighting on scroll
• Added mobile responsive hamburger menu with translucent drawer that closes on item click
• Installed lucide-react for sidebar icons

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How to Test

1. Run npm run dev and navigate to /dashboard
2. Verify sidebar is visible on desktop (lg screens) on the left
3. Click any sidebar item — page should smoothly scroll to that section
4. Scroll manually — active item should highlight automatically
5. On mobile/tablet, verify hamburger button appears
6. Click hamburger — drawer should open with all nav items
7. Click any item — drawer should close and scroll to section

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Screenshots (if UI change)

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Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

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Accessibility Checklist

• Proper keyboard navigation tested
• Responsive UI verified
• Accessibility labels added where needed

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Additional Notes

Sidebar is hidden on mobile and replaced with a slide-in drawer triggered by a hamburger button. lucide-react was added as it was not previously in the project dependencies.

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[Priyanshu-byte-coder]

This PR has merge conflicts with main. Please rebase your branch against the latest main and force-push to resolve. Run: git fetch upstream && git rebase upstream/main

[Priyanshu-byte-coder]

This PR has merge conflicts with the current main branch. Please rebase your branch onto main, resolve the conflicts, and force-push. Once conflicts are resolved and the PR is marked as mergeable it will be reviewed for merging.

[AaryanSingh31]

Okay. I'll work on the conflicts and try to resolve them. Thankyou