feat(cursor): add custom animated cursor for landing page

[nishupr]

Fix #1162

Summary

Adds a custom animated cursor to the DevTrack landing page, replacing the default browser cursor with a purple/indigo themed one that matches the site's aesthetic.

Changes

• Added src/components/CustomCursor.tsx — self-contained cursor component
• Imported and rendered <CustomCursor /> in src/app/layout.tsx

Behavior

• Inner dot — snaps instantly to pointer with a purple radial glow
• Outer ring — trails behind the dot with a smooth lerp animation
• Hover state — ring expands and fills with a faint purple tint when over buttons, links, and other interactive elements
• Click state — dot shrinks and ring pulses on mousedown
• Touch safe — detects pointer: coarse and disables itself on touch devices, native cursor is restored
• No dependencies — pure React hooks + inline styles, no extra packages needed

Testing

• Cursor visible on landing page
• Ring expands on button/link hover
• Dot shrinks on click
• Native cursor hidden
• No layout shift or performance issues
• npm run lint && npm run type-check passed

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[github-actions]

GSSoC Label Checklist 🏷️

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Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

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• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

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Points formula: (difficulty × quality_multiplier) + type_bonus