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feat: Update package.json to v3.1

v2.2: Fly-to animations, custom emoji icons, mobile bottom-sheet, Recharts analytics, Fuse.js search, debounced viewport, server-side clusters

v2.1: Server-side clustering, floating stats cards, enhanced sidebar UX, EntityDetail + AnalyticsPanel, optimized spatial indexing

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v2.0: Bharat Tech Atlas — heatmaps, advanced filters, enriched profiles, 1200+ entities

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