Build gist type distribution by urban vs rural

[BigBen-7]

Description

Compare gist content patterns between urban and rural locations.

Requirements

• Urban vs rural cell classification
• Content type distribution comparison
• Engagement rate comparison
• Language distribution by zone
• Actionable insights per zone

Files to Touch

• analytics/components/charts/UrbanRuralComparison.tsx
• analytics/lib/urban-rural-classifier.ts

Complexity: 200 points