Add group analytics with charts and graphs

[big14way]

Create visual analytics for group contribution and payout history.

Acceptance Criteria:

• Add chart library (recharts or chart.js)
• Contribution amount over time line chart
• Payout distribution bar chart
• Member participation pie chart
• Responsive charts that work on mobile

Files: new file src/components/GroupAnalytics.tsx, src/app/groups/[id]/page.tsx, package.json

[opensecretsauce]

@algora-pbc attempt — adding group analytics with charts. PR incoming.

[MCH-Strategies]

/attempt #69

Claiming this bounty to add group analytics with charts and graphs, focusing on implementing real-time data visualization for better insights.

[MCH-Strategies]

/attempt #69

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