feat(frontend): Build interactive analytics dashboard with charts

[KuchiMercy]

Description

Admin /admin/analytics page is a stub. Build full analytics dashboard with interactive charts.

Backend: B-17 (analytics service) | Library: Recharts (add as dependency)

Acceptance Criteria

• Install and configure Recharts
• Escrow Volume Over Time: line chart (7d, 30d, 90d, 1y)
• Status Distribution: pie/donut chart
• Average Resolution Time: bar chart (weekly)
• User Growth: area chart
• Dispute Rate Trend: line chart
• Summary stats header: Total Volume, Active Escrows, Completion Rate, Dispute Rate, Active Users
• Date range selector filtering all charts
• Interactive: hover tooltips with exact values
• Export to PNG per chart
• Auto-refresh every 5 minutes with manual refresh button
• Loading skeletons per chart
• Empty data state
• Responsive: stack mobile, 2-col tablet, 3-col desktop
• Admin-only route enforcement
• Playwright E2E test

Points: 200

[Itzzyee47]

@Itzzyee47 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this feature

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Itzzyee47 to this issue.

[GauravKarakoti]

@GauravKarakoti has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Allow me to work on this one

ℹ️ Repo Maintainers: To accept this application, review their application or assign @GauravKarakoti to this issue.

[legend-esc]

@legend-esc has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign me I can work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @legend-esc to this issue.

[nikkybel]

@nikkybel has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please can I be assign this issue to tackle?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @nikkybel to this issue.