📊 Implement Analytics screen

[Smartdevs17]

Problem

Navigation references an Analytics screen that is not implemented.

Context

Users cannot view spending analytics, trends, or insights about their subscriptions.

Proposed Solution

Create Analytics screen with:

1. Monthly spending chart (bar/line chart)
2. Category breakdown (pie chart)
3. Spending trends over time
4. Projections for upcoming renewals
5. Comparison with previous periods

Acceptance Criteria

• Monthly spending visualization renders
• Category breakdown chart displays
• Date range selector works
• Empty state when no subscriptions
• Loading skeleton while calculating

Technical Notes

New File: src/screens/AnalyticsScreen.tsx
Dependencies: react-native-chart-kit or similar
Data: From subscriptionStore

Constraints

• Chart library must support React Native
• Consider data aggregation performance
• Mobile-responsive chart sizing

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[devdianax]

@devdianax has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

can I work on this?

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