[Folex1275]

Add test coverage for untested components and hooks

This PR adds test coverage for four previously untested areas identified in the Vitest coverage report.

Changes

#922 - DashboardStatsSkeleton tests

• Added __tests__/components/dashboard-stats-skeleton.test.tsx
• Tests verify: expected number of placeholder cards (4), loading animation classes, proper structure, no text content

#923 - Notification polling retention error recovery tests

• Added __tests__/hooks/use-notifications-retention.test.ts
• Tests verify: retention error + getHealth OK → cursor reset to oldestLedger - 1, retention error + getHealth fails → fallback to latest ledger, both fail → cursor unchanged
• Includes test for all retention error message variations

#920 - ConnectWalletButton copy-address tests

• Extended __tests__/components/connect-wallet-button.test.tsx
• Tests verify: copies full address to clipboard, shows confirmation feedback after copying

#921 - AnalyticsCharts render tests

• Added __tests__/components/analytics-charts.test.tsx
• Tests verify: renders with empty snapshot, renders with populated data, ChartTooltip formats values, ChartSkeleton renders placeholders
• Covers token amount formatting, unlock progress calculation, recipient display logic, empty states

All tests follow existing patterns in the codebase using Vitest + Testing Library.

Closes #920
Closes #921
Closes #922
Closes #923

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