- Fix TS2353: Object literal may only specify known properties, and 'paymentMethod' does not exist in type 'Transaction'.
- Fix TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
- Fix TS2741: Property 'getPaymentMethodStats' is missing in type '{ transactions: Transaction[]; budgetData: BudgetData; categoryBudgets: Record<string, number>; selectedTab: BudgetPeriod; setSelectedTab: React.Dispatch<...>; ... 5 more ...; resetBudgetData: () => void; }' but required in type 'BudgetContextType'.