fix: Resolve client-side TODOs

[slimatic]

Summary

• ReportGenerator: Add totalLiabilities parameter to generateHawlStatement() and calculate net worth properly
• useMigration: Import actual PaymentEncryptionService instead of stub function
• NisabYearRecordsPage: Pass liability total to PDF generator

Changes

1. ReportGenerator.ts:

   • Added totalLiabilities parameter (default 0)
   • Calculate totalAssets from assets array
   • Calculate netWorth = totalAssets - totalLiabilities
   • Display liabilities and net worth in both Summary and Financials sections

2. useMigration.ts:

   • Replace stub with actual PaymentEncryptionService.encryptPaymentData()

3. NisabYearRecordsPage.tsx:

   • Calculate total liabilities from allLiabilities
   • Pass to PDF generator

Not Included (skipped)

• useZakatSnapshots comparison logic - needs API design work
• calendarConverter test functions - new feature implementation, not just TODOs

Testing

• TypeScript compiles without errors
• Changes are backward compatible (optional parameter with default)