Matthias 4a1cbd105b Add realistic loan amortization with currentBalance back-calculation ...

- Extend schema with effectiveAnnualRate, totalInterest, totalAmount
- Back-calculate paid months from currentBalance and rebuild schedule
- Allow schedule calculation from termMonths without monthlyPayment
- Handle NaN form values gracefully
- Show effective rate, total interest and total amount in UI
- Add amortization unit tests

2026-06-15 20:02:44 +02:00

6.9 KiB

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