## Summary
- Adds loan detail tracking (interest rate, term, start date, original
amount) to loan-type accounts, following the existing
`real_estate_details` pattern
- Implements `LoanAmortizationService` with standard amortization math
to automatically project month-to-month balance evolution
- Shows projected future balances as a dashed line on the account
balance chart, visually distinct from historical data
- Adds a scheduled command (`loans:generate-balances`) to auto-generate
monthly balance entries for loan accounts
- Includes 36 tests (10 unit for pure math, 26 feature for CRUD, API
projections, command, and authorization)
## Changes
### Backend
- **Migration**: `loan_details` table (UUID PK, unique `account_id` FK,
interest rate, term, start date, original amount)
- **LoanDetail model** + factory with `Account::loanDetail()` HasOne
relationship
- **LoanAmortizationService**: `calculateMonthlyPayment`,
`calculateRemainingBalance`, `generateProjection`, `projectFromBalance`,
`calculateRemainingMonths`, `getBalanceAtDate`
- **GenerateMonthlyLoanBalances** command: runs monthly on 1st, skips
existing entries
- **LoanDetailController**: PATCH endpoint for editing loan details from
show page
- **Settings\AccountController**: creates/updates `LoanDetail` on
store/update
- **DashboardAnalyticsController**: appends projected data points with
`projected: true` flag
- **Validation**: loan-specific rules in StoreAccountRequest and
UpdateAccountRequest
### Frontend
- **AccountForm**: loan fields (rate, term, start date, original amount)
shown when `type === 'loan'`
- **Create/Edit dialogs**: pass loan data fields in POST/PATCH payloads
- **Show page**: `LoanDetailsCard` component with edit/read modes,
computed monthly payment and remaining months
- **Balance chart**: new `ComposedChart` branch with dashed `Line`
overlay for projected data points
- **Types**: `LoanDetail` interface in `account.ts`
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