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Computation UI files

Column drafts, input controls and display helpers. The benefit formula belongs in programs/snap-negative/calculation.ts.

System explanation · Choosing checks

Source files

File	Responsibility / entry points
`src/features/reviews/computation-controls.tsx`	Money, integer, boolean and deduction controls with calculation-result cells. ComputationDiffsContext, ResultCell, InputRows
`src/features/reviews/computation-discrepancies.ts`	Calculates isolated input differences and ranks up to six benefit effects. buildDiscrepancies
`src/features/reviews/computation-final-error.tsx`	Signed benefit-error display and threshold/stale-Final handling. finalErrorDisplay, ComputationErrorRow
`src/features/reviews/computation-grid.helpers.ts`	Scenario/draft selection and synchronization, money formatting, income alignment and result rows. EditableScenarioId, ColumnId, DraftMap, EDITABLE_SCENARIO_IDS, parseDollarsToCents, formatDecimal2FromCents …
`src/features/reviews/computation-grid.tsx`	Four-column grid, optional split columns and Save/Reset/Apply controls. ComputationGridProps, ComputationGrid
`src/features/reviews/computation-income.tsx`	Income row rendering, add/edit popovers and draft changes. AddIncomeButton, IncomeRow
`src/features/reviews/income-validation.ts`	Field-level income validation used before confirming grid input. IncomeField, incomeFieldErrors
`src/features/reviews/money-input.tsx`	Reusable controlled money input with parse/reject behavior. MoneyInput

Tests

File	Responsibility / entry points
`src/features/reviews/computation-discrepancies.test.ts`	Checks computation discrepancies. Example: “result row includes every calculated column and leaves empty or stale columns blank”.
`src/features/reviews/computation-grid.helpers.test.ts`	Checks computation grid.helpers. Example: “only populated computation columns calculate, including populated zero-income cases”.
`src/features/reviews/income-validation.test.ts`	Checks income validation. Example: “income errors identify missing type, stale member and malformed amounts together”.