🟢 Low: TypeScript strict mode null checks missing on grid data

[EVWorth]

Problem

Despite tsconfig.json having "strict": true, the ResultsGrid uses Record<string, unknown> for row data and performs unchecked type assertions when editing cells. The EditableCell component does manual type checking without exhaustive coverage.

Impact

Type safety gaps in the most data-critical component. Cell editing can silently produce incorrect SQL if type parsing fails.

Affected Files

• src/components/grid/ResultsGrid.tsx
• src/components/grid/EditableCell.tsx

Suggested Fix

Create a discriminated union type for SqlValue and use proper type guards instead of unknown casts. Add runtime validation for parsed cell values.

Severity: Low - TypeScript type safety