Story 2.1: Édition de Cellule & Validation

Status: review

Story

As a Julien (Analyst), I want to edit cell values directly in the grid, so that I can manually correct obvious data entry errors.

Inline Editing: Double-clicking a cell enters "Edit Mode" with an input field matching the column type.
Data Validation: Input is validated against the column type (e.g., only numbers in Numeric columns).
Commit Changes: Pressing Enter or clicking outside saves the change to the local Zustand store.
Visual Feedback: Edited cells are temporarily highlighted or marked to indicate unsaved/modified state.
Keyboard Support: Pressing Esc cancels the edit and restores the original value.

Frontend Grid Update (AC: 1, 3, 5)
- Implement EditableCell component in src/features/smart-grid/components/SmartGrid.tsx.
- Add onCellEdit logic to the TanStack Table configuration.
State Management (AC: 3, 4)
- Update useGridStore to support a updateCellValue(rowId, colId, value) action.
- Implement a modifiedCells tracking object in the store to highlight changes.
Validation Logic (AC: 2)
- Add regex-based validation for numeric and boolean inputs in the frontend.

Memoization: Used local state for editing to prevent entire table re-renders during typing.
Visuals: Modified cells now have a subtle bg-amber-50 background.
Validation: Implemented strict numeric validation before committing to the global store.