# F-075 — Architect: Inline edit SKU/EAN/STOCK in inventory module; remove Actions column

## Current state

`inventory/page.tsx` has:
- SKU displayed as plain text (no edit capability)
- EAN displayed as plain text (no edit capability)
- Stock inline edit via ✏️ button in the Stock column
- Empty "Acción" column header (th with no corresponding td in tbody — vestigial)

The backend has `PATCH /products/:id/variants/:variantId` which accepts `sku` and `ean` fields. This endpoint is accessible via the admin proxy.

## Goal

1. Make **SKU**, **EAN**, and **Stock** editable inline by clicking on the cell
2. Remove the vestigial "Acción" column (th with no corresponding td)
3. Add `updateVariant` to `productsApi` in the admin API client

## Scope IN

- `project/apps/admin/src/lib/api-client.ts`:
  - Add `updateVariant(productId, variantId, data)` to `productsApi`

- `project/apps/admin/src/app/(dashboard)/inventory/page.tsx`:
  - Extend `VariantRow` interface with `editingSku`, `editSkuValue`, `editingEan`, `editEanValue` states
  - Add `handleSaveSku` and `handleSaveEan` functions calling `productsApi.updateVariant`
  - Make SKU cell: click on text → shows input → save on Enter/blur
  - Make EAN cell: click on text → shows input → save on Enter/blur
  - Stock: click on value (not just ✏️) to enter edit mode
  - Remove the "Acción" column header (th) and its row in the table

## Scope OUT

- No backend changes (endpoint already exists)
- No changes to the product editor (PricingSection, InventorySection)

## Design

SKU cell (click-to-edit):
```tsx
{row.editingSku ? (
  <input
    autoFocus
    value={row.editSkuValue}
    onChange={e => setRows(prev => prev.map(r =>
      r.variant.id === row.variant.id ? { ...r, editSkuValue: e.target.value } : r))}
    onBlur={() => handleSaveSku(row.variant.id, row.productId, row.editSkuValue)}
    onKeyDown={e => { if (e.key === 'Enter') handleSaveSku(...); if (e.key === 'Escape') ...; }}
    className="w-full px-2 py-1 border border-[#2D6A4F] rounded text-xs focus:ring-1 focus:ring-[#2D6A4F]"
  />
) : (
  <button onClick={() => setRows(prev => prev.map(r =>
      r.variant.id === row.variant.id ? { ...r, editingSku: true, editSkuValue: row.variant.sku } : r))}
    className="font-mono text-xs text-gray-600 hover:text-[#2D6A4F] cursor-text text-left w-full truncate"
    title="Clic para editar"
  >
    {row.variant.sku}
  </button>
)}
```

EAN cell: same pattern for EAN.

Stock cell: same pattern, but click on the value (not just ✏️).

## Risk

- **Low risk**: purely frontend changes, no backend or DB changes
- SKU uniqueness validation: backend returns error if duplicate SKU, caught and displayed

## Verification

- `npx tsc --noEmit` admin
- `npx eslint` on changed files
- `./scripts/verify.sh` green
- Manual: click on SKU → edit → save; same for EAN and Stock