fix(e2e): addStockAdjustment fills qty (step=1) + the new required unit-cost field (#334)

The 4 allocation e2e tests (regressions, sales-fulfillment, sales-management) failed
at addStockAdjustment waiting for '1 adjustment saved' that never appeared. Root
cause (reproduced against an isolated e2e DB): a unit-cost number field was added to
the bulk-adjustment dialog, so the helper's input[type=number].last() now filled
UNIT COST instead of qty — leaving qty empty ('Enter a non-zero quantity'), so the
save never persisted (stock_movements stayed 0). Target the qty field specifically
(step=1) and supply the now-required unit cost for the positive new-product line.

Not a production bug: the stock adjustment flow works; the helper selector was stale.
Verified all 4 previously-failing specs pass locally against an isolated ims_e2e DB.

Co-authored-by: OneTwo3D IMS <dev@onetwo3d.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

e2e/helpers.ts

@@ -127,7 +127,11 @@ export async function addStockAdjustment(page: Page, sku: string, qty: number, w
       }
     }
   }
-  await dialog.locator('input[type="number"]').last().fill(String(qty))
+  // The qty field is step="1"; a separate required unit-cost field (step="any",
+  // title "Unit cost…") was added later, so target qty specifically rather than the
+  // last number input, and supply a unit cost for the positive new-product line.
+  await dialog.locator('input[type="number"][step="1"]').last().fill(String(qty))
+  await dialog.locator('input[title^="Unit cost"]').last().fill('10')
   await dialog.getByRole('button', { name: /save adjustments/i }).click()
 
   await dialog.getByText(/1 adjustment saved\./i).waitFor()