3c-fix: partial consumption now deducts eaten + leftovers

- consumptionPortions = min(planned, actualPortionsEaten + leftoverEstimatePortions).
  Meal boxes are a subset of leftovers; raw inventory is only retained for
  portions that were never cooked.
- Added validation leftoverEstimatePortions >= mealBoxPortions with localized
  400 error (cooked.leftoverLessThanBox) in server i18n + all 12 locales.
- Removed unused COOKING_SESSION_STATUSES / MEAL_BOX_STATUSES imports from
  apps/api/src/lib/cooking.ts.
- Hardened test cleanup to delete mealBoxes/meals/recipeCooks/cookingSessions
  by household before dropping storageLocations.
- New regression tests: meal-box double-counting, eaten+leftover split, and
  leftover < box rejection.
- Updated FAS3-COOKING-SESSIONS-AUDIT.md with corrected physics semantics.

apps/api/src/lib/cooking.ts

@@ -9,11 +9,7 @@ import {
 } from "@app/inventory-engine";
 import { scaleNutrition } from "@app/nutrition-engine";
 import type { Unit } from "@app/shared-types";
-import {
-  COOKING_SESSION_STATUSES,
-  MEAL_BOX_STATUSES,
-  MEAL_TYPES,
-} from "@app/shared-types";
+import { MEAL_TYPES } from "@app/shared-types";
 import {
   cookingSessionStarted,
   cookingSessionCompleted,
@@ -76,6 +72,11 @@ export async function completeCookingSession(
     throw errors.badRequest(t("cooked.portionsSumExceedsPlanned", languageTag));
   }
 
+  if (leftoverEstimatePortions < mealBoxPortions) {
+    const languageTag = await userLanguageTag(app.db, userId);
+    throw errors.badRequest(t("cooked.leftoverLessThanBox", languageTag));
+  }
+
   if (options.emitStartedEvent && session.status === "started") {
     await trackProductAnalytics(
       app.db,
@@ -204,10 +205,15 @@ export async function completeCookingSessionCore(
   // 1. FEFO-avdrag
   const deductions: Array<{ itemId: string; quantity: number; unit: string; name: string }> = [];
   if (input.deductInventory !== false) {
-    // Partiell förbrukning (Fas 3 §6.3): om actualPortionsEaten anges drar vi
-    // endast råvaror för de faktiskt ätna portionerna. Rester/överskott stannar
-    // kvar som råvara i lagret tills de förbrukas på annat sätt.
-    const consumptionPortions = input.actualPortionsEaten ?? portionsCooked;
+    // Partiell förbrukning (Fas 3 §6.3): råvaror dras för de tillagade
+    // portionerna = ätna + rester (inklusive matlådor). Endast portioner som
+    // aldrig tillagats stannar kvar som råvara i lagret.
+    const actualPortionsEaten = input.actualPortionsEaten ?? portionsCooked;
+    const leftoverEstimatePortions = input.leftoverEstimatePortions ?? 0;
+    const consumptionPortions = Math.min(
+      portionsCooked,
+      actualPortionsEaten + leftoverEstimatePortions,
+    );
     const factor = consumptionPortions / recipe.portions;
     const overrides = new Map(input.inventoryOverrides?.map((o) => [o.canonicalIngredientId, o]) ?? []);