feat: add batch-cooking sessions (single "mega recipe" with dish sections)

New AI-generated batch-cooking flow: pick N dinners/lunches + servings,
get one unified recipe covering a full prep session — merged shopping
list, steps tagged per-dish (a step can advance several dishes at once,
e.g. a shared oven bake), and per-dish storage (fridge/freezer) + exact
day-of reheat/finishing instructions.

Schema: recipes.isBatchCook, recipeSteps.appliesTo (dish names), new
recipeBatchDishes table. Batch recipes are excluded from the normal
/recipes list and live under their own /batch-cooking section.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/messages/en.json

@@ -62,6 +62,12 @@
     "ingredients": "Ingredients",
     "instructions": "Instructions",
     "photos": "Photos",
+    "batchCookBadge": "Batch cooking",
+    "batchCookPrep": "Prep",
+    "batchCookDishesTitle": "Dishes & storage",
+    "batchCookFridgeDays": "Fridge: {days}d",
+    "batchCookFreezerFriendly": "Freezer-friendly",
+    "batchCookDayOf": "On the day",
     "servings": "{count} servings",
     "prep": "{mins}m prep",
     "cook": "{mins}m cook",
@@ -535,6 +541,25 @@
     "resendSuccess": "Verification email sent — check your inbox",
     "or": "or"
   },
+  "batchCooking": {
+    "title": "Batch cooking",
+    "subtitle": "Cook once, eat well all week",
+    "empty": "No batch-cooking sessions yet",
+    "newSession": "New batch-cooking session",
+    "dishCount": "{count, plural, one {# dish} other {# dishes}}",
+    "wizardTitle": "Plan a batch-cooking session",
+    "wizardDescription": "Choose how many meals to cover — we'll design a shared shopping list and one prep session for all of them.",
+    "dinners": "Dinners",
+    "lunches": "Lunches",
+    "servingsPerMeal": "Servings per meal",
+    "dietaryPrefs": "Dietary preferences",
+    "dietaryPrefsPlaceholder": "e.g. vegetarian, no shellfish",
+    "anyDifficulty": "Any",
+    "generate": "Generate",
+    "generating": "Generating… this can take a minute",
+    "generateSuccess": "Batch-cooking session created",
+    "generateFailed": "Failed to generate"
+  },
   "recipes": {
     "title": "Recipes",
     "subtitle": "Your personal recipe library",
@@ -543,6 +568,7 @@
     "newSubtitle": "Build your recipe from scratch",
     "importUrl": "Import URL",
     "generate": "Generate",
+    "batchCooking": "Batch cooking",
     "search": "Search recipes…",
     "noRecipes": "No recipes yet",
     "noMatch": "No recipes match",