refactor: fold batch-cooking into the main recipes list and Generate dialog

Batch-cook recipes no longer live in a separate /batch-cooking section:
- Removed the dedicated page/route and its nav button.
- /recipes shows both kinds together, with a chef-hat badge marking
  batch sessions, and a filter to isolate/hide them.
- "Batch cooking" is now a third tab in the existing "Generate recipe
  with AI" dialog (alongside Describe/Photo) instead of a separate
  button — one AI entry point instead of three.
- Extracted the counters/difficulty/dietary form into BatchCookFields,
  shared between that dialog and the meal-planner's batch-cooking
  dialog.
- Also fixed a dialog resize issue (progress bar mounting mid-generate
  grew the dialog's height, which the positioning library didn't
  always handle) by reserving space up front and capping dialog height
  with a scroll fallback.

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

apps/web/messages/fr.json

@@ -583,6 +583,9 @@
     "visibilityLabel": "Visibilité",
     "difficultyLabel": "Difficulté",
     "tagLabel": "Tag",
+    "batchCookLabel": "Batch cooking",
+    "batchCookOnly": "Batch cooking uniquement",
+    "batchCookExclude": "Masquer le batch cooking",
     "clearFilters": "Effacer les filtres",
     "tabMine": "Mes recettes",
     "tabFavorites": "Favoris",