feat: collections overhaul — reorder, search, edit/delete, tags (v0.53.0)

Seven related improvements to collections:

- Drag-and-drop reorder (dnd-kit, same pattern as the shopping list) — new
  collection_recipes.position column (migration 0049, backfilled from
  existing added_at order so nothing jumps around on upgrade).
- Search collections by name/description (server-side, list page) and
  search recipes within a collection (client-side filter, already loaded).
- Edit collection: name/description/tags/private notes via a new dialog;
  new collections.notes + collections.tags columns.
- Delete collection with a choice to also delete its recipes — only ones
  the deleting user actually owns, never recipes shared in by others.
- Collection detail (both owner and public view) now renders the same
  RecipeGridCard used on /recipes, instead of the older, plainer RecipeCard.
- Collection list cards redesigned — photo-collage preview (first 4 recipe
  covers/placeholders), tag badges, cleaner layout.
- Fixed the recipe count shown on a collection card: the query capped the
  `recipes` relation at 1 for thumbnail purposes and then read `.length`
  off that same capped array, so it never showed more than 1. Now a
  proper grouped count query, separate from the thumbnail fetch.

New/changed endpoints documented in OpenAPI: PATCH /collections/{id}/reorder,
DELETE /collections/{id}?deleteRecipes, PUT /collections/{id}'s new
notes/tags fields.

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

apps/web/messages/fr.json

@@ -1167,6 +1167,10 @@
     "empty": "Aucune collection pour l'instant",
     "emptyDescription": "Regroupez vos recettes par thème, occasion, ou comme bon vous semble.",
     "emptyCollection": "Aucune recette dans cette collection pour l'instant.",
+    "searchPlaceholder": "Rechercher des collections…",
+    "noSearchResults": "Aucune collection ne correspond à votre recherche",
+    "searchRecipesPlaceholder": "Rechercher des recettes dans cette collection…",
+    "noRecipeSearchResults": "Aucune recette ne correspond à votre recherche",
     "public": "Publique",
     "recipeCount": "{count} recette",
     "recipeCountPlural": "{count} recettes",
@@ -1200,6 +1204,20 @@
     "removeFromCollectionFailed": "Échec du retrait de la collection",
     "removeFromCollectionConfirmTitle": "{count, plural, one {Retirer 1 recette de cette collection ?} other {Retirer {count} recettes de cette collection ?}}",
     "removeFromCollectionConfirmDescription": "La recette elle-même ne sera pas supprimée, seulement retirée de cette collection.",
+    "reorderFailed": "Échec de l'enregistrement du nouvel ordre",
+    "editTitle": "Modifier la collection",
+    "editSuccess": "Collection mise à jour",
+    "editFailed": "Échec de la mise à jour de la collection",
+    "saving": "Enregistrement…",
+    "notesLabel": "Notes",
+    "notesPlaceholder": "Notes privées sur cette collection — vous seul(e) les voyez.",
+    "tagsLabel": "Tags",
+    "deleteSuccess": "Collection supprimée",
+    "deleteFailed": "Échec de la suppression de la collection",
+    "deleteConfirmTitle": "Supprimer cette collection ?",
+    "deleteConfirmDescription": "Ceci supprime la collection. Les recettes qu'elle contient restent intactes, sauf si vous cochez la case ci-dessous.",
+    "deleteRecipesToo": "Supprimer aussi les recettes de cette collection (seulement celles que vous possédez — rien de partagé par d'autres n'est touché)",
+    "deleting": "Suppression…",
     "generateMeal": "Générer un repas",
     "generateMealTitle": "Générer un repas complet",
     "generateMealDescription": "L'IA génère une recette par plat, toutes selon le même thème, et les ajoute à cette collection.",