fix: shopping list categories were English-only and untranslated, page too narrow

Confirmed from a real screenshot: every item in an all-French shopping list
was uncategorized because guessAisle() only matched English keywords —
"sometimes reorganize doesn't work" was actually "always fails on non-English
ingredient names". Also fixed:

- Categories are now translated (grocery-categories.ts stores locale-
  independent slugs like "produce", translated for display via
  shoppingLists.categories.* instead of storing/rendering the English label
  directly)
- Added French keyword coverage to the aisle guesser so auto-categorization
  actually works for French recipes
- Users can now type a custom category name from the item's category menu
- The sort-mode dropdown was showing the raw value ("category") instead of
  its label — base-ui's Select.Value has no built-in value->label lookup,
  it needs an explicit render function, which no Select in this call site
  had
- Widened the shopping list detail page (max-w-lg -> max-w-2xl)
- Root-caused a second bug visible in the same screenshot: ingredients with
  the quantity embedded in the name (e.g. "1 avocat") still showed that way
  even though quantity/unit were already populated separately, because the
  extraction helper only fired when quantity was empty. Now it always
  cleans the name but only backfills quantity/unit when they're missing,
  and runs at shopping-list generation time too (not just recipe save) so
  it also cleans up already-contaminated recipes, not just new ones.

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

apps/web/messages/en.json

@@ -826,7 +826,20 @@
     "listDeleted": "List deleted",
     "listDeleteFailed": "Failed to delete list",
     "changeCategory": "Change category",
-    "deleteItem": "Delete item"
+    "deleteItem": "Delete item",
+    "aisleOther": "Other",
+    "newCategoryPlaceholder": "New category…",
+    "addCategory": "Add",
+    "categories": {
+      "produce": "Produce",
+      "dairyEggs": "Dairy & Eggs",
+      "meatSeafood": "Meat & Seafood",
+      "bakery": "Bakery",
+      "frozen": "Frozen",
+      "pantry": "Pantry",
+      "spicesCondiments": "Spices & Condiments",
+      "beverages": "Beverages"
+    }
   },
   "collections": {
     "title": "Collections",

apps/web/messages/fr.json

@@ -814,7 +814,20 @@
     "listDeleted": "Liste supprimée",
     "listDeleteFailed": "Échec de la suppression de la liste",
     "changeCategory": "Changer de catégorie",
-    "deleteItem": "Supprimer l'article"
+    "deleteItem": "Supprimer l'article",
+    "aisleOther": "Autre",
+    "newCategoryPlaceholder": "Nouvelle catégorie…",
+    "addCategory": "Ajouter",
+    "categories": {
+      "produce": "Fruits & légumes",
+      "dairyEggs": "Produits laitiers & œufs",
+      "meatSeafood": "Viande & poisson",
+      "bakery": "Boulangerie",
+      "frozen": "Surgelés",
+      "pantry": "Épicerie",
+      "spicesCondiments": "Épices & condiments",
+      "beverages": "Boissons"
+    }
   },
   "collections": {
     "title": "Collections",