2.0: weekly shopping list from planned dishes

- ShoppingItem model (per-week lines; dish-derived or free-text) + schema.
- ShoppingListService.reconcile mirrors planned dishes' ingredients into the
  list, preserving check-off state and user items; plain-text export helper.
- ShoppingListView: grouped by dish, check-off, swipe-delete, free-text adds,
  clear-checked, ShareLink export, and inline on-device "Generate" for planned
  dishes without ingredients (paywall after 3 free generations,
  source=ingredient_generation).
- Home toolbar: cart entry point (all users) + sheet.
- Analytics: shopping_list_opened, shopping_item_added, ingredients_generated.
- Localized in all 6 languages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BkanrydYtrme8wipTzWssG

MealMood/Resources/en.lproj/Localizable.strings

@@ -384,3 +384,16 @@
 /* Offer codes + share link (1.2.0) */
 "premium_redeem_code" = "Redeem promo code";
 "share_link_text" = "Our week, planned with MealMood → https://mealmood.app";
+
+// Shopping list (2.0)
+"shopping_list_title" = "Shopping List";
+"shopping_done" = "Done";
+"shopping_missing_ingredients" = "No ingredients yet";
+"shopping_other_items" = "Other items";
+"shopping_add_item_placeholder" = "Add item…";
+"shopping_generate" = "Generate";
+"shopping_clear_checked" = "Clear checked items";
+"shopping_delete" = "Delete";
+"shopping_empty_title" = "Nothing to buy yet";
+"shopping_empty_message" = "Plan dishes for this week and their ingredients will appear here.";
+"shopping_share_header" = "🛒 Shopping list — MealMood";