fix(loyalty): translate category names in transaction history

Category names in transaction tables now resolve to the current
page language instead of always showing English. Updated:
- category_service.validate_category_for_store: accepts lang param,
  uses get_translated_name()
- Store transactions list route: passes request.state.language
- Card detail transactions route: passes request.state.language
- card_service.get_customer_transactions_with_store_names: accepts
  lang param for storefront route

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/loyalty/services/card_service.py

@@ -807,6 +807,7 @@ class CardService:
         *,
         skip: int = 0,
         limit: int = 20,
+        lang: str = "en",
     ) -> tuple[list[dict], int]:
         """
         Get transaction history for a card with store names resolved.
@@ -853,7 +854,7 @@ class CardService:
                 names = []
                 for cid in tx.category_ids:
                     name = category_service.validate_category_for_store(
-                        db, cid, tx.store_id or 0
+                        db, cid, tx.store_id or 0, lang=lang
                     )
                     if name:
                         names.append(name)

app/modules/loyalty/services/category_service.py

@@ -138,11 +138,11 @@ class CategoryService:
         logger.info(f"Deleted category {category_id} from store {store_id}")
 
     def validate_category_for_store(
-        self, db: Session, category_id: int, store_id: int
+        self, db: Session, category_id: int, store_id: int, lang: str = "en"
     ) -> str | None:
         """Validate that a category belongs to the store.
 
-        Returns the category name if valid, None if not found.
+        Returns the translated category name if valid, None if not found.
         """
         category = (
             db.query(StoreTransactionCategory)
@@ -153,7 +153,9 @@ class CategoryService:
             )
             .first()
         )
-        return category.name if category else None
+        if not category:
+            return None
+        return category.get_translated_name(lang)
 
 
 # Singleton