fix: translate remaining pantry UI (print button, manager, print page)

pantry-page-header's Print button, the pantry-manager add/remove
form (item name, qty, unit, expiry badges), and the print/pantry
page (title, column headers, item count, empty state, footer) were
all hardcoded English.

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

apps/web/messages/en.json

@@ -506,7 +506,24 @@
   "pantry": {
     "title": "Pantry",
     "subtitle": "Track what you have on hand",
-    "canCook": "What can I cook?"
+    "canCook": "What can I cook?",
+    "itemNamePlaceholder": "Item name",
+    "qtyPlaceholder": "Qty",
+    "unitPlaceholder": "Unit",
+    "add": "Add",
+    "addFailed": "Failed to add",
+    "removeFailed": "Failed to remove",
+    "empty": "No pantry items yet.",
+    "expired": "Expired",
+    "expiresInDays": "Expires in {days}d",
+    "expiresOn": "Expires {date}",
+    "printItemCountSingular": "{count} item",
+    "printItemCountPlural": "{count} items",
+    "noItems": "No items in pantry.",
+    "colItem": "Item",
+    "colQuantity": "Quantity",
+    "colExpires": "Expires",
+    "expiredDaysAgo": "Expired {days}d ago"
   },
   "feed": {
     "title": "Feed",