fix(loyalty): add all 27 remaining missing i18n keys

Comprehensive audit found 618 total translation references across all
templates and JS files. Added 27 missing keys to all 4 locale files:
- store.terminal: card_label, confirm, pin_authorize_text, free_item,
  reward_label, search_empty_state
- store.card_detail: card_label
- store.enroll: bonus_points, card_number_label, points
- store.settings: access_restricted_desc, delete_program_* (3 keys)
- common: setup_program, unknown
- errors: card_not_found
- shared.pins: save_changes, unlock
- toasts: pin_created/updated/deleted/unlocked + error variants (8 keys)

All 618 keys now resolve. 778 total keys per locale file.

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

app/modules/loyalty/locales/en.json

@@ -169,7 +169,9 @@
     "total": "TOTAL",
     "view": "View",
     "yes": "Yes",
-    "contact_admin_setup": "Contact your administrator to set up the loyalty program"
+    "contact_admin_setup": "Contact your administrator to set up the loyalty program",
+    "setup_program": "Set Up Program",
+    "unknown": "Unknown"
   },
   "transactions": {
     "card_created": "Enrolled",
@@ -354,7 +356,9 @@
       "pin_unlocked": "PIN unlocked successfully",
       "save": "Save",
       "cancel": "Cancel",
-      "read_only_notice": "PINs are read-only in admin view"
+      "read_only_notice": "PINs are read-only in admin view",
+      "save_changes": "Save Changes",
+      "unlock": "Unlock"
     },
     "program_form": {
       "program_type": "Program Type",
@@ -694,7 +698,13 @@
       "stamp_added": "Stamp added!",
       "stamps_redeemed": "Stamps redeemed! Reward earned.",
       "x_points_awarded": "{points} points awarded!",
-      "reward_redeemed": "Reward redeemed: {name}"
+      "reward_redeemed": "Reward redeemed: {name}",
+      "card_label": "Card",
+      "confirm": "Confirm",
+      "pin_authorize_text": "Enter your staff PIN to authorize this transaction",
+      "free_item": "Free item",
+      "reward_label": "Reward",
+      "search_empty_state": "Search for a customer to get started"
     },
     "cards": {
       "title": "Loyalty Members",
@@ -742,7 +752,8 @@
       "col_points": "Points",
       "col_location": "Location",
       "col_notes": "Notes",
-      "no_transactions": "No transactions yet"
+      "no_transactions": "No transactions yet",
+      "card_label": "Card"
     },
     "enroll": {
       "title": "Enroll Customer",
@@ -769,7 +780,10 @@
       "x_points": "{count} points",
       "back_to_terminal": "Back to Terminal",
       "enroll_another": "Enroll Another",
-      "enrollment_failed": "Enrollment failed: {message}"
+      "enrollment_failed": "Enrollment failed: {message}",
+      "bonus_points": "Bonus Points",
+      "card_number_label": "Card Number",
+      "points": "points"
     },
     "analytics": {
       "title": "Loyalty Analytics",
@@ -814,7 +828,11 @@
       "program_updated": "Program updated successfully",
       "program_deleted": "Loyalty program deleted",
       "save_failed": "Failed to save: {message}",
-      "delete_failed": "Failed to delete: {message}"
+      "delete_failed": "Failed to delete: {message}",
+      "access_restricted_desc": "Only the merchant owner can modify program settings",
+      "delete_program_confirm": "Delete",
+      "delete_program_desc": "This will permanently delete the loyalty program and all associated data",
+      "delete_program_title": "Delete Loyalty Program?"
     }
   },
   "storefront": {
@@ -870,6 +888,17 @@
     "save_failed": "Failed to save: {message}",
     "settings_save_failed": "Failed to save settings: {message}",
     "create_failed": "Failed to create program: {message}",
-    "logo_required": "Logo URL is required for wallet integration."
+    "logo_required": "Logo URL is required for wallet integration.",
+    "pin_created": "PIN created successfully",
+    "pin_updated": "PIN updated successfully",
+    "pin_deleted": "PIN deleted successfully",
+    "pin_unlocked": "PIN unlocked successfully",
+    "pin_create_error": "Failed to create PIN",
+    "pin_update_error": "Failed to update PIN",
+    "pin_delete_error": "Failed to delete PIN",
+    "pin_unlock_error": "Failed to unlock PIN"
+  },
+  "errors": {
+    "card_not_found": "Card not found"
   }
 }