Add Operations - WO Shortages page with MTS/MTO shortage tracking

Automates the production manager's manual workflow of checking xTuple WO
Schedule + Kit Material Shortage for FA department work orders. Two tabs:
WO Shortages (detail per WO + shortage line) and Critical Parts (aggregated
parts blocking near-term shipments). Nav button added to all pages.

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

application.json

@@ -64,6 +64,10 @@
     {
       "id": "Operations - Unused Items",
       "isDefault": false
+    },
+    {
+      "id": "Operations - WO Shortages",
+      "isDefault": false
     }
   ],
   "unpublishedAppLayout": {