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 with customer name, YYYY-MM-DD
dates) and Critical Parts (aggregated parts blocking near-term shipments
with QOH from MPE warehouse). Nav button added to all pages.

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

pages/Sales - Units Shipped/widgets/Container1/Button3Copy2.json

@@ -2,7 +2,6 @@
   "animateLoading": true,
   "borderRadius": "0.375rem",
   "bottomRow": 52,
-  "boxShadow": "none",
   "buttonColor": "#ffffff",
   "buttonVariant": "PRIMARY",
   "disabledWhenInvalid": false,
@@ -43,5 +42,6 @@
   "type": "BUTTON_WIDGET",
   "version": 1,
   "widgetId": "su1btn3ui",
-  "widgetName": "Button3Copy2"
-}
+  "widgetName": "Button3Copy2",
+  "boxShadow": "none"
+}