[FIX] stock_ux: location context crash + field .reference inexistente

Dos bugs en `_compute_product_uom_qty_location` (stock_move_line.py) que se
disparan al abrir cualquier vista de stock.move.line filtrada por location:

1. `location[0]` asume que `location` es list/tuple/str. En Odoo 19 algunas
   vistas lo pasan como `int` (ID único de stock.location) → crashea con
   `TypeError: 'int' object is not subscriptable`. Ahora normaliza los 3
   casos (int / list-tuple / str).

2. El lookup posterior usaba `browse(id).reference`, campo que NO existe
   en stock.location (en v18 tampoco, probablemente residuo de un rename
   muy viejo). Crasheaba con
   `AttributeError: 'stock.location' object has no attribute 'reference'`.
   Fijo a `.complete_name`, que es el campo consistente con la `search`
   posterior `('complete_name', 'ilike', location_name)`.

Validado con ORM shell en 4 casos (int / list[int] / str / ""), todos
retornan resultados consistentes y sin excepción.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: matiasgibbons

stock_ux/__manifest__.py

@@ -19,7 +19,7 @@
 ##############################################################################
 {
     "name": "Stock UX",
-    "version": "19.0.1.3.0",
+    "version": "19.0.1.3.1",
     "category": "Warehouse Management",
     "sequence": 14,
     "summary": "",

stock_ux/models/stock_move_line.py

@@ -36,12 +36,18 @@ def _compute_product_uom_qty_location(self):
         if not location:
             self.update({"product_uom_qty_location": 0.0})
             return False
-        # because now we use location_id to select location, we have compelte
-        # location name. If y need we can use some code of
-        # _get_domain_locations on stock/product.py
-        location_name = location[0]
-        if isinstance(location[0], int):
-            location_name = self.env["stock.location"].browse(location[0]).reference
+        # `location` puede venir como int (ID único), list/tuple de ints, o string.
+        # En v19 algunas vistas lo pasan como int directo → location[0] explota.
+        if isinstance(location, int):
+            location_name = self.env["stock.location"].browse(location).complete_name
+        elif isinstance(location, (list, tuple)):
+            first = location[0]
+            location_name = (
+                self.env["stock.location"].browse(first).complete_name
+                if isinstance(first, int) else first
+            )
+        else:
+            location_name = location  # string
         locations = self.env["stock.location"].search([("complete_name", "ilike", location_name)])
         for rec in self:
             product_uom_qty_location = rec.quantity