fix(partsTable): initialize new item matrice as empty and refresh on global filter change

- Default new items' matrice to empty to prevent stale values leaking from prior state
- Force matrice update when the global filter changes to keep items in sync

public/userarea/partsTable.js

@@ -1339,6 +1339,7 @@ $(document).ready(function () {
                     partId,
                     currentValue,
                     selectedMacro,
+					true
                 );
             });
         });
@@ -1415,6 +1416,7 @@ $(document).ready(function () {
         partId,
         idmatrice,
         selectedMacro = null,
+		fromFilter = false
     ) {
         if (typeof $.fn.select2 === "undefined") {
             $select.replaceWith(
@@ -1484,14 +1486,19 @@ $(document).ready(function () {
                     true,
                     true,
                 );
-                $select.append(option).trigger("change");
+
+				if (!fromFilter) $select.append(option).trigger("change");
+				else $select.append(option);
+
                 partMatrice[partNumber] = matrice.IdMatrice;
             } else {
                 // Aggiusta valore non valido
                 $select.val(null).trigger("change");
                 partMatrice[partNumber] = null;
             }
-        }
+        } else {
+			$select.val(null).trigger("change");
+		}
 
         $select.on("change", function () {
             const idmatrice = $(this).val();