fix(VField): Seamlessly fit loader inside outlined border

fixes #19410

Author: yuwu9145

packages/vuetify/src/components/VField/VField.sass

@@ -453,6 +453,8 @@
 
   .v-field--variant-outlined &
     top: calc(100% - 3px)
+    width: calc(100% - #{$field-border-width} * 2)
+    left: $field-border-width
 
 /* endregion */
 /* region OVERLAY */