fix(effort): restore StatusBanner import in InstructorEdit

The InstructorPageShell extraction (refactor 4601108) replaced the
StatusBanner import in InstructorEdit.vue, but the template still
references StatusBanner three times for save/error feedback. Vue logged
"Failed to resolve component: StatusBanner" warnings and rendered those
banners blank.

Author: rlorenzo

VueApp/src/Effort/pages/InstructorEdit.vue

@@ -284,6 +284,7 @@ import type {
     PercentAssignTypeDto,
     UnitDto,
 } from "../types"
+import StatusBanner from "@/components/StatusBanner.vue"
 import InstructorPageShell from "../components/InstructorPageShell.vue"
 import PercentAssignmentTable from "../components/PercentAssignmentTable.vue"
 import PercentAssignmentAddDialog from "../components/PercentAssignmentAddDialog.vue"