Refactor layout components for improved readability and consistency

src/views/maint/MasterDetailMnt.vue

@@ -330,8 +330,8 @@ function handleDeleteSemester (id: number) {
 // 開始編輯子檔 (複製資料到暫存表單)
 function startDetailEdit () {
   if (!selectedSemester.value) return
-  // Deep copy 以避免直接修改原始資料 (Vue 的響應式特性)
-  detailForm.value = JSON.parse(JSON.stringify(selectedSemester.value))
+  // 需要深拷貝來避免直接改到原始資料，且保留巢狀結構的語意
+  detailForm.value = structuredClone(selectedSemester.value)
   isDetailEditing.value = true
 }
 
@@ -353,24 +353,6 @@ function saveDetailEdit () {
   detailForm.value = null
 }
 
-// 編輯模式：新增課程項目
-function addCourseToDetail () {
-  if (!detailForm.value) return
-  detailForm.value.courses.push({
-    code: '',
-    name: '',
-    credits: 3,
-    score: 0
-  })
-}
-
-// 編輯模式：移除課程項目
-function removeCourseFromDetail (index: number) {
-  if (!detailForm.value) return
-  detailForm.value.courses.splice(index, 1)
-}
-
-
 const {
   errorSummary,
   fieldErrors,
@@ -412,7 +394,6 @@ const dialogSubtitle = computed(() => {
 // 載入/儲存時鎖定、檢視模式 readonly
 const isFormLocked = computed(() => isLoading.value || isSaving.value)
 const {
-  closeDialog,
   confirmClose,
   confirmCloseVisible,
   confirmDelete,
@@ -422,7 +403,6 @@ const {
   confirmSaveVisible,
   confirmSwitch,
   confirmSwitchVisible,
-  currentEditingRecord,
   handleDialogVisibility,
   hasNextRecord,
   hasPrevRecord,

src/views/maint/MasterDetailMntB.vue

@@ -474,7 +474,6 @@ const dialogSubtitle = computed(() => {
 // 載入/儲存時鎖定、檢視模式 readonly
 const isFormLocked = computed(() => isLoading.value || isSaving.value)
 const {
-  closeDialog,
   confirmClose,
   confirmCloseVisible,
   confirmDelete,
@@ -484,7 +483,6 @@ const {
   confirmSaveVisible,
   confirmSwitch,
   confirmSwitchVisible,
-  currentEditingRecord,
   handleDialogVisibility,
   hasNextRecord,
   hasPrevRecord,

src/views/maint/MasterDetailMntC.vue

@@ -484,7 +484,6 @@ const dialogSubtitle = computed(() => {
 // 載入/儲存時鎖定、檢視模式 readonly
 const isFormLocked = computed(() => isLoading.value || isSaving.value)
 const {
-  closeDialog,
   confirmClose,
   confirmCloseVisible,
   confirmDelete,
@@ -494,7 +493,6 @@ const {
   confirmSaveVisible,
   confirmSwitch,
   confirmSwitchVisible,
-  currentEditingRecord,
   handleDialogVisibility,
   hasNextRecord,
   hasPrevRecord,

src/views/maint/SingleRecordMnt.vue

@@ -402,11 +402,11 @@ import { mdiBroom, mdiDelete, mdiEye, mdiMagnify, mdiPencil } from '@mdi/js'
 import { computed, nextTick, ref } from 'vue'
 import { useDisplay } from 'vuetify'
 import MaintenanceCrudDialogs from '@/components/maintenance/MaintenanceCrudDialogs.vue'
-import { useMaintenanceCrudFlow } from '@/composables/maintenance/useMaintenanceCrudFlow'
-import { useStudentMaintenanceForm } from '@/composables/maintenance/useStudentMaintenanceForm'
 import MntDialogCard from '@/components/maintenance/MntDialogCard.vue'
 import MntPageCards from '@/components/maintenance/MntPageCards.vue'
 import MntRecordNavToolbar from '@/components/maintenance/MntRecordNavToolbar.vue'
+import { useMaintenanceCrudFlow } from '@/composables/maintenance/useMaintenanceCrudFlow'
+import { useStudentMaintenanceForm } from '@/composables/maintenance/useStudentMaintenanceForm'
 import { type StudentRecord, useStudentStore } from '@/stores/students'
 
 // 下拉選項：系所/年級/入學年度/狀態
@@ -525,7 +525,6 @@ const dialogSubtitle = computed(() => {
 // 載入/儲存時鎖定、檢視模式 readonly
 const isFormLocked = computed(() => isLoading.value || isSaving.value)
 const {
-  closeDialog,
   confirmClose,
   confirmCloseVisible,
   confirmDelete,
@@ -535,7 +534,6 @@ const {
   confirmSaveVisible,
   confirmSwitch,
   confirmSwitchVisible,
-  currentEditingRecord,
   handleDialogVisibility,
   hasNextRecord,
   hasPrevRecord,