fix: unify task detail saving

frontend/src/style.test.ts

@@ -275,11 +275,12 @@ describe('completion feedback motion', () => {
     expect(authBlock.indexOf("await syncBrowserTimezone(data.user?.timezone)")).toBeLessThan(authBlock.indexOf('await loadRestoredView()'))
   })
 
-  it('saves due removal atomically without deleting recurrence a second time', () => {
-    const saveTaskBlock = app.slice(app.indexOf('async function saveTask()'), app.indexOf('async function removeTask('))
-    expect(saveTaskBlock).not.toContain("method: 'DELETE'")
-    expect(saveTaskBlock).toContain('selectedTaskRecurrence.value = null')
-    expect(saveTaskBlock).toContain("selectedTaskRepeat.value = 'none'")
+  it('relies on the task PATCH for atomic due and recurrence synchronization', () => {
+    const saveTaskBlock = app.slice(app.indexOf('async function saveTask('), app.indexOf('async function saveSelectedTaskChanges('))
+    expect(saveTaskBlock).not.toContain('/recurrences/')
+    expect(saveTaskBlock).toContain('as Partial<Task>, false')
+    const unifiedSaveBlock = app.slice(app.indexOf('async function saveSelectedTaskChanges('), app.indexOf('async function removeTask('))
+    expect(unifiedSaveBlock).toContain('const repeatRecurrence = taskSaved.due_at ? recurrence : null')
   })
 
   it('keeps all task composer touch controls at least 44px on mobile without horizontal overflow', () => {
@@ -739,8 +740,8 @@ describe('task and habit row decoration', () => {
   })
 
   it('reclassifies Today tasks after due edits without toggling page loading', () => {
-    const saveBlock = app.slice(app.indexOf('async function saveTask()'), app.indexOf('async function removeTask'))
-    const refreshBlock = app.slice(app.indexOf('async function refreshTodayAfterTaskSave()'), app.indexOf('async function saveTask()'))
+    const saveBlock = app.slice(app.indexOf('async function saveTask('), app.indexOf('async function removeTask'))
+    const refreshBlock = app.slice(app.indexOf('async function refreshTodayAfterTaskSave()'), app.indexOf('async function saveTask('))
     expect(saveBlock).toContain('await refreshTodayAfterTaskSave()')
     expect(refreshBlock).toContain('loadTasksPage(request)')
     expect(refreshBlock).toContain('loadOverdueTasks(request)')
@@ -966,13 +967,33 @@ describe('unified floating add interaction', () => {
     expect(app).toContain('完成后 <input v-model="selectedAfterCompletionDays"')
     expect(app).toContain('每次完成后，将截止时间顺延对应天数；首版永不结束')
     expect(app).toContain('buildTaskRecurrencePayload(composeRepeat.value')
-    expect(app).toContain('buildTaskRecurrencePayload(value, { afterCompletionDays: selectedAfterCompletionDays.value')
+    expect(app).toContain('buildTaskRecurrencePayload(value, { afterCompletionDays, repeatConfig: config })')
     expect(app).toContain("api(`/tasks/${task.id}/recurrence`)")
     const createBlock = app.slice(app.indexOf('async function submitTaskCompose()'), app.indexOf('function toggleSidebar()'))
     expect(createBlock).toContain("api('/tasks',")
     expect(createBlock).not.toContain("api('/recurrences'")
-    const saveBlock = app.slice(app.indexOf('async function updateSelectedTaskRepeat()'), app.indexOf('async function submitTaskCompose()'))
-    expect(saveBlock).not.toContain('selectedTaskRepeat.value = parseTaskRecurrence')
+    const saveBlock = app.slice(app.indexOf('async function saveSelectedTaskChanges()'), app.indexOf('async function removeTask'))
+    expect(saveBlock).toContain("const taskId = selectedTask.value?.id")
+    expect(saveBlock).toContain('const selectionToken = recurrenceLoadToken')
+    expect(saveBlock).toContain("const repeatValue = selectedTask.value?.due_at ? selectedTaskRepeat.value : 'none'")
+    expect(saveBlock).toContain('structuredClone(selectedRepeatConfig.value)')
+    expect(saveBlock).toContain("const taskSaved = await saveTask({ showSuccess: false, expectedTaskId: taskId, expectedSelectionToken: selectionToken })")
+    expect(saveBlock).toContain("recurrenceLoadToken !== selectionToken")
+    expect(saveBlock).toContain('const repeatRecurrence = taskSaved.due_at ? recurrence : null')
+    expect(saveBlock).toContain('await saveRepeat(taskSaved, repeatValue, repeatConfig, afterCompletionDays, repeatRecurrence)')
+    expect(saveBlock).toContain("selectedRepeatError.value = ''")
+    expect(saveBlock).toContain("selectedRepeatError.value = reason instanceof Error ? reason.message : '保存失败'")
+    expect(saveBlock.indexOf("toast('已保存')")).toBeGreaterThan(saveBlock.indexOf('await saveRepeat(taskSaved, repeatValue, repeatConfig, afterCompletionDays, repeatRecurrence)'))
+    expect(saveBlock).toContain('if (savingSelectedTask.value || recurrenceLoading.value) return')
+    expect(saveBlock).toContain('savingSelectedTask.value = true')
+    expect(saveBlock).toContain('savingSelectedTask.value = false')
+    expect(saveBlock).toContain("const repeatValue = selectedTask.value?.due_at ? selectedTaskRepeat.value : 'none'")
+    expect(app).toContain(':disabled="savingSelectedTask || recurrenceLoading" @click="saveSelectedTaskChanges"')
+    expect(app).not.toContain('@blur="saveTask()"')
+    expect(app).not.toContain('@change="saveTask()"')
+    expect(app).not.toContain('value;saveTask()')
+    expect(app).not.toContain('async function updateSelectedTaskRepeat()')
+    expect(app).not.toContain('保存重复设置')
     expect(css).toContain('.after-completion-fields input{width:76px;min-height:44px')
     expect(app).toContain('<option value="custom">自定义…</option>')
     expect(app).toContain('class="repeat-custom-fields"')