fix(任务): 归档以整棵树为单位并移除隐藏中间态

- 自动归档改为 doneAt + autoArchive 到期，只判定顶层任务，到期整树归档
- 手动归档/恢复提升到根父任务，子任务完全跟随父任务
- 新增 normalizeArchiveTree 修复历史父子归档不一致
- 移除按列保留窗口的显示过滤（前后端实现删除，T-FL-01~15 废止）
- 列 retention 字段仅兼容旧数据保留，不再参与判定
- 已归档查询返回归档子任务，删除提示可正确显示连带条数

src/api/task.js

@@ -5,7 +5,6 @@
 // 见 docs/V0.2/离线编辑模块/0.2.1实施方案.md
 import { getPowersyncDb } from '../lib/powersync/db.js'
 import { api, getCurrentUserId } from './client.js'
-import { filterVisible } from '../pages/task/date.js'
 
 const db = () => getPowersyncDb()
 
@@ -380,10 +379,6 @@ export const columnApi = {
       if (body.boundStatus !== null && !['todo', 'doing', 'done'].includes(body.boundStatus)) throw new Error('绑定状态取值非法')
       data.boundStatus = body.boundStatus
     }
-    if (body?.retention !== undefined) {
-      if (!['never', 'today', '3d', 'week', 'month', 'forever'].includes(body.retention)) throw new Error('保留选项取值非法')
-      data.retention = body.retention
-    }
     const sets = Object.keys(data).map((k) => `"${k}" = ?`)
     if (sets.length) {
       await db().execute(`UPDATE BoardColumn SET ${sets.join(', ')}, updatedAt = ? WHERE id = ?`, [...Object.values(data), now(), String(id)])
@@ -452,17 +447,16 @@ export const taskApi = {
     )
     const shape = await shapeTasks(rows, columns)
     const shaped = rows.map(shape)
-    // 子任务挂载 (与服务端 TASK_INCLUDE.children 同构)
+    // 子任务挂载 (与服务端 TASK_INCLUDE.children 同构); 子任务完全跟随父任务
     for (const t of shaped) {
       const childRows = await db().getAll(
-        'SELECT * FROM Task WHERE parentId = ? ORDER BY sortOrder, id',
+        'SELECT * FROM Task WHERE parentId = ? AND archived = 0 ORDER BY sortOrder, id',
         [String(t.id)],
       )
       const childShape = await shapeTasks(childRows, columns)
       t.children = childRows.map(childShape)
     }
-    const visible = filterVisible(shaped, columns)
-    return { items: visible, columns, total: shaped.length }
+    return { items: shaped, columns, total: shaped.length }
   },
 
   create: async (projectId, body) => {
@@ -711,16 +705,20 @@ export const taskApi = {
   },
   // ---------- 归档 (T-ARC, 本地实现: 写本地库 -> 上行) ----------
 
-  /** 手动归档: 连带全部子任务, 幂等 (T-ARC-01) */
+  /** 手动归档: 以整棵树为单位 (子任务跟随父任务), 幂等 (T-ARC-01) */
   archive: async (id) => {
     const task = await db().getOptional('SELECT * FROM Task WHERE id = ?', [String(id)])
     if (!task) throw new Error('任务不存在或无权限')
+    // 子任务被单独归档时, 提升到根父任务, 避免父子状态不一致
+    const root = task.parentId
+      ? (await db().getOptional('SELECT * FROM Task WHERE id = ?', [String(task.parentId)])) || task
+      : task
     // 不能写 const now = now(): 同名 const 会遮蔽模块级 now, 右侧求值落入 TDZ,
     // 压缩后报 "Cannot access 'a' before initialization"
     const ts = now()
     await db().writeTransaction(async (tx) => {
-      const kids = await tx.getAll('SELECT id FROM Task WHERE parentId = ?', [String(task.id)])
-      const ids = [String(task.id), ...kids.map((k) => String(k.id))]
+      const kids = await tx.getAll('SELECT id FROM Task WHERE parentId = ?', [String(root.id)])
+      const ids = [String(root.id), ...kids.map((k) => String(k.id))]
       const ph = ids.map(() => '?').join(',')
       await tx.execute(
         `UPDATE Task SET archived = 1, archivedAt = ?, archiveSource = 'manual', updatedAt = ? WHERE id IN (${ph})`,
@@ -730,14 +728,17 @@ export const taskApi = {
     return { ok: true, count: 1 }
   },
 
-  /** 恢复归档: 回原列, 状态不变, 连带子任务 (T-ARC-03) */
+  /** 恢复归档: 回原列, 状态不变, 以整棵树为单位 (T-ARC-03) */
   unarchive: async (id) => {
     const task = await db().getOptional('SELECT * FROM Task WHERE id = ?', [String(id)])
     if (!task) throw new Error('任务不存在或无权限')
+    const root = task.parentId
+      ? (await db().getOptional('SELECT * FROM Task WHERE id = ?', [String(task.parentId)])) || task
+      : task
     const ts = now()
     await db().writeTransaction(async (tx) => {
-      const kids = await tx.getAll('SELECT id FROM Task WHERE parentId = ?', [String(task.id)])
-      const ids = [String(task.id), ...kids.map((k) => String(k.id))]
+      const kids = await tx.getAll('SELECT id FROM Task WHERE parentId = ?', [String(root.id)])
+      const ids = [String(root.id), ...kids.map((k) => String(k.id))]
       const ph = ids.map(() => '?').join(',')
       await tx.execute(
         `UPDATE Task SET archived = 0, archivedAt = NULL, archiveSource = NULL, updatedAt = ? WHERE id IN (${ph})`,