Derive Workspace recency independently of manual order
独立于手动顺序派生 Workspace 最近更新顺序
An editable activity-promoted list can disagree with its displayed timestamps without a drag: an older Session arriving late is promoted ahead of a newer Session already observed. Repeating the same complete list preserves that inversion. The historical [sidebar-order decision](../../archived/feature/2026-08-11-workspace-sidebar-order-and-folding.md) shared one editable order between Manual and Last updated to preser
English
Problem
An editable activity-promoted list can disagree with its displayed timestamps without a drag: an older Session arriving late is promoted ahead of a newer Session already observed. Repeating the same complete list preserves that inversion. The historical sidebar-order decision shared one editable order between Manual and Last updated to preserve positions when switching modes. That trade-off does not satisfy chronological browsing.
Decision
Last updated is a pure projection of current Session summaries: ordinary rows sort by descending updatedAt, with Session id as the tie-break. The selected blank New Session precedes ordinary rows until its first prompt. Grouped, Ungrouped, and flat views use the same policy. Reloads and delayed summaries require no observed-timestamp history or promotion events in the view store.
Manual reads browser-persisted Session display order. A Session drag snapshots every active account, applies the move to its browser-local account, and selects Manual atomically. Entering Manual also freezes every active account from the current chronological ordering. Returning to Last updated discards the manual layout; entering Manual again starts from the current timestamps. The Session pinning and archive rules own missing-member supplementation and keep archive visibility out of saved membership. New members without summaries wait for the summary, while previously saved slots survive a temporarily missing summary. Workspace membership and Workspace-group order remain Host-owned; Workspace-group drags still call the Host reorder operation.
The selected blank New Session is a display invariant applied after either base order: it remains first and cannot start a drag. Manual persists the observed blank position even while the Workspace stream reconnects, preserving every other saved member until the complete baseline permits reconciliation. Waiting to record that position would lose it if the first prompt arrives before the baseline. Its first prompt removes the blank state. Manual then keeps the existing first slot and allows dragging; Last updated projects it from the prompt timestamp. The ordering subscription and reconciliation remain mounted when the sidebar is collapsed or search replaces the list body.
The persistence key stores grouping, expansion, and saved Manual positions. Persisted observed-timestamp data is removed when active account keys are retained. Current metadata owns timestamp accuracy: a cold summary without prompt metadata can fall back to creation time, independently of view ordering.
Alternatives considered
Keep activity promotion and sort again on reconnect. Late summaries and metadata corrections also arrive within a connection. A reconnect-only repair still allows chronology to depend on observation order.
Restore a separate manual layout on mode switches. Replacing the visible list with old positions makes entering Manual surprising. Resetting the layout on a mode change gives Manual the simpler meaning of pausing the current ordering.
Persist a second chronological order. Current timestamps already determine that order. A second ledger retains synchronization and recovery work without representing an independent user choice.
Disable dragging in Last updated. Switching to Manual on a committed drag keeps the existing affordance and gives the edited order an explicit mode. A cancelled or ineffective drag leaves the selected mode unchanged.
Consequences
Manual pauses automatic sorting of the current list. The default is Last updated, and reloads retain the selected mode and current manual positions. Chronological browsing gives up persistent drag exceptions. The view store owns manual Session positions but no activity timestamps; the Host Session-account order does not participate in this browser's display order.
The archived sidebar note remains frozen historical evidence; its folding and Workspace-order decisions are outside this change. No active note owns the superseded shared-order policy.
Testing
Component regressions cover older first arrivals, corrected and decreasing timestamps, delayed summaries, discarded-layout isolation, atomic mode switches, blank insertion and drag prevention, the first-prompt transition, collapsed-sidebar reconciliation, reloads, and automatic Manual selection on drag. The recorded-session Web scenario exercises the shipped composition with persisted positions, native dragging, grouped and flat views, a pinned blank, and reloads. Existing folding cases retain the provisional blank quota.
中文
问题
可编辑且按活动置顶的列表即使没有拖拽，也可能与显示的时间不符：较旧的 Session 迟到后，会被提升到已观察到的较新 Session 之前。重复输入同一份完整列表仍会保留这个逆序。历史上的侧边栏顺序决策让手动排序和最近更新共用一份可编辑顺序，以便切换模式时保留位置。这个取舍无法满足按时间浏览的需要。
决策
最近更新是当前 Session 摘要的纯投影：普通行按 updatedAt 降序排列，时间相同时按 Session id 排序。当前选中的空白新会话在首条提示词落地前排在普通行之前。分组、Ungrouped 和单列表视图采用相同策略。重新加载和摘要迟到不需要视图存储中的已观察时间历史或提升事件。
手动排序读取浏览器持久化的 Session 显示顺序。拖拽 Session 会一次性记录所有有效记账、在对应的浏览器本地记账中应用移动，并原子地选中手动排序。直接进入手动排序同样会从当前时间顺序冻结所有有效记账。返回最近更新会丢弃手动布局；再次进入手动排序时，从当前时间戳确定的顺序开始。会话置顶与归档规则说明缺失成员补齐，并让归档显隐不影响保存的成员关系。尚无摘要的新成员会等待摘要，而已经保存的位置在摘要暂时缺失时仍会保留。Workspace 成员关系和 Workspace 分组顺序仍由 Host 拥有；拖拽 Workspace 分组仍会调用 Host 重排序操作。
当前选中的空白新会话是在两种基础顺序之后应用的显示不变式：它保持首位且无法发起拖拽。即使 Workspace 流正在重连，手动排序也会持久化已观察到的空白行位置，并保留其他所有已保存成员，直到完整基线允许对账。若等待基线后才记录该位置，首条提示词先到达时就会丢失它。首条提示词会移除空白状态；此后，手动排序保留原有首位并允许拖拽，最近更新则按提示词时间戳派生其位置。侧边栏折叠或搜索替代列表主体时，排序订阅和对账仍保持挂载。
持久化 key 保存分组方式、展开状态和手动排序位置。保留有效记账 key 时会移除持久化的已观察时间数据。时间准确性由当前元数据负责：缺少提示词元数据的冷摘要可能回退到创建时间，这与视图排序相互独立。
考虑过的替代方案
保留活动提升，并在重连时再次排序。 摘要迟到和元数据修正也会发生在一次连接内。仅在重连时修复仍会让时间顺序依赖观察先后。
切换模式时恢复独立的手动布局。 用旧位置替换可见列表会让进入手动排序的结果出乎预期。在模式变化时重置布局，让手动排序只表示暂停当前排列。
持久化第二份时间顺序。 当前时间戳已经决定该顺序。第二份账本保留了同步和恢复工作，却没有表达独立的用户选择。
禁止在最近更新中拖拽。 在提交拖拽时切到手动排序，可以保留既有操作入口，并为编辑后的顺序提供明确模式。取消或未产生有效移动的拖拽保持所选模式不变。
后果
手动排序暂停当前列表的自动排列。默认模式为最近更新，重新加载保留所选模式和当前手动位置。按时间浏览放弃持久化的拖拽例外。视图存储拥有 Session 手动位置，但不拥有活动时间戳；Host Session 记账顺序不参与本浏览器的显示顺序。
已归档的侧边栏记录保持为冻结的历史证据；其折叠和 Workspace 顺序决策不在本次修改范围内。没有活动记录拥有被替代的共享顺序策略。
测试
组件回归覆盖较旧记录首次到达、时间修正和回退、摘要迟到、已丢弃布局的隔离、原子模式切换、空白行插入与禁拖、首条提示词转换、侧边栏折叠时的对账、重新加载，以及拖拽后自动选中手动排序。录制会话 Web 场景在实际发布组合中验证持久化位置、原生拖拽、分组与单列表视图、固定首位的空白项及重新加载。既有折叠用例保留临时空白行配额。