fix(web): drop the branch action from user and steering bubbles
The branch control on user and consumed-steering bubbles could enable only when a completed turn ended with no node after the message at all, so readers saw a permanently unavailable control whose tooltip promised a state it could not reach. An enabled one would mislead anyway: a fork at a message seq cuts at the containing turn/end and takes the answer along, the opposite of the branch-to-re-ask reading a control on one's own bubble suggests. MessageItem loses its fork props, PendingSteeringBubble loses the showBranch special case, and messageBranchSeqs narrows to assistantBranchSeqs: only a completed turn's transcript tail that is the turn's own content-text assistant may fork. A steered turn keeps its fork point under the settled answer, because fork is a log-prefix cut and the steer is model-visible history the child inherits. Web aria goldens drop the user-bubble disabled-branch row and its hidden explanation text; the nested-subagent golden also loses the one enabled user-tail fork handle, a loss the decision note accepts.
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creatixchu
@@ -2,5 +2,5 @@
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-08-02-message-fork-actions-require-completed-turn-tail.md
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2026-08-02-message-fork-actions-require-completed-turn-tail.md: f2e7fd67b65a6ce4a86ba3f4405f78842be8f234
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2026-08-02-message-fork-actions-require-completed-turn-tail.zh.md: 2c3feeaa3ef01dbde67faa73257520918996f9c8
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2026-08-02-message-fork-actions-require-completed-turn-tail.md: abdcbc79948c67619bb70a8a87741046f65b8838
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2026-08-02-message-fork-actions-require-completed-turn-tail.zh.md: a93b572c6db3c76ce3869747fd9a7660bf3ea395
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@@ -12,6 +12,8 @@ The Web conversation attached branch to the last assistant node with nonempty te
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`ConversationSnapshot.turnEnds` retains the completed turn boundaries present in the raw event window. The conversation view walks transcript nodes through each boundary and enables branch only when the boundary's last node is a user message, a durable steering message, or a content-bearing assistant message. Open turns have no eligible message, and a later tool result, reasoning-only interruption, turn error, or other transcript node leaves branch unavailable on earlier messages. The unavailable control stays visible, focusable, and hoverable; `aria-disabled`, a tooltip, and `aria-describedby` explain the completed-tail requirement without sending a Host request. Copy and clock remain available under their existing message chrome, and the Host's completed-turn fork semantics remain unchanged.
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The message-bubble half of this eligibility is superseded by the [user-bubble branch removal](../simplification/2026-08-06-user-bubbles-drop-the-branch-action.md): user and steering bubbles no longer render the control at all, so only content-assistant tails may fork; the assistant-side gate and its visible-but-unavailable presentation stand.
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This narrows the message eligibility established by the earlier [Web session fork action decision](../feature/2026-07-27-web-session-fork-actions.md). Session-row forking still selects the latest completed turn, and eligible message actions still pass their event seq through the shared client runtime operation.
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## Alternatives considered
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@@ -12,6 +12,8 @@ Web 会话把分支操作挂到每个轮次中最后一个文本非空的 assist
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`ConversationSnapshot.turnEnds` 保留原始事件窗口中的已完成轮次边界。会话视图按各边界遍历 transcript（文本记录）节点，仅当边界的最后一个节点是用户消息、持久 steering（中途引导）消息或含内容的 assistant 消息时才启用分支操作。开放轮次没有符合条件的消息；如果后面还有工具结果、只有推理内容的中断、轮次错误或其他 transcript 节点，较早消息上的分支操作会保持不可用。不可用的控件仍然可见、可聚焦、可悬停；`aria-disabled`、tooltip 与 `aria-describedby` 会说明已完成尾部这一要求，且不会发送 Host 请求。复制和时钟仍可在既有消息 chrome 下使用，Host 按已完成轮次 fork 的语义保持不变。
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本资格判定中消息气泡的那一半已被 [user 气泡分支移除决策](../simplification/2026-08-06-user-bubbles-drop-the-branch-action.md)取代：user 与 steering 气泡不再渲染该控件，因此只有内容 assistant 尾部可以 fork；assistant 侧门禁及其可见但不可用的呈现保持有效。
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本决策收紧了较早的 [Web 会话 fork 操作决策](../feature/2026-07-27-web-session-fork-actions.md)所定义的消息资格。Session 行 fork 仍选择最新的已完成轮次；符合条件的消息操作仍通过共享 client 运行时操作传递其事件 seq。
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## 考虑过的替代方案
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