fix(plugins): a New workspace item's commands stop working once its project or host is left

Every item received the same command functions, which act on the current screen state. A lookup
that finished after the user switched projects could still call setBranch or setMetadata and
overwrite the new project's choices; the reset on a switch only clears what was already written.

The setup model now hands out commands per target with commandsFor({ serverId, projectId }).
They reject with a "moved to another project or host" error when the screen is on another target,
like the lock rejects, so the promise only resolves when the change took effect.

public-docs/plugins/reference.md

@@ -2033,7 +2033,7 @@ export default function contribute(client: PluginClientContext) {
 Commands follow the [composer item](#composer-items) rules: each one acts on the screen's state
 when it runs, so `await newWorkspace.setBranch(name)` followed by `newWorkspace.setMetadata(patch)`
 changes both, and its promise resolves once the change has taken effect. A command works from your component's first effect, including a mount effect. Payloads are JSON values.
-Your items are mounted for one project on one host. When the user changes either, Paseo remounts them and clears `branch` and `metadata`, so state and `Combobox` results for the previous project do not carry over; an item that sets up in a mount effect sets up again for the new project.
+Your items are mounted for one project on one host. When the user changes either, Paseo remounts them and clears `branch` and `metadata`, so state and `Combobox` results for the previous project do not carry over; an item that sets up in a mount effect sets up again for the new project. A command called after its project or host has been left, such as the end of a lookup the user abandoned by switching, rejects with "The New workspace screen moved to another project or host; this item belongs to the previous one." and changes nothing; the items mounted for the new project are not affected.
 `host`, `project`, `baseRef` and `metadata` are frozen. While the screen creates the workspace it is locked: your fields render
 disabled and every command rejects with "The New workspace screen is locked while the workspace is
 being created." A callback that returns a promise keeps the control disabled until it settles, and a

public-docs/plugins/reference.zh-CN.md

@@ -1708,7 +1708,7 @@ export default function contribute(client: PluginClientContext) {
 | `branch`、`setBranch`       | 新 worktree 所创建的分支名称。`null` 表示由 Paseo 选择名称。隔离为本地或起点为变更请求时会保留该值，它为任何新建分支的 worktree 命名，起点可以是默认基线或所选分支；检出已有分支或变更请求的 worktree 不适用。                                                                                                                                                          |
 | `metadata`、`setMetadata`   | 所创建工作区的[元数据](/docs/plugins/hooks#metadata)，而不是第一个 Agent 的元数据。顶层键替换，`null` 删除该键。主机不支持元数据时以 “Update the host to use metadata.” 拒绝。                                                                                                                                                                                          |
 
-命令遵循 [Composer 项](#composer-items)的规则：每个命令都按界面运行时的状态执行，所以 `await newWorkspace.setBranch(name)` 之后再调用 `newWorkspace.setMetadata(patch)` 会同时生效，命令的 Promise 在更改生效后完成。命令从组件的第一个 effect 起即可使用，包括挂载时的 effect。载荷是 JSON 值。你的项针对某一台主机上的某一个项目挂载。用户更改其中任何一个时，Paseo 会重新挂载你的项并清除 `branch` 和 `metadata`，因此上一个项目的状态和 `Combobox` 结果不会保留；在挂载 effect 中做初始化的项会针对新项目再次初始化。`host`、`project`、`baseRef` 和 `metadata` 是冻结的。界面创建工作区期间会被锁定：你的字段显示为禁用，所有命令都会以 "The New workspace screen is locked while the workspace is being created." 拒绝。返回 Promise 的回调在完成之前会让控件保持禁用，被拒绝时会以错误提示向用户显示。
+命令遵循 [Composer 项](#composer-items)的规则：每个命令都按界面运行时的状态执行，所以 `await newWorkspace.setBranch(name)` 之后再调用 `newWorkspace.setMetadata(patch)` 会同时生效，命令的 Promise 在更改生效后完成。命令从组件的第一个 effect 起即可使用，包括挂载时的 effect。载荷是 JSON 值。你的项针对某一台主机上的某一个项目挂载。用户更改其中任何一个时，Paseo 会重新挂载你的项并清除 `branch` 和 `metadata`，因此上一个项目的状态和 `Combobox` 结果不会保留；在挂载 effect 中做初始化的项会针对新项目再次初始化。在其项目或主机已被离开之后才调用的命令（例如用户切换项目时被放弃的查询最终返回）会以 "The New workspace screen moved to another project or host; this item belongs to the previous one." 拒绝，并且不做任何更改；为新项目挂载的项不受影响。`host`、`project`、`baseRef` 和 `metadata` 是冻结的。界面创建工作区期间会被锁定：你的字段显示为禁用，所有命令都会以 "The New workspace screen is locked while the workspace is being created." 拒绝。返回 Promise 的回调在完成之前会让控件保持禁用，被拒绝时会以错误提示向用户显示。
 
 `Combobox` 是带可搜索列表的字段，结果由你的代码提供：