[产品讨论] PR #951 feat(desktop): 新任务上下文快捷入口与一键启动

## 触发原因

PR #951 新增「新任务」上下文快捷入口与一键启动功能，属于新增用户可见产品功能。

## 需要确认

- 快捷入口的交互设计与入口位置？
- 与现有新建对话/新建任务流程的关系？

## 放行方式

产品白名单成员（@dashhuang / @xdanger / @MagicLizi / @zqchris）在本 issue 或 PR 评论区明确同意。

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关联 PR:#951(作者 @JackZhou-XD);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的产品 / UI 变更,聊清楚后 PR 会恢复审查。

Start by reading PR #951 and the existing new-conversation and new-task flows. Clarify the shortcut's interaction and placement, and how it relates to those flows. The work is done when an approved product decision is recorded by a product whitelist member in this issue or the PR.

Written by the indexing model from the issue text.