fix(mobile): 新建任务输入内容返回后保留 - #1100
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新建任务页在返回首页/任务列表后会被卸载，本地 useState 丢失用户已输入的任务描述。增加模块级草稿缓存，保存 content / repoKey / manualRepo，返回再进入时恢复上次输入， 对齐网页版体验；任务创建成功后清空草稿。 Fixes chaitin#851
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问题
App 新建任务页输入框输入内容后，返回首页再回到任务列表，之前输入的内容丢失；网页版可保留（#851）。
根因
new-task.tsx的任务描述content（以及repoKey/manualRepo）都是组件本地useState。返回首页/任务列表时该屏幕被卸载，再次进入时组件重新挂载，状态重置为空。修复
新增模块级草稿缓存
mobile/src/new-task-draft.ts，在应用会话内缓存草稿：useState(() => getNewTaskDraft().content ?? '')（repoKey、manualRepo同理）useEffect监听content/repoKey/manualRepo变化并写回缓存clearNewTaskDraft()清空草稿仅覆盖应用会话内的导航往返场景，与 #851 描述的「返回再进入」一致，不做持久化落盘。
改动
mobile/src/new-task-draft.tsmobile/app/new-task.tsxFixes #851