feat(extensions): 扩展交互 GUI 适配——对话框四件套 + notify Toast（#45） - #49
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ImageTray 原在 Composer 文档流内，粘贴后撑高输入框列压缩 main， 正在阅读的消息被齐边切掉（视觉上像被白底盖住）。改为 absolute bottom-full 悬浮在对话区之上：无包裹卡片，容器透明只做排布， 每张缩略图自带 shadow-pop 单独浮起；多图列宽内换行、向上生长。 Composer 内容列加 relative 作为悬浮锚。
梳理 ExtensionUIContext ~30 方法的交互全景（阻塞对话框/即发即忘/数据旁路）， 对齐官方 RPC 降级语义，给出 P0-P3 分层与落地路径（issue #45 根因分析）。 INDEX 的 ui-context 条目挂调研文档链接。
pi 扩展的 ctx.ui 从全量 no-op 升级为真实 GUI 交互（issue #45：ask-user-question 类插件此前静默返回「用户取消」，AI 被误导）： - backend：ExtensionDialogHost（每会话队列 + timeout/signal 宿主裁决 + fail-closed 取消值 + dispose 兜底）；makeUiContext(deps) 重写——select/input/editor/confirm 走对话框宿主、notify/setEditorText 走回调、setTheme 诚实失败、getEditorText 对齐 RPC 降级；bindExtensions 无条件绑定 + mode rpc + onError→log/trace（与权限门逃生 舱解耦） - renderer：DockSlot 同槽仲裁（权限>对话框>Composer）+ InteractionDock 四卡 （键盘/倒计时/排队）；notify→Toast 限流（8s 去重/上限 3/溢出折叠）；setEditorText →草稿+一次性来源提示；后台 tab attention 呼吸点扩展 - 权限审批卡迁移无边框设计语言（amber glyph + 幽灵按钮，行为/记忆逻辑不变） - 第三方 confirm 走通用中性卡（权限通道不经通用对话框，不双弹） - 验证：backend 473 + desktop 328 测试全绿（新增 21 例）、冒烟脚本 4 断言、 CDP E2E 手测 8 命令
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背景
close #45 —— pi 扩展的
ctx.ui此前在 Percho 是全量 no-op：select/input/editor静默返回取消值，ask-user-question类插件误以为「用户拒绝回答」，AI 被误导，用户毫不知情。调研与方案：
docs/extension-ui.md（ExtensionUIContext 全景 + 对齐官方 RPC 降级语义 + P0-P3 分层）。本期落地（P0+P1 核心）
select/input/editor/confirm→ 底部停靠槽（与权限审批同位互换 Composer），opts.timeout/signal由 backend 宿主裁决（超时/中止自动按取消值 resolve，fail-closed，绝不伪造用户输入）onError接 log/trace；setTheme诚实失败；mode 改绑rpc；绑定与权限门逃生舱解耦明确不做（本期冻结）
setStatus/setWidget/setTitle、custom() 及组件工厂系（终端渲染模型，对齐 RPC 返回降级值）、P2 显示层投影、LAN 应答。
验证
npm run typecheck && npm run lint && npm run test全绿（backend 473 + desktop 328，新增 21 例）scripts/smoke-extension-dialogs.mts4 断言全 PASS（形状/超时/AbortSignal/应答链）