新增: Phase2 阶段收尾（Sprint 1-20）

重构：删 5 零引用 crate（df-evolve/plugin/stages/task/traceability）+ 清死模块、ai.rs 拆 11 子 module、ai.ts 拆 6 composable、i18n 拆目录
功能：知识库全栈（df-project/scan + CRUD + 时间线 + 前端）、Settings 拆分、appSettings KV 迁移、模型池、LLM 并发 Semaphore
修复：审批持久化根治、ConditionEngine 默认拒绝、NodeRegistry unimplemented 清除、promote 补偿删除、工具结果截断 50KB、路径校验防 symlink 逃逸
文档：B-03 人工审批设计、决策记录三分档、规格契约自检、经验记录、todo 看板、PROGRESS 更新

详见 PROGRESS.md。src-tauri/儿童每日打卡应用/ 与本项目无关，已排除。

src/composables/ai/useAiPanel.ts

@@ -0,0 +1,107 @@
+//! 面板与持久化 — togglePanel/toggleMaximize + UI 持久化(restoreUiState/persistUiState)
+//!                + token 开关 + providers/skills/clearChat
+//!
+//! 模块级私有:
+//! - 启动恢复:模块加载时 restoreUiState()(从 appSettings 读上次 UI 布局)
+//! - watch appSettings.cache['df-ai-ui']:loadAll() 异步填充后再次应用 UI 布局
+//!
+//! 耦合:
+//! - togglePanel/toggleMaximize/toggleArchivedFold/toggleSidebar 调 persistUiState
+
+import { watch } from 'vue'
+import { aiApi } from '../../api'
+import { useAppSettingsStore } from '../../stores/appSettings'
+import { state } from '../../stores/ai'
+
+const appSettings = useAppSettingsStore()
+
+// 启动恢复:从 appSettings(SQLite)读取上次的 UI 布局(模块级单例 state)
+// detached/docked 不恢复 — 重启后分离窗口必然不存在,必须回 false
+export function restoreUiState() {
+  const s = appSettings.get<any>('df-ai-ui', null)
+  if (!s) return
+  if (typeof s.panelOpen === 'boolean') state.panelOpen = s.panelOpen
+  if (typeof s.maximized === 'boolean') state.maximized = s.maximized
+  if (typeof s.sidebarOpen === 'boolean') state.sidebarOpen = s.sidebarOpen
+  if (typeof s.archivedCollapsed === 'boolean') state.archivedCollapsed = s.archivedCollapsed
+}
+restoreUiState()
+
+// loadAll() 异步填充缓存后,再次应用 UI 布局(模块级 state,watch 仅触发一次)
+watch(
+  () => appSettings.cache['df-ai-ui'],
+  (v) => {
+    if (!v) return
+    const s = v as any
+    if (typeof s.panelOpen === 'boolean') state.panelOpen = s.panelOpen
+    if (typeof s.maximized === 'boolean') state.maximized = s.maximized
+    if (typeof s.sidebarOpen === 'boolean') state.sidebarOpen = s.sidebarOpen
+    if (typeof s.archivedCollapsed === 'boolean') state.archivedCollapsed = s.archivedCollapsed
+  },
+)
+
+/** 持久化 UI 布局到 appSettings(debounced 写 SQLite) */
+export function persistUiState() {
+  void appSettings.set('df-ai-ui', {
+    panelOpen: state.panelOpen,
+    maximized: state.maximized,
+    sidebarOpen: state.sidebarOpen,
+    archivedCollapsed: state.archivedCollapsed,
+  })
+}
+
+/** 切换面板展开/收起(收起时同步退出最大化,避免 v-show 卡死 main 交互) */
+function togglePanel() {
+  state.panelOpen = !state.panelOpen
+  // 关闭面板时同步退出最大化，避免 <main> 被 v-show 隐藏导致其他页面无法交互
+  if (!state.panelOpen) state.maximized = false
+  persistUiState()
+}
+
+/** 最大化/还原侧栏宽度 */
+function toggleMaximize() {
+  state.maximized = !state.maximized
+  persistUiState()
+}
+
+// ── Providers / Skills / 清屏 ──
+
+/** 拉取 provider 列表(用于顶部 bar 展示与切换) */
+async function loadProviders() {
+  state.providers = await aiApi.listProviders()
+}
+
+/** 拉取本机技能列表(用于 `/` 联想,静默失败) */
+async function loadSkills() {
+  try {
+    state.skills = await aiApi.listSkills()
+  } catch {
+    // 静默失败，不影响主流程
+  }
+}
+
+/** 切换活跃 provider(后端 + 本地 state) */
+async function setProvider(providerId: string) {
+  await aiApi.setProvider(providerId)
+  state.activeProvider = providerId
+}
+
+/** 清空当前会话消息(后端 + 本地 state) */
+async function clearChat() {
+  await aiApi.clearChat()
+  state.messages = []
+  state.currentText = ''
+  state.pendingApprovals = []
+  state.streaming = false
+}
+
+export function useAiPanel() {
+  return {
+    togglePanel,
+    toggleMaximize,
+    loadProviders,
+    loadSkills,
+    setProvider,
+    clearChat,
+  }
+}