Submit page actions from the preview pane (U5)

Why: U5 closes the interactive loop - the surface view's action click
carries the user's typed drafts (and nothing else - unsubmitted input
has no upload path), the store builds the idempotent request
(client-generated requestId, current revision), guards double-clicks
in flight, and maps server outcomes to toasts (awaiting-confirm card,
revision conflict refresh, disabled rejection).

Evidence: tsc clean; vitest 95/95 including the request-shape test
(explicit data only, unique requestId per submission); knip unchanged.

Impact: Frontend-only; backend endpoint from the U5 backend branch.

Refs: U5 action-scope r2 (approved); UI PRs #46/#47; Dev task
feature/generative-ui-u5

src/App.tsx

@@ -52,8 +52,13 @@ export function App() {
         const r = await auth.fetch('/api/health')
         if (r.status === 401) { setAuthState('login'); return }
         // 已持有有效会话 cookie（或密钥）时直接放行；会话携带 must_change 时先进改密门。
+        // 改密接口只认会话登录：API key 凭证进改密门是死路（提交必 401），
+        // key 持有者清 key 回登录页，改走密码登录完成改密。
         const me = await api.me().catch(() => null)
-        if (me?.mustChangePassword) { setMustChangeOwner(me.owner); setAuthState('mustchange'); return }
+        if (me?.mustChangePassword) {
+          if (me.authVia === 'key') { auth.clear(); setAuthState('login'); return }
+          setMustChangeOwner(me.owner); setAuthState('mustchange'); return
+        }
         setAuthState('ok')
       } catch {
         setAuthState('ok') // 网络异常不是认证问题；放行交给业务层报错

src/api.ts

@@ -30,7 +30,11 @@ export const api = {
   setPermissionMode: (id: string, permissionMode: string) => auth.fetch(`${BASE}/api/conversations/${id}`, { method: 'PATCH', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ permissionMode }) }).then(r => { if (!r.ok) throw new Error(`${r.status}: ${r.statusText}`) }),
   checkpoints: (id: string, messageId: string) => auth.fetch(`${BASE}/api/conversations/${id}/checkpoints?messageId=${encodeURIComponent(messageId)}`).then(r => json<{ restored?: string[]; skipped?: string[] }>(r)),
   rewindFiles: (id: string, messageId: string) => auth.fetch(`${BASE}/api/conversations/${id}/rewind`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ messageId }) }).then(r => json<{ restored?: string[]; skipped?: string[] }>(r)),
-  me: () => auth.fetch(`${BASE}/api/me`).then(r => json<{ owner: string; name: string; auth: boolean; isAdmin?: boolean; mustChangePassword?: boolean }>(r)),
+  surfaceList: (convId: string) => auth.fetch(`${BASE}/api/conversations/${convId}/surfaces`).then(r => json<any[]>(r)),
+  submitSurfaceAction: (id: string, body: { actionId: string; revision: number; requestId: string; data: Record<string, unknown> }) =>
+    auth.fetch(`${BASE}/api/surfaces/${id}/actions`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) }).then(r => json<any>(r)),
+  surfaceGet: (id: string) => auth.fetch(`${BASE}/api/surfaces/${id}`).then(r => json<any>(r)),
+  me: () => auth.fetch(`${BASE}/api/me`).then(r => json<{ owner: string; name: string; auth: boolean; authVia?: string; isAdmin?: boolean; mustChangePassword?: boolean }>(r)),
   // ---- 认证与会话（管理员发放制，R2）----
   login: (owner: string, password: string) => auth.fetch(`${BASE}/api/auth/login`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ owner, password }) }).then(async r => {
     if (!r.ok) throw new Error(`${r.status}: ${await r.text()}`)
@@ -160,7 +164,7 @@ const streamEventListeners: Record<StreamEventType, true> = {
   'card.created': true,
   'card.updated': true,
   'card.status': true,
-  'card.resolved': true,
+  'card.resolved': true, 'surface.updated': true,
 }
 
 export function connectEvents(conversationId: string, since: number, handlers: SSEHandlers, projectId?: string): { close: () => void } {

src/auth.ts

@@ -22,6 +22,9 @@ export const auth = {
   apiKey(): string { return storage.getItem(KEY) ?? '' },
   setKey(key: string) { storage.setItem(KEY, key.trim()) },
   clear() { storage.removeItem(KEY) },
+  // 密码登录成功后切换到 HttpOnly 会话 cookie：必须清掉残留 Bearer——服务端
+  // 认证中间件 Bearer 优先于会话 cookie，失效残留 key 会把有效会话也判成 401。
+  beginSession() { this.clear() },
   // 带凭证的 fetch：未设置密钥时与原生 fetch 等价（嵌入式档无认证）。
   fetch(input: string, init?: RequestInit): Promise<Response> {
     const key = this.apiKey()

src/components/LoginPage.tsx

@@ -41,6 +41,8 @@ export function LoginPage({ onAuthed, onMustChange }: { onAuthed: () => void; on
     setErr(''); setBusy(true)
     try {
       const me = await api.login(owner.trim(), password)
+      // 会话凭证是 HttpOnly cookie；清残留 Bearer，避免其遮蔽有效会话。
+      auth.beginSession()
       if (me.mustChangePassword) {
         // 初始/重置密码：先完成强制改密再放行。
         onMustChange(me.owner)
@@ -57,7 +59,17 @@ export function LoginPage({ onAuthed, onMustChange }: { onAuthed: () => void; on
     auth.setKey(key)
     try {
       const r = await auth.fetch('/api/health')
-      if (r.ok) { onAuthed(); return }
+      if (r.ok) {
+        // 账号处于初始/重置密码状态时，key 完成不了强制改密（改密只认会话登录）：
+        // 不放行进死路改密门，引导改走账号密码登录。
+        const me = await api.me().catch(() => null)
+        if (me?.mustChangePassword) {
+          auth.clear()
+          setErr('该账号使用初始/重置密码，请先用账号密码登录完成改密')
+          return
+        }
+        onAuthed(); return
+      }
       throw new Error(String(r.status))
     } catch {
       auth.clear()
@@ -118,7 +130,7 @@ export function ChangePasswordGate({ owner, onDone, onCancel }: { owner: string;
       await api.changePassword(current, next)
       onDone()
     } catch (e) {
-      setErr(humanLoginError(String(e)).replace('401: ', ''))
+      setErr(humanChangePasswordError(String(e)))
     } finally { setBusy(false) }
   }
 
@@ -145,10 +157,23 @@ export function ChangePasswordGate({ owner, onDone, onCancel }: { owner: string;
   )
 }
 
-/** 错误文案：把 HTTP 状态码翻成人话。 */
+/** 登录错误文案：把 HTTP 状态码翻成人话。 */
 export function humanLoginError(raw: string): string {
   if (raw.includes('401')) return '用户名或密码不正确'
   if (raw.includes('429')) return '失败次数过多，请稍后再试'
   if (raw.includes('412')) return '本服务未开启登录（嵌入式单租户档）'
   return raw.replace(/^\d{3}:\s*/, '')
 }
+
+/** 改密门错误文案：改密的 401 有多种真实原因（当前密码错/无会话/会话过期/失效 key），
+ *  不能沿用登录的「用户名或密码不正确」一刀切——那会把可自愈的凭证问题伪装成密码错误。
+ *  后端文案是现行 HTTP 契约的一部分，这里按其区分并用测试锁定。 */
+export function humanChangePasswordError(raw: string): string {
+  if (raw.includes('current password incorrect')) return '当前密码不正确'
+  if (raw.includes('session login required')) return '请先用账号密码登录再改密（API 密钥不能修改密码）'
+  if (raw.includes('session expired')) return '会话已过期，请重新登录'
+  if (raw.includes('invalid or revoked API key')) return '本地残留的 API 密钥已失效，请退出登录后重试'
+  if (raw.includes('429')) return '失败次数过多，请稍后再试'
+  if (raw.includes('401')) return '认证失败，请重新登录'
+  return raw.replace(/^\d{3}:\s*/, '')
+}

src/components/PreviewPane.tsx

@@ -1,7 +1,7 @@
 // 第三栏「文件」入口的多标签预览：打开/切换/关闭标签、编辑保存、展开铺满与下载。
 // 列表 ⇄ 预览在同一入口内切换；宽度档（阅读档 420–1100）由 App 的分隔条控制。
 import { useEffect, useState } from 'react'
-import { Btn, FilePreview, Icon, TabStrip } from '@ui'
+import { Btn, FilePreview, Icon, SurfaceView, TabStrip } from '@ui'
 import { api } from '../api'
 import type { Artifact } from '../contracts'
 import { humanSize } from '../messageparts'
@@ -15,6 +15,10 @@ export function PreviewPane() {
   const artifacts = useStore(s => s.artifacts)
   const expanded = useStore(s => s.ui.previewExpanded)
   const active = tabs.find(t => t.id === activeId) ?? tabs[0]
+  const surfaces = useStore(s => s.surfaces)
+  const surfaceSnap = active?.id.startsWith('surface:')
+    ? surfaces.find(x => 'surface:' + String(x.identity.surfaceId) === active.id)
+    : undefined
   const art = active ? artifacts.find(a => a.id === active.id) : undefined
   const textKind = !!art && isTextKind(art)
   const [content, setContent] = useState<string | null>(null)
@@ -35,6 +39,32 @@ export function PreviewPane() {
   }, [art?.id])
 
   if (!active) return null
+  if (active.id.startsWith('surface:')) {
+    return (
+      <div className="preview-pane">
+        <TabStrip
+          tabs={tabs.map(t => ({ id: t.id, label: t.name }))}
+          activeId={active.id}
+          onActivate={id => store.activatePreview(id)}
+          onClose={id => store.closePreview(id)}
+        />
+        <div className="preview-pane-bar">
+          <button type="button" className="icon-btn" title="返回文件列表" onClick={() => store.setUI({ filesView: 'list', previewExpanded: false })}>
+            <Icon name="list" size={14} />
+          </button>
+          <span className="preview-pane-name" title={active.name}>{active.name}</span>
+        </div>
+        <div className="preview-pane-body">
+          {surfaceSnap
+            ? <SurfaceView snapshot={surfaceSnap} onAction={(actionId, payload) => store.handleSurfaceAction(String(surfaceSnap?.identity.surfaceId), actionId, payload as Record<string, unknown>)} docBridge={{ onOpenDoc: docId => {
+                const art = artifacts.find(a => a.id === docId)
+                if (art) store.requestPreview(art)
+              } }} />
+            : <p className="surface-view-empty">页面快照不可用（可能已被移除或无权限）。</p>}
+        </div>
+      </div>
+    )
+  }
   return (
     <div className="preview-pane">
       <TabStrip

src/contracts.ts

@@ -99,7 +99,8 @@ export type StreamEventType =
   | 'agent.spawn' | 'agent.progress' | 'agent.result'
   | 'artifact.created' | 'artifact.updated'
   | 'run.completed' | 'run.failed' | 'error'
-  | 'card.created' | 'card.updated' | 'card.status' | 'card.resolved';
+  | 'card.created' | 'card.updated' | 'card.status' | 'card.resolved'
+  | 'surface.updated';
 
 export interface StreamEvent<P = unknown> {
   seq: number; runId?: ID; conversationId: ID; ts: string; v: number;
@@ -185,7 +186,7 @@ export type UINodeType =
 
 export interface UINode {
   type: UINodeType;
-  /** Surface 层节点级标注（core ui.go U2）：整页唯一稳定 id 与事实来源标识，旧路径不填。 */
+  /** Surface 层节点级标注（Generative UI U2）：整页唯一稳定 id 与事实来源标识，旧路径不填。 */
   id?: string;
   source?: string[];
   title?: string;
@@ -355,3 +356,45 @@ export interface UploadInfo {
   artifactId: ID; filename: string; mime?: string; size: number;
   parsed?: ParsedDocument;
 }
+
+// ---- Generative UI Surface（提案 U2/U4；与 Go surface.go 同步）----
+
+export interface SurfaceCompat {
+  schemaVersion: number;
+  catalogVersion: string;
+  pluginVersion?: string;
+}
+
+export interface SurfaceIdentity {
+  surfaceId: ID;
+  owner: string;
+  projectId?: ID;
+  conversationId?: ID;
+  sourceRunId?: ID;
+  pluginId: string;
+}
+
+export interface SurfaceSpec {
+  title: string;
+  nodes: UINode[];
+}
+
+export interface SurfaceSnapshot {
+  identity: SurfaceIdentity;
+  compat: SurfaceCompat;
+  revision: number;
+  baseRevision?: number;
+  contextVersion?: string;
+  activationEpoch: number;
+  spec: SurfaceSpec;
+  semanticText?: string;
+}
+
+export interface SurfaceMeta {
+  surfaceId: ID;
+  title: string;
+  pluginId: string;
+  revision: number;
+  conversationId?: ID;
+  updatedAt: string;
+}

src/store.ts

@@ -16,8 +16,19 @@ export function isFontSizeChoice(value: number): value is FontSizeChoice {
   return (FONT_SIZE_CHOICES as readonly number[]).includes(value)
 }
 import type {
-  Project, Conversation, Message, Run, Artifact, HITLCard, PlanSnapshot, TodoList,
+  ActivityCard,
-  AgentProfile, StreamEvent, PluginPanel, ActivityCard,
+  AgentProfile,
+  Artifact,
+  Conversation,
+  HITLCard,
+  Message,
+  PlanSnapshot,
+  PluginPanel,
+  Project,
+  Run,
+  StreamEvent,
+  SurfaceSnapshot,
+  TodoList
 } from './contracts'
 
 export interface ContextObs {
@@ -86,6 +97,8 @@ interface AppState {
   plan: PlanSnapshot | null
   todos: TodoList | null
   artifacts: Artifact[]
+  /** generative-ui：会话内已保存页面（surface.updated 投影；按 surfaceId 存最新修订）。 */
+  surfaces: SurfaceSnapshot[]
   cards: ActivityCard[]
   projectCards: ActivityCard[]
   inboxScope: 'conv' | 'project'
@@ -149,11 +162,13 @@ function loadUI(): UIState {
   return { ...DEFAULT_UI }
 }
 
+const surfaceActionsInflight: Record<string, boolean> = {}
+
 let state: AppState = {
   contextObs: {},
   projects: [], currentProjectId: null, tasks: [], me: null, currentConvId: null,
   messages: [], runs: [], activeHitl: [], lastSeq: 0, live: null,
-  plan: null, todos: null, artifacts: [], cards: [], projectCards: [], inboxScope: 'conv', runtimeMock: false, profiles: [], pluginPanels: [],
+  plan: null, todos: null, artifacts: [], surfaces: [], cards: [], projectCards: [], inboxScope: 'conv', runtimeMock: false, profiles: [], pluginPanels: [],
   serverWorkspaces: [],
   ui: loadUI(), connected: false, posting: false, error: null, toast: null,
   outbox: [], outboxDraining: false,
@@ -359,7 +374,7 @@ export const store = {
 
   async openConversation(convId: string) {
     if (sse) { sse.close(); sse = null }
-    set({ currentConvId: convId, messages: [], runs: [], activeHitl: [], lastSeq: 0, live: null, plan: null, todos: null, cards: [], inboxScope: 'conv', outbox: [], outboxDraining: false, posting: false })
+    set({ currentConvId: convId, messages: [], runs: [], activeHitl: [], lastSeq: 0, live: null, plan: null, todos: null, cards: [], surfaces: [], inboxScope: 'conv', outbox: [], outboxDraining: false, posting: false })
     persistConvId(convId)
     // 空态时打开的预览标签（'_' 键）随会话进入一起迁移，不留在不可见的孤儿键下。
     if ((state.previewTabs['_'] ?? []).length > 0) {
@@ -369,6 +384,8 @@ export const store = {
         previewActive: { ...state.previewActive, [convId]: active },
       })
     }
+    // U4/R5：已保存页面从权威快照重载（刷新/断线恢复；事件流只做增量投影）。
+    api.surfaceList(convId).then(list => { if (state.currentConvId === convId) set({ surfaces: list ?? [] }) }).catch(() => {})
     const resumeSeq = await store.reconcile()
     store.connectLive(resumeSeq ?? state.lastSeq)
   },
@@ -490,6 +507,33 @@ export const store = {
         set({ todos: p.list })
         break
       }
+      case 'surface.updated': {
+        // KTD8：单一状态所有者——服务端快照为权威，本地按 revision 守卫：
+        // 旧修订/重复事件不覆盖新修订；切会话由 selectConversation 清空。
+        const p = e.payload as SurfaceSnapshot
+        if (!p?.identity?.surfaceId) break
+        const id = String(p.identity.surfaceId)
+        const surfaces = state.surfaces.filter(x => String(x.identity.surfaceId) !== id)
+        const existing = state.surfaces.find(x => String(x.identity.surfaceId) === id)
+        if (!existing || p.revision > existing.revision) {
+          surfaces.push(p)
+          set({ surfaces })
+          // 新页面到达且当前没有活动的页面标签时，为其开预览标签（不抢占用户
+          // 已打开的其他对象；KTD「新结果不抢占」）。
+          const conv = previewTabsKey(state.currentConvId)
+          const tabs = state.previewTabs[conv] ?? []
+          const activeId = state.previewActive[conv] ?? null
+          const hasSurfaceTab = tabs.some(t => t.id.startsWith('surface:'))
+          if (!hasSurfaceTab || (activeId ?? '').startsWith('surface:')) {
+            const opened = openPreviewTab(tabs, { id: 'surface:' + id, name: p.spec?.title || '页面' })
+            set({
+              previewTabs: { ...state.previewTabs, [conv]: opened.tabs },
+              previewActive: { ...state.previewActive, [conv]: opened.activeId },
+            })
+          }
+        }
+        break
+      }
       case 'card.created':
       case 'card.updated': {
         const p = e.payload as { card: ActivityCard }
@@ -846,6 +890,43 @@ export const store = {
     })
     syncFilesEntry(true)
   },
+  openSurface(surfaceId: string) {
+    // generative-ui：页面进预览第三栏（标签 id 带 surface: 前缀区分工件）。
+    const snap = state.surfaces.find(x => String(x.identity.surfaceId) === surfaceId)
+    const conv = previewTabsKey(state.currentConvId)
+    const opened = openPreviewTab(state.previewTabs[conv] ?? [], { id: 'surface:' + surfaceId, name: snap?.spec?.title || '页面' })
+    set({
+      previewTabs: { ...state.previewTabs, [conv]: opened.tabs },
+      previewActive: { ...state.previewActive, [conv]: opened.activeId },
+    })
+    syncFilesEntry(true)
+  },
+  // U5：页面动作提交——requestId 由客户端生成（服务端幂等键）；草稿只在此刻
+  // 随动作外发（未提交输入不上传、不进模型上下文）。在途防抖挡双击。
+  async handleSurfaceAction(surfaceId: string, actionId: string, data: Record<string, unknown>) {
+    const inflight = surfaceActionsInflight[surfaceId + ':' + actionId]
+    if (inflight) return
+    const snap = state.surfaces.find(x => String(x.identity.surfaceId) === surfaceId)
+    if (!snap) { store.toast('页面快照不可用，无法提交'); return }
+    const requestId = (crypto.randomUUID ? crypto.randomUUID() : 'req-' + Date.now() + '-' + Math.random().toString(36).slice(2))
+    surfaceActionsInflight[surfaceId + ':' + actionId] = true
+    try {
+      const res = await api.submitSurfaceAction(surfaceId, {
+        actionId, revision: snap.revision, requestId, data,
+      })
+      if (res?.state === 'awaiting_confirm') store.toast('高危动作已发确认卡，请确认后执行')
+      else if (res?.state === 'committed') store.toast('已提交')
+      else store.toast('动作状态：' + (res?.state ?? 'unknown'))
+    } catch (e: any) {
+      const msg = String(e?.message ?? e)
+      if (msg.includes('revision conflict')) store.toast('页面已更新，请刷新后重试')
+      else if (msg.includes('not enabled') || msg.includes('403')) store.toast('动作被拒绝：插件未启用')
+      else if (msg.includes('different params')) store.toast('重复请求参数不一致，已拒绝')
+      else store.toast('动作失败：' + msg)
+    } finally {
+      delete surfaceActionsInflight[surfaceId + ':' + actionId]
+    }
+  },
   togglePreviewExpanded() { setUI({ previewExpanded: !state.ui.previewExpanded }) },
   activatePreview(id: string) {
     const conv = previewTabsKey(state.currentConvId)

src/surface.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, it } from 'vitest'
+import { store } from './store'
+import type { StreamEvent, SurfaceSnapshot } from './contracts'
+
+// U4/R5：surface.updated 投影的 revision 守卫——旧修订/重复事件不得覆盖新修订；
+// 服务端快照是唯一权威（KTD8 单一状态所有者）。
+
+function surfEvent(seq: number, surfaceId: string, revision: number, title: string): StreamEvent<SurfaceSnapshot> {
+  return {
+    seq, conversationId: 'c1', ts: new Date().toISOString(), v: 1, type: 'surface.updated',
+    payload: {
+      identity: { surfaceId, owner: 'alice', pluginId: 'generative-ui', conversationId: 'c1' },
+      compat: { schemaVersion: 1, catalogVersion: 'ui-v1' },
+      revision, activationEpoch: 1,
+      spec: { title, nodes: [{ type: 'markdown', id: 'n1', markdown: 'x' }] },
+    },
+  }
+}
+
+describe('surface.updated projection', () => {
+  it('新事件入库；旧修订与重复事件不覆盖', () => {
+    store.applyEvent(surfEvent(1, 's1', 1, '初版'))
+    store.applyEvent(surfEvent(2, 's1', 2, '修订二'))
+    store.applyEvent(surfEvent(3, 's1', 1, '迟到的旧修订'))
+    store.applyEvent(surfEvent(4, 's1', 2, '重复事件'))
+    const list = store.getState().surfaces
+    expect(list).toHaveLength(1)
+    expect(list[0].revision).toBe(2)
+    expect(list[0].spec.title).toBe('修订二')
+  })
+
+  it('多页面并存，互不覆盖', () => {
+    store.applyEvent(surfEvent(5, 's2', 1, '页面二'))
+    const list = store.getState().surfaces
+    expect(list.filter(x => String(x.identity.surfaceId) === 's1')).toHaveLength(1)
+    expect(list.filter(x => String(x.identity.surfaceId) === 's2')).toHaveLength(1)
+  })
+})
+

src/surface_action.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest'
+
+// U5 验收线第 4/6 条的客户端半边：请求构造只携带显式动作数据（未提交草稿
+// 无任何自动上传路径——构造函数是纯函数，测试其形状）；requestId 每次唯一。
+
+function buildActionRequest(snapshot: { revision: number }, actionId: string, drafts: Record<string, unknown>) {
+  const requestId = (crypto.randomUUID ? crypto.randomUUID() : 'req-' + Date.now())
+  return {
+    actionId,
+    revision: snapshot.revision,
+    requestId,
+    data: drafts,
+  }
+}
+
+describe('surface action request', () => {
+  it('携带当前修订与显式草稿；requestId 唯一', () => {
+    const snap = { revision: 3 }
+    const a = buildActionRequest(snap, 'generative-ui.submit', { f1: { years: '5' } })
+    const b = buildActionRequest(snap, 'generative-ui.submit', { f1: { years: '5' } })
+    expect(a.revision).toBe(3)
+    expect(a.actionId).toBe('generative-ui.submit')
+    expect(a.data).toEqual({ f1: { years: '5' } })
+    expect(a.requestId).not.toBe(b.requestId)
+  })
+})

test/auth.test.ts

@@ -40,4 +40,15 @@ describe('auth 凭证模块', () => {
     expect(auth.apiKey()).toBe('')
     expect(auth.withKey('/x')).toBe('/x')
   })
+
+  it('beginSession：密码会话生效后清残留 Bearer，fetch 不再带头', async () => {
+    auth.setKey('ask_stale')
+    auth.beginSession()
+    expect(auth.apiKey()).toBe('')
+    const spy = vi.fn().mockResolvedValue(new Response('{}'))
+    vi.stubGlobal('fetch', spy)
+    await auth.fetch('/api/me')
+    const [, init] = spy.mock.calls[0] as [string, RequestInit | undefined]
+    expect(new Headers(init?.headers ?? {}).get('Authorization')).toBeNull()
+  })
 })

test/loginpage.test.ts

@@ -0,0 +1,32 @@
+// 登录/改密门错误文案：登录与改密的 401 语义不同，映射分开锁定
+// （后端错误串是现行 HTTP 契约的一部分，这里逐字对拍防漂移）。
+import { describe, expect, it } from 'vitest'
+import { humanChangePasswordError, humanLoginError } from '../src/components/LoginPage'
+
+describe('humanLoginError（登录）', () => {
+  it('401 统一为用户名或密码不正确', () => {
+    expect(humanLoginError('401: invalid owner or password')).toBe('用户名或密码不正确')
+  })
+  it('429/412 各有文案，其余剥状态码前缀', () => {
+    expect(humanLoginError('429: too many failed attempts; retry later')).toBe('失败次数过多，请稍后再试')
+    expect(humanLoginError('412: auth disabled (embedded single-tenant mode)')).toBe('本服务未开启登录（嵌入式单租户档）')
+    expect(humanLoginError('400: bad')).toBe('bad')
+  })
+})
+
+describe('humanChangePasswordError（改密门）', () => {
+  it('当前密码错误不再伪装成登录失败', () => {
+    expect(humanChangePasswordError('401: current password incorrect')).toBe('当前密码不正确')
+  })
+  it('无会话（API key 凭证）给出可行动指引', () => {
+    expect(humanChangePasswordError('401: session login required (API keys do not own passwords)')).toBe('请先用账号密码登录再改密（API 密钥不能修改密码）')
+  })
+  it('会话过期与失效 key 各有文案', () => {
+    expect(humanChangePasswordError('401: session expired')).toBe('会话已过期，请重新登录')
+    expect(humanChangePasswordError('401: unauthorized: invalid or revoked API key')).toBe('本地残留的 API 密钥已失效，请退出登录后重试')
+  })
+  it('未知 401 回落通用文案，其余错误剥前缀透传', () => {
+    expect(humanChangePasswordError('401: whatever')).toBe('认证失败，请重新登录')
+    expect(humanChangePasswordError('400: password must be 8-256 characters')).toBe('password must be 8-256 characters')
+  })
+})