fix: normalize workbench frontend projection

web/hwlab-cloud-web/scripts/workbench-r2-session-parity.test.ts

@@ -4,13 +4,15 @@ import test from "node:test";
 import type { ChatMessage, ConversationRecord, WorkspaceRecord } from "../src/types/index.ts";
 import { defaultProviderProfileOptions, mergeConversationIntoList, normalizeChatMessageStatus, normalizeRecentDrafts, normalizeWorkbenchMessageTitle, providerProfileOptionsFromPayload, recordRecentDraft, resolveCancelableAgentMessage, resolveComposerState, shouldApplyWorkspaceSnapshot, shouldShowSessionListLoading, sortSessionTabs, stableConversationList, workspaceWithClearedActiveTrace } from "../src/stores/workbench-session.ts";
 
-test("R2 composer ignores stale workspace activeTraceId without verified active message", () => {
+test("R2 composer ignores stale workspace activeTraceId and workspace session without verified active projection", () => {
   const workspace = workspaceRecord({ activeTraceId: "trc_stale", sessionStatus: "running" });
   const composer = resolveComposerState({ workspace, messages: [], conversations: [], activeConversationId: "cnv_r2", chatPending: false });
+  assert.equal(composer.disabled, true);
+  assert.equal(composer.disabledReason, "session_required");
   assert.equal(composer.submitMode, "turn");
   assert.equal(composer.route, "/v1/agent/chat");
   assert.equal(composer.targetTraceId, null);
-  assert.equal(composer.sessionId, "ses_r2");
+  assert.equal(composer.sessionId, null);
 });
 
 test("R2 composer steers only when an active agent message or status exists", () => {

web/hwlab-cloud-web/scripts/workbench-server-state.test.ts

@@ -0,0 +1,38 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import type { ConversationRecord, WorkspaceRecord } from "../src/types/index.ts";
+import { initialWorkbenchConversationIdFromLocation, nextExplicitWorkbenchConversationId, resolveWorkbenchActiveConversationId } from "../src/stores/workbench-projection.ts";
+import { createWorkbenchServerState, reduceWorkbenchServerState, selectActiveConversation, selectActiveMessages, selectTraceAuthorityById } from "../src/stores/workbench-server-state.ts";
+
+test("R5 active conversation comes only from route or explicit UI selection", () => {
+  assert.equal(resolveWorkbenchActiveConversationId({ switchingConversationId: null, explicitConversationId: "cnv_route" }), "cnv_route");
+  assert.equal(resolveWorkbenchActiveConversationId({ switchingConversationId: "cnv_switching", explicitConversationId: "cnv_route" }), "cnv_switching");
+  assert.equal(resolveWorkbenchActiveConversationId({ switchingConversationId: null, explicitConversationId: null }), null);
+});
+
+test("R5 initial route parsing ignores workspace fallback", () => {
+  assert.equal(initialWorkbenchConversationIdFromLocation({ pathname: "/workbench/sessions/cnv_route" }), "cnv_route");
+  assert.equal(initialWorkbenchConversationIdFromLocation({ pathname: "/workbench" }), null);
+  assert.equal(nextExplicitWorkbenchConversationId("cnv_existing", "not-a-conversation"), "cnv_existing");
+});
+
+test("R5 late workspace and trace snapshots update cache without changing active projection", () => {
+  const workspace: WorkspaceRecord = { workspaceId: "wsp_r5", projectId: "prj_hwpod_workbench", selectedConversationId: "cnv_late" };
+  const routeConversation: ConversationRecord = { conversationId: "cnv_route", sessionId: "ses_route", messages: [{ id: "msg_route", messageId: "msg_route", role: "user", title: "用户", text: "route prompt", status: "sent", createdAt: "2026-06-17T00:00:00.000Z", conversationId: "cnv_route" }] };
+  const lateConversation: ConversationRecord = { conversationId: "cnv_late", sessionId: "ses_late", messages: [{ id: "msg_late", messageId: "msg_late", role: "agent", title: "Code Agent", text: "late reply", status: "completed", createdAt: "2026-06-17T00:00:01.000Z", conversationId: "cnv_late", traceId: "trc_late" }] };
+  let state = createWorkbenchServerState();
+  const active = "cnv_route";
+
+  state = reduceWorkbenchServerState(state, { type: "workspace.snapshot", projectId: "prj_hwpod_workbench", workspace });
+  state = reduceWorkbenchServerState(state, { type: "conversation.detail", conversation: lateConversation });
+  state = reduceWorkbenchServerState(state, { type: "trace.snapshot", traceId: "trc_late", trace: { traceId: "trc_late", status: "completed", events: [{ seq: 1, type: "late" }] } });
+
+  assert.equal(selectActiveConversation(state, active), null);
+  assert.deepEqual(selectActiveMessages(state, active), []);
+  assert.equal(selectTraceAuthorityById(state).trc_late?.traceId, "trc_late");
+
+  state = reduceWorkbenchServerState(state, { type: "conversation.detail", conversation: routeConversation });
+  assert.equal(selectActiveConversation(state, active)?.conversationId, "cnv_route");
+  assert.deepEqual(selectActiveMessages(state, active).map((message) => message.id), ["msg_route"]);
+});

web/hwlab-cloud-web/src/stores/workbench-projection.ts

@@ -0,0 +1,28 @@
+// SPEC: PJ2026-010403 API契约 draft-2026-06-17-r0; PJ2026-010401 Web工作台 draft-2026-06-17-r0.
+// Responsibility: Workbench UI projection helpers that keep route/explicit selection separate from server snapshots.
+
+import { firstNonEmptyString, normalizeWorkbenchConversationId } from "@/utils";
+
+export interface WorkbenchActiveConversationInput {
+  switchingConversationId?: string | null;
+  explicitConversationId?: string | null;
+}
+
+export function resolveWorkbenchActiveConversationId(input: WorkbenchActiveConversationInput): string | null {
+  return firstNonEmptyString(input.switchingConversationId, input.explicitConversationId);
+}
+
+export function initialWorkbenchConversationIdFromLocation(location: Pick<Location, "pathname"> | null = typeof window === "undefined" ? null : window.location): string | null {
+  const pathname = location?.pathname ?? "";
+  const match = /^\/(?:workbench|workspace)\/sessions\/([^/?#]+)/u.exec(pathname);
+  if (!match?.[1]) return null;
+  try {
+    return normalizeWorkbenchConversationId(decodeURIComponent(match[1]));
+  } catch {
+    return normalizeWorkbenchConversationId(match[1]);
+  }
+}
+
+export function nextExplicitWorkbenchConversationId(current: string | null, candidate: string | null | undefined): string | null {
+  return normalizeWorkbenchConversationId(candidate) ?? current;
+}

web/hwlab-cloud-web/src/stores/workbench-server-state.ts

@@ -0,0 +1,96 @@
+// SPEC: PJ2026-010403 API契约 draft-2026-06-17-r0; PJ2026-010401 Web工作台 draft-2026-06-17-r0.
+// Responsibility: Normalized Workbench server-state reducer for workspace, conversation, session, turn, and trace caches.
+
+import type { ChatMessage, ConversationRecord, WorkspaceRecord } from "@/types";
+import type { SessionStatusAuthority, TurnStatusAuthority } from "./workbench-session";
+
+export interface WorkbenchServerState {
+  workspaceByProjectId: Record<string, WorkspaceRecord | null>;
+  conversationsById: Record<string, ConversationRecord>;
+  messagesByConversationId: Record<string, ChatMessage[]>;
+  sessionStatusById: Record<string, SessionStatusAuthority>;
+  turnStatusByTraceId: Record<string, TurnStatusAuthority>;
+  traceById: Record<string, NonNullable<ChatMessage["runnerTrace"]>>;
+}
+
+export type WorkbenchServerAction =
+  | { type: "workspace.snapshot"; projectId: string; workspace: WorkspaceRecord | null }
+  | { type: "conversation.list"; conversations: ConversationRecord[] }
+  | { type: "conversation.detail"; conversation: ConversationRecord | null | undefined }
+  | { type: "session.status"; session: SessionStatusAuthority }
+  | { type: "session.forget"; sessionId: string }
+  | { type: "turn.status"; turn: TurnStatusAuthority }
+  | { type: "turn.forget"; traceId: string }
+  | { type: "trace.snapshot"; traceId: string; trace: NonNullable<ChatMessage["runnerTrace"]> };
+
+export function createWorkbenchServerState(): WorkbenchServerState {
+  return {
+    workspaceByProjectId: {},
+    conversationsById: {},
+    messagesByConversationId: {},
+    sessionStatusById: {},
+    turnStatusByTraceId: {},
+    traceById: {}
+  };
+}
+
+export function reduceWorkbenchServerState(state: WorkbenchServerState, action: WorkbenchServerAction): WorkbenchServerState {
+  switch (action.type) {
+    case "workspace.snapshot":
+      return { ...state, workspaceByProjectId: { ...state.workspaceByProjectId, [action.projectId]: action.workspace } };
+    case "conversation.list":
+      return action.conversations.reduce((next, conversation) => reduceWorkbenchServerState(next, { type: "conversation.detail", conversation }), state);
+    case "conversation.detail":
+      return reduceConversationDetail(state, action.conversation);
+    case "session.status":
+      return { ...state, sessionStatusById: { ...state.sessionStatusById, [action.session.sessionId]: action.session } };
+    case "session.forget":
+      return { ...state, sessionStatusById: withoutKey(state.sessionStatusById, action.sessionId) };
+    case "turn.status":
+      return { ...state, turnStatusByTraceId: { ...state.turnStatusByTraceId, [action.turn.traceId]: action.turn } };
+    case "turn.forget":
+      return { ...state, turnStatusByTraceId: withoutKey(state.turnStatusByTraceId, action.traceId) };
+    case "trace.snapshot":
+      return { ...state, traceById: { ...state.traceById, [action.traceId]: action.trace } };
+  }
+}
+
+export function selectSessionStatusAuthority(state: WorkbenchServerState): Readonly<Record<string, SessionStatusAuthority>> {
+  return state.sessionStatusById;
+}
+
+export function selectTurnStatusAuthority(state: WorkbenchServerState): Readonly<Record<string, TurnStatusAuthority>> {
+  return state.turnStatusByTraceId;
+}
+
+export function selectTraceAuthorityById(state: WorkbenchServerState): Readonly<Record<string, NonNullable<ChatMessage["runnerTrace"]>>> {
+  return state.traceById;
+}
+
+export function selectActiveConversation(state: WorkbenchServerState, conversationId: string | null): ConversationRecord | null {
+  return conversationId ? state.conversationsById[conversationId] ?? null : null;
+}
+
+export function selectActiveMessages(state: WorkbenchServerState, conversationId: string | null): ChatMessage[] {
+  return conversationId ? state.messagesByConversationId[conversationId] ?? [] : [];
+}
+
+function reduceConversationDetail(state: WorkbenchServerState, conversation: ConversationRecord | null | undefined): WorkbenchServerState {
+  const conversationId = conversation?.conversationId;
+  if (!conversationId || !conversation) return state;
+  return {
+    ...state,
+    conversationsById: { ...state.conversationsById, [conversationId]: conversation },
+    messagesByConversationId: {
+      ...state.messagesByConversationId,
+      [conversationId]: Array.isArray(conversation.messages) ? conversation.messages : state.messagesByConversationId[conversationId] ?? []
+    }
+  };
+}
+
+function withoutKey<T>(source: Record<string, T>, key: string): Record<string, T> {
+  if (!(key in source)) return source;
+  const next = { ...source };
+  delete next[key];
+  return next;
+}

web/hwlab-cloud-web/src/stores/workbench-session.ts

@@ -71,20 +71,15 @@ const BUILTIN_PROVIDER_PROFILE_LABELS: Readonly<Record<string, string>> = Object
 export function resolveComposerState(input: { workspace: WorkspaceRecord | null; messages: ChatMessage[]; conversations?: ConversationRecord[]; activeConversationId: string | null; chatPending: boolean; currentRequest?: { traceId?: string | null; conversationId?: string | null; sessionId?: string | null; threadId?: string | null; status?: string | null } | null; turnStatusAuthority?: TurnStatusAuthorityMap }): ComposerState {
   const latestMessage = latestConversationMessage(input.messages, input.activeConversationId);
   const currentRequest = input.currentRequest && input.currentRequest.conversationId === input.activeConversationId ? input.currentRequest : null;
-  const workspaceTraceId = firstNonEmptyString(input.workspace?.activeTraceId, input.workspace?.workspace?.activeTraceId);
   const latestTraceId = firstNonEmptyString(latestMessage?.traceId, latestMessage?.runnerTrace?.traceId);
-  const activeTraceId = firstNonEmptyString(currentRequest?.traceId, workspaceTraceId, latestTraceId);
+  const activeTraceId = firstNonEmptyString(currentRequest?.traceId, latestTraceId);
   const turn = activeTraceId ? input.turnStatusAuthority?.[activeTraceId] : null;
   const activeByStatus = turn?.running === true || isActiveStatus(turn?.status);
   const terminal = turn?.terminal === true || isTerminalStatus(turn?.status);
   const conversationId = input.activeConversationId;
   const active = activeConversation(input.conversations ?? [], conversationId);
-  const workspaceConversationId = selectedConversationIdFromWorkspace(input.workspace);
-  const workspaceMatchesConversation = !conversationId || !workspaceConversationId || workspaceConversationId === conversationId;
-  const workspaceSessionId = workspaceMatchesConversation ? firstNonEmptyString(input.workspace?.selectedAgentSessionId, input.workspace?.workspace?.selectedAgentSessionId) : null;
-  const workspaceThreadId = workspaceMatchesConversation ? firstNonEmptyString(input.workspace?.workspace?.threadId) : null;
-  const sessionId = firstNonEmptyString(turn?.sessionId, currentRequest?.sessionId, active?.sessionId, workspaceSessionId);
-  const threadId = firstNonEmptyString(turn?.threadId, currentRequest?.threadId, active?.threadId, workspaceThreadId);
+  const sessionId = firstNonEmptyString(turn?.sessionId, currentRequest?.sessionId, active?.sessionId);
+  const threadId = firstNonEmptyString(turn?.threadId, currentRequest?.threadId, active?.threadId);
   const canSteer = Boolean(conversationId && sessionId && activeTraceId && activeByStatus && !terminal);
   if (canSteer) return { disabled: false, disabledReason: null, submitMode: "steer", route: "/v1/agent/chat/steer", targetTraceId: activeTraceId, conversationId, sessionId, threadId };
   if (!sessionId) return { disabled: true, disabledReason: "session_required", submitMode: "turn", route: "/v1/agent/chat", targetTraceId: null, conversationId, sessionId: null, threadId };

web/hwlab-cloud-web/src/stores/workbench.ts

@@ -8,7 +8,9 @@ import { connectWorkbenchEvents, type WorkbenchEventStream, type WorkbenchRealti
 import { mergeRunnerTrace, snapshotToRunnerTrace, type TraceSnapshot } from "@/composables/useTraceSubscription";
 import type { AgentChatResponse, AgentChatResultResponse, AgentRunProvenance, ApiResult, ChatMessage, ConversationRecord, LiveSurface, ProviderProfile, TraceEvent, WorkspaceRecord } from "@/types";
 import { DEFAULT_WORKBENCH_PROJECT_ID, firstNonEmptyString, nextProtocolId, normalizeWorkbenchConversationId, rememberWorkbenchProjectId, resolveInitialWorkbenchProjectId, workspaceProjectId } from "@/utils";
-import { RECENT_DRAFTS_STORAGE_KEY, activeTraceIdFromWorkspace, defaultProviderProfileOptions, mergeConversationIntoList, normalizeChatMessageStatus, normalizeRecentDrafts, normalizeWorkbenchMessageTitle, providerProfileOptionsFromPayload, recordRecentDraft, resolveCancelableAgentMessage, resolveComposerState, selectedConversationIdFromWorkspace, shouldApplyWorkspaceSnapshot, shouldShowSessionListLoading, sortSessionTabs, stableConversationList, workspaceWithClearedActiveTrace, type DraftEntry, type ProviderProfileOption, type SessionStatusAuthority, type TurnStatusAuthority } from "./workbench-session";
+import { RECENT_DRAFTS_STORAGE_KEY, defaultProviderProfileOptions, mergeConversationIntoList, normalizeChatMessageStatus, normalizeRecentDrafts, normalizeWorkbenchMessageTitle, providerProfileOptionsFromPayload, recordRecentDraft, resolveCancelableAgentMessage, resolveComposerState, selectedConversationIdFromWorkspace, shouldApplyWorkspaceSnapshot, shouldShowSessionListLoading, sortSessionTabs, stableConversationList, workspaceWithClearedActiveTrace, type DraftEntry, type ProviderProfileOption, type SessionStatusAuthority, type TurnStatusAuthority } from "./workbench-session";
+import { initialWorkbenchConversationIdFromLocation, nextExplicitWorkbenchConversationId, resolveWorkbenchActiveConversationId } from "./workbench-projection";
+import { createWorkbenchServerState, reduceWorkbenchServerState, selectSessionStatusAuthority, selectTraceAuthorityById, selectTurnStatusAuthority, type WorkbenchServerAction } from "./workbench-server-state";
 
 const DEFAULT_CODE_AGENT_TIMEOUT_MS = 1_800_000;
 const DEFAULT_GATEWAY_TIMEOUT_MS = 120_000;
@@ -40,10 +42,12 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   const error = ref<string | null>(null);
   const activityRef = ref({ lastActivityAt: Date.now(), lastActivityIso: new Date().toISOString(), waitingFor: "idle", lastEventLabel: null as string | null });
   const currentRequest = ref<{ traceId: string; conversationId: string | null; sessionId: string | null; threadId: string | null; status?: string | null } | null>(null);
+  const explicitConversationId = ref<string | null>(initialWorkbenchConversationIdFromLocation());
   const workspaceSelectionEpoch = ref(0);
-  const sessionStatusAuthority = ref<Record<string, SessionStatusAuthority>>({});
-  const turnStatusAuthority = ref<Record<string, TurnStatusAuthority>>({});
-  const traceAuthorityById = ref<Record<string, NonNullable<ChatMessage["runnerTrace"]>>>({});
+  const serverState = ref(createWorkbenchServerState());
+  const sessionStatusAuthority = computed(() => selectSessionStatusAuthority(serverState.value));
+  const turnStatusAuthority = computed(() => selectTurnStatusAuthority(serverState.value));
+  const traceAuthorityById = computed(() => selectTraceAuthorityById(serverState.value));
   const traceHydrationInFlight = new Set<string>();
   const terminalRealtimeRefreshInFlight = new Set<string>();
   let realtimeStream: WorkbenchEventStream | null = null;
@@ -51,10 +55,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   let realtimeGapTimer: number | null = null;
 
   const visibleConversations = computed(() => conversations.value);
-  const activeConversationId = computed(() => firstNonEmptyString(switchingConversationId.value, workspace.value?.selectedConversationId, workspace.value?.workspace?.selectedConversationId, messages.value.find((message) => message.conversationId)?.conversationId));
-  const selectedSessionId = computed(() => firstNonEmptyString(workspace.value?.selectedAgentSessionId, workspace.value?.workspace?.selectedAgentSessionId, activeConversation.value?.sessionId));
-  const selectedThreadId = computed(() => firstNonEmptyString(workspace.value?.workspace?.threadId, activeConversation.value?.threadId));
+  const activeConversationId = computed(() => resolveWorkbenchActiveConversationId({ switchingConversationId: switchingConversationId.value, explicitConversationId: explicitConversationId.value }));
   const activeConversation = computed(() => visibleConversations.value.find((item) => item.conversationId === activeConversationId.value) ?? null);
+  const selectedSessionId = computed(() => firstNonEmptyString(activeConversation.value?.sessionId));
+  const selectedThreadId = computed(() => firstNonEmptyString(activeConversation.value?.threadId));
   const sessionTabs = computed(() => sortSessionTabs(visibleConversations.value, activeConversationId.value, sessionStatusAuthority.value));
   const sessionListLoading = computed(() => shouldShowSessionListLoading({ loading: loading.value, conversationsReady: conversationsReady.value }));
   const conversationDetailLoading = computed(() => Boolean(conversationDetailLoadingId.value || switchingConversationId.value || (loading.value && messages.value.length === 0)));
@@ -67,9 +71,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   async function hydrate(options: HydrateOptions = {}): Promise<void> {
+    const routeConversationId = normalizeWorkbenchConversationId(options.conversationId);
+    if (routeConversationId) setActiveConversationSelection(routeConversationId);
     const requestEpoch = workspaceSelectionEpoch.value;
     const previousConversationId = activeConversationId.value;
-    const routeConversationId = normalizeWorkbenchConversationId(options.conversationId);
     if (routeConversationId) conversationDetailLoadingId.value = routeConversationId;
     conversationsReady.value = conversations.value.length > 0;
     loading.value = true;
@@ -83,13 +88,17 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     }
     const nextWorkspace = workspaceResult.data?.workspace ?? null;
     const nextProjectId = workspaceProjectId(nextWorkspace, projectId.value);
+    rememberWorkspaceSnapshot(nextProjectId, nextWorkspace);
     projectId.value = nextProjectId;
-    const selectedConversationId = routeConversationId ?? selectedConversationIdFromWorkspace(nextWorkspace);
+    const selectedConversationId = routeConversationId ?? activeConversationId.value ?? selectedConversationIdFromWorkspace(nextWorkspace);
+    bootstrapActiveConversationSelection(selectedConversationId);
     const conversationsPromise = api.workbench.conversations(nextProjectId, { includeConversationId: selectedConversationId });
     if (selectedConversationId) conversationDetailLoadingId.value = selectedConversationId;
     const selectedConversationResult = selectedConversationId ? await api.workbench.conversation(selectedConversationId, { projectId: nextProjectId }) : null;
     clearConversationDetailLoading(selectedConversationId);
     const selectedConversation = selectedConversationResult?.ok ? selectedConversationResult.data?.conversation ?? null : null;
+    rememberConversationDetail(selectedConversation);
+    if (selectedConversation) conversations.value = mergeConversationIntoList(conversations.value, selectedConversation);
     if (selectedConversationId && selectedConversationResult && !selectedConversationResult.ok) error.value = selectedConversationResult.error ?? "conversation unavailable";
     const workspaceSnapshot = selectedConversation
       ? workspaceWithSelectedConversation(nextWorkspace, selectedConversation, conversationProjectId(selectedConversation, nextProjectId))
@@ -98,6 +107,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
         : nextWorkspace;
     if (shouldApplyWorkspaceSnapshot({ requestEpoch, currentEpoch: workspaceSelectionEpoch.value, currentConversationId: activeConversationId.value, workspace: workspaceSnapshot })) {
       workspace.value = workspaceSnapshot;
+      rememberWorkspaceSnapshot(nextProjectId, workspaceSnapshot);
       providerProfile.value = firstNonEmptyString(workspace.value?.providerProfile, workspace.value?.workspace?.providerProfile, providerProfile.value) ?? providerProfile.value;
       rememberWorkbenchProjectId(workspaceProjectId(workspace.value, nextProjectId));
       messages.value = restoreMessagesTraceAuthority(messagesFromSelectedConversation(selectedConversation, selectedConversationId, previousConversationId, messages.value), messages.value);
@@ -112,12 +122,14 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     if (conversationsResult.ok) {
       nextConversations = stableConversationList(conversations.value, conversationsResult.data?.conversations, selectedConversationId, selectedConversation);
       conversations.value = nextConversations;
+      rememberConversationList(nextConversations);
       conversationsReady.value = true;
       void refreshSessionStatusAuthority(nextConversations);
     } else {
       if (selectedConversation) {
         nextConversations = mergeConversationIntoList(nextConversations, selectedConversation);
         conversations.value = nextConversations;
+        rememberConversationDetail(selectedConversation);
       }
       conversationsReady.value = conversations.value.length > 0;
       error.value = conversations.value.length > 0 ? null : conversationsResult.error ?? "session list unavailable";
@@ -147,6 +159,9 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     loading.value = false;
     if (response.ok && isCurrentWorkspaceSelection(requestEpoch)) {
       workspace.value = response.data?.workspace ?? current;
+      rememberWorkspaceSnapshot(activeProjectId.value, workspace.value);
+      setActiveConversationSelection(selectedConversationIdFromWorkspace(workspace.value));
+      rememberConversationDetail(workspace.value?.selectedConversation);
       messages.value = restoreMessagesTraceAuthority(messagesFromWorkspace(workspace.value), messages.value);
       currentRequest.value = null;
       void hydrateTurnStatusAuthority(messages.value);
@@ -163,10 +178,13 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const requestEpoch = beginWorkspaceSelection();
     const tabProjectId = conversation.projectId ?? activeProjectId.value;
     switchingConversationId.value = conversation.conversationId;
+    setActiveConversationSelection(conversation.conversationId);
     conversationDetailLoadingId.value = conversation.conversationId;
     conversations.value = mergeConversationIntoList(conversations.value, conversation);
+    rememberConversationDetail(conversation);
     conversationsReady.value = true;
     workspace.value = optimisticWorkspaceSelection(current, conversation, tabProjectId);
+    rememberWorkspaceSnapshot(tabProjectId, workspace.value);
     void refreshSessionStatusById(sessionIdFromConversation(conversation));
     loading.value = true;
     const persistPromise = api.workbench.selectConversation(current.workspaceId, { projectId: tabProjectId, conversationId: conversation.conversationId, sessionId: conversation.sessionId, threadId: conversation.threadId, updatedByClient: "cloud-web-vue" });
@@ -197,6 +215,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
       error.value = "invalid session URL";
       return false;
     }
+    setActiveConversationSelection(normalized);
     const current = await ensureWorkspace();
     if (!current) return false;
     if (activeConversationId.value === normalized && messages.value.length > 0) return true;
@@ -233,6 +252,9 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const response = await api.workbench.deleteConversation(conversationId, { projectId: activeProjectId.value, workspaceId: workspace.value?.workspaceId, updatedByClient: "cloud-web-vue" });
     if (response.ok) {
       workspace.value = response.data?.workspace ?? workspace.value;
+      rememberWorkspaceSnapshot(activeProjectId.value, workspace.value);
+      replaceActiveConversationSelection(selectedConversationIdFromWorkspace(workspace.value));
+      rememberConversationDetail(workspace.value?.selectedConversation);
       messages.value = restoreMessagesTraceAuthority(messagesFromWorkspace(workspace.value), messages.value);
       currentRequest.value = null;
       void hydrateTurnStatusAuthority(messages.value);
@@ -244,6 +266,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const response = await api.workbench.conversations(activeProjectId.value, { includeConversationId });
     if (response.ok) {
       conversations.value = stableConversationList(conversations.value, response.data?.conversations, includeConversationId, activeConversation.value);
+      rememberConversationList(conversations.value);
       conversationsReady.value = true;
       await refreshSessionStatusAuthority(conversations.value);
       return;
@@ -252,6 +275,34 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     if (conversations.value.length === 0) error.value = response.error ?? "session list unavailable";
   }
 
+  function reduceServerState(action: WorkbenchServerAction): void {
+    serverState.value = reduceWorkbenchServerState(serverState.value, action);
+  }
+
+  function rememberWorkspaceSnapshot(snapshotProjectId: string, snapshot: WorkspaceRecord | null): void {
+    reduceServerState({ type: "workspace.snapshot", projectId: snapshotProjectId, workspace: snapshot });
+  }
+
+  function rememberConversationDetail(conversation: ConversationRecord | null | undefined): void {
+    reduceServerState({ type: "conversation.detail", conversation });
+  }
+
+  function rememberConversationList(source: ConversationRecord[]): void {
+    reduceServerState({ type: "conversation.list", conversations: source });
+  }
+
+  function setActiveConversationSelection(conversationId: string | null | undefined): void {
+    explicitConversationId.value = nextExplicitWorkbenchConversationId(explicitConversationId.value, conversationId);
+  }
+
+  function replaceActiveConversationSelection(conversationId: string | null | undefined): void {
+    explicitConversationId.value = normalizeWorkbenchConversationId(conversationId);
+  }
+
+  function bootstrapActiveConversationSelection(conversationId: string | null | undefined): void {
+    if (!explicitConversationId.value) setActiveConversationSelection(conversationId);
+  }
+
   async function refreshSessionStatusAuthority(source: ConversationRecord[] = conversations.value): Promise<void> {
     await Promise.all(uniqueSessionIds(source).map((sessionId) => refreshSessionStatusById(sessionId)));
   }
@@ -259,9 +310,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   async function refreshSelectedSessionStatus(fallbackConversation?: ConversationRecord | null): Promise<void> {
     await refreshSessionStatusById(firstNonEmptyString(
       fallbackConversation ? sessionIdFromConversation(fallbackConversation) : null,
-      selectedSessionId.value,
-      workspace.value?.selectedAgentSessionId,
-      workspace.value?.workspace?.selectedAgentSessionId
+      selectedSessionId.value
     ));
   }
 
@@ -271,23 +320,21 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const response = await api.agent.getAgentSession(id);
     const session = response.data?.session && typeof response.data.session === "object" ? response.data.session : null;
     if (!response.ok || !session) {
-      const next = { ...sessionStatusAuthority.value };
-      delete next[id];
-      sessionStatusAuthority.value = next;
+      reduceServerState({ type: "session.forget", sessionId: id });
       return;
     }
     const returnedSessionId = firstNonEmptyString(session.sessionId, id);
     if (returnedSessionId !== id) return;
-    sessionStatusAuthority.value = {
-      ...sessionStatusAuthority.value,
-      [id]: {
+    reduceServerState({
+      type: "session.status",
+      session: {
         sessionId: id,
         status: firstNonEmptyString(session.status) ?? null,
         updatedAt: firstNonEmptyString(session.updatedAt) ?? null,
         lastTraceId: firstNonEmptyString(session.lastTraceId) ?? null,
         loadedAt: new Date().toISOString()
       }
-    };
+    });
   }
 
   async function hydrateTurnStatusAuthority(source: ChatMessage[] = messages.value): Promise<void> {
@@ -302,9 +349,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
       applyTurnStatusSnapshot(id, response.data);
       return;
     }
-    const next = { ...turnStatusAuthority.value };
-    delete next[id];
-    turnStatusAuthority.value = next;
+    reduceServerState({ type: "turn.forget", traceId: id });
   }
 
   function applyTurnStatusSnapshot(traceId: string, result: AgentChatResultResponse | TraceSnapshot): void {
@@ -318,9 +363,9 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const status = normalizedStatusText(result.status) ?? null;
     const running = (result as AgentChatResultResponse).running === true || isTraceActiveStatus(status);
     const terminal = (result as AgentChatResultResponse).terminal === true || isTerminalMessageStatus(status);
-    turnStatusAuthority.value = {
-      ...turnStatusAuthority.value,
-      [id]: {
+    reduceServerState({
+      type: "turn.status",
+      turn: {
         traceId: id,
         status,
         running,
@@ -331,7 +376,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
         updatedAt: firstNonEmptyString((result as AgentChatResultResponse).updatedAt) ?? null,
         loadedAt: new Date().toISOString()
       }
-    };
+    });
   }
 
   function syncTurnStatusToMessage(traceId: string, result: AgentChatResultResponse | TraceSnapshot): void {
@@ -364,6 +409,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const traceId = steerMode && composer.value.targetTraceId ? composer.value.targetTraceId : nextProtocolId("trc");
     const steerTraceId = steerMode ? nextProtocolId("trc_steer") : null;
     const conversationId = activeConversationId.value ?? nextProtocolId("cnv");
+    setActiveConversationSelection(conversationId);
     const sessionId = composer.value.sessionId;
     const threadId = composer.value.threadId;
     const user = makeMessage("user", value, "sent", { traceId: steerTraceId ?? traceId, conversationId, sessionId, threadId, title: steerMode ? "用户引导" : "用户" });
@@ -495,7 +541,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const existing = traceAuthorityById.value[traceId] ?? null;
     if (trace.eventSource !== "trace-api" && !traceHasEvents(trace) && !existing) return;
     const nextTrace = mergeRunnerTrace(existing, trace as NonNullable<ChatMessage["runnerTrace"]>);
-    traceAuthorityById.value = { ...traceAuthorityById.value, [traceId]: nextTrace };
+    reduceServerState({ type: "trace.snapshot", traceId, trace: nextTrace });
   }
 
   function applyTraceHydrationResult(traceId: string, result: AgentChatResultResponse): void {
@@ -568,7 +614,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   function clearConversation(): void {
     messages.value = [];
     currentRequest.value = null;
-    const activeTraceId = activeTraceIdFromWorkspace(workspace.value);
+    const activeTraceId = activeTraceIdFromMessages(messages.value, turnStatusAuthority.value);
     if (activeTraceId) void clearActiveTrace(activeTraceId, "clear-conversation");
     restartRealtime("clear-conversation");
   }
@@ -625,7 +671,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   function realtimeTraceId(): string | null {
-    return firstNonEmptyString(currentRequest.value?.traceId, activeTraceIdFromMessages(messages.value, turnStatusAuthority.value), activeTraceIdFromWorkspace(workspace.value));
+    return firstNonEmptyString(currentRequest.value?.traceId, activeTraceIdFromMessages(messages.value, turnStatusAuthority.value));
   }
 
   function applyRealtimeEvent(event: WorkbenchRealtimeEvent, eventName: string): void {
@@ -656,6 +702,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     if (!shouldApplyWorkspaceSnapshot({ requestEpoch: workspaceSelectionEpoch.value, currentEpoch: workspaceSelectionEpoch.value, currentConversationId: activeConversationId.value, workspace: nextWorkspace })) return;
     const previousTraceId = realtimeTraceId();
     workspace.value = nextWorkspace;
+    rememberWorkspaceSnapshot(workspaceProjectId(nextWorkspace, activeProjectId.value), nextWorkspace);
     providerProfile.value = firstNonEmptyString(workspace.value?.providerProfile, workspace.value?.workspace?.providerProfile, providerProfile.value) ?? providerProfile.value;
     rememberWorkbenchProjectId(workspaceProjectId(workspace.value, activeProjectId.value));
     const nextTraceId = realtimeTraceId();
@@ -852,7 +899,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
       workspace: current.workspace,
       updatedByClient: "cloud-web-vue-active-trace-repair"
     });
-    if (response.ok && response.data?.workspace && shouldApplyWorkspaceSnapshot({ requestEpoch, currentEpoch: workspaceSelectionEpoch.value, currentConversationId: activeConversationId.value, workspace: response.data.workspace })) workspace.value = response.data.workspace;
+    if (response.ok && response.data?.workspace && shouldApplyWorkspaceSnapshot({ requestEpoch, currentEpoch: workspaceSelectionEpoch.value, currentConversationId: activeConversationId.value, workspace: response.data.workspace })) {
+      workspace.value = response.data.workspace;
+      rememberWorkspaceSnapshot(workspaceProjectId(workspace.value, activeProjectId.value), workspace.value);
+    }
   }
 
   function beginWorkspaceSelection(): number {
@@ -875,7 +925,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   function applySelectedConversationDetail(conversation: ConversationRecord, baseWorkspace: WorkspaceRecord | null, selectedProjectId: string, previousConversationId: string | null, previousMessages: ChatMessage[]): void {
+    setActiveConversationSelection(conversation.conversationId);
     workspace.value = workspaceWithSelectedConversation(baseWorkspace, conversation, selectedProjectId);
+    rememberWorkspaceSnapshot(selectedProjectId, workspace.value);
+    rememberConversationDetail(conversation);
     messages.value = restoreMessagesTraceAuthority(messagesFromSelectedConversation(conversation, conversation.conversationId, previousConversationId, previousMessages), previousMessages);
     conversations.value = mergeConversationIntoList(conversations.value, conversation);
     conversationsReady.value = true;
@@ -904,6 +957,8 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     }
     if (!response.ok || !response.data?.workspace || activeConversationId.value !== conversationId) return;
     workspace.value = workspaceWithSelectedConversation(response.data.workspace, conversation, selectedProjectId);
+    rememberWorkspaceSnapshot(selectedProjectId, workspace.value);
+    rememberConversationDetail(conversation);
   }
 
   async function retrySelectConversationWithFreshWorkspace(conversation: ConversationRecord, tabProjectId: string, requestEpoch: number): Promise<boolean> {
@@ -915,7 +970,10 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     }
     const freshWorkspace = fresh.data?.workspace;
     if (!fresh.ok || !freshWorkspace?.workspaceId) return false;
+    setActiveConversationSelection(conversation.conversationId);
     workspace.value = optimisticWorkspaceSelection(freshWorkspace, conversation, tabProjectId);
+    rememberWorkspaceSnapshot(tabProjectId, workspace.value);
+    rememberConversationDetail(conversation);
     const [retried, detailResponse] = await Promise.all([
       api.workbench.selectConversation(freshWorkspace.workspaceId, { projectId: tabProjectId, conversationId: conversation.conversationId, sessionId: conversation.sessionId, threadId: conversation.threadId, updatedByClient: "cloud-web-vue-retry" }),
       api.workbench.conversation(conversation.conversationId, { projectId: tabProjectId })
@@ -932,8 +990,13 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const selectedConversation = detailResponse.ok ? detailResponse.data?.conversation ?? null : null;
     if (!selectedConversation) error.value = detailResponse.error ?? "conversation unavailable";
     workspace.value = workspaceWithSelectedConversation(retried.data?.workspace ?? workspace.value, selectedConversation ?? conversation, conversationProjectId(selectedConversation ?? conversation, tabProjectId));
+    rememberWorkspaceSnapshot(tabProjectId, workspace.value);
+    rememberConversationDetail(selectedConversation ?? conversation);
     messages.value = messagesFromSelectedConversation(selectedConversation, conversation.conversationId, null, []);
-    if (selectedConversation) conversations.value = mergeConversationIntoList(conversations.value, selectedConversation);
+    if (selectedConversation) {
+      conversations.value = mergeConversationIntoList(conversations.value, selectedConversation);
+      rememberConversationDetail(selectedConversation);
+    }
     void hydrateTurnStatusAuthority(messages.value);
     void hydrateTerminalMessageDiagnostics();
     void hydrateTraceEvents(messages.value);
@@ -950,7 +1013,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
 
   function reattachRestoredActiveTrace(): void {
     void hydrateTraceEvents(messages.value);
-    const traceId = firstNonEmptyString(activeTraceIdFromMessages(messages.value, turnStatusAuthority.value), activeTraceIdFromWorkspace(workspace.value));
+    const traceId = activeTraceIdFromMessages(messages.value, turnStatusAuthority.value);
     if (traceId) void validateAndReattachTrace(traceId);
   }