fix: event-loop freezes, plugin-install boot crash, tmux attach/scrollbar, Codex transcripts

- GET /api/workflows: one LEAD() window pass in a read worker (read-pool.js,
  workflow-stats.js); idx_events_session restored, idx_events_tool added
- compat-sqlite gains function/pluck/readonly so a plugin install without a
  better-sqlite3 build boots again; antigravity-usage uses db.js's Database
- install-hooks adds no checkout hooks while the agenthub plugin is enabled
  (events were doubled)
- terminal attach runs the live tmux server's own binary; the pane scrollbar
  gets a visible 2-column style, and claude panes start with
  CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1 so tmux keeps history to scroll
- Codex sessions' conversation in GET /api/sessions/:id/transcript
- Codex/Antigravity sessions claimed by their workspace without hooks
- UI-audit follow-ups, docs and OpenAPI

client/src/App.tsx

@@ -54,7 +54,7 @@
  * - `skills/file-headers/` — mandatory `@author` header policy.
  * ============================================================================= */
 
-import { BrowserRouter, Routes, Route, Navigate, useParams } from "react-router-dom";
+import { BrowserRouter, Routes, Route, Navigate, useParams, useLocation } from "react-router-dom";
 import { lazy, Suspense, useCallback, useEffect, type ReactNode } from "react";
 import { useTranslation } from "react-i18next";
 import { Layout } from "./components/Layout";
@@ -92,8 +92,9 @@ function PageFallback() {
 }
 
 function Page({ children }: { children: ReactNode }) {
+  const { pathname } = useLocation();
   return (
-    <RouteErrorBoundary>
+    <RouteErrorBoundary resetKey={pathname}>
       <Suspense fallback={<PageFallback />}>{children}</Suspense>
     </RouteErrorBoundary>
   );

client/src/components/RouteErrorBoundary.tsx

@@ -5,7 +5,9 @@
  * which the SPA fallback answers with index.html, so the dynamic import
  * rejects: that case reloads the page once (a sessionStorage guard stops a
  * reload loop). Any other render error — or a second chunk failure — shows a
- * themed "Something went wrong — Reload" panel instead of a blank app.
+ * themed "Something went wrong — Reload" panel instead of a blank app, until the
+ * route changes (`resetKey`): the lazy routes share one boundary instance, so
+ * an error on one page would otherwise stay on every other.
  * `reloadOnce` is also used by App's `vite:preloadError` listener.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
@@ -45,6 +47,8 @@ interface Props {
   children: ReactNode;
   /** Injected in tests; defaults to `window.location.reload`. */
   reload?: () => void;
+  /** A change (the route's path) clears a caught error. */
+  resetKey?: string;
 }
 
 export class RouteErrorBoundary extends Component<Props, { error: Error | null }> {
@@ -58,6 +62,10 @@ export class RouteErrorBoundary extends Component<Props, { error: Error | null }
     if (isChunkLoadError(error)) reloadOnce(this.props.reload);
   }
 
+  componentDidUpdate(prev: Props) {
+    if (this.state.error && prev.resetKey !== this.props.resetKey) this.setState({ error: null });
+  }
+
   render() {
     if (!this.state.error) return this.props.children;
     const reload = this.props.reload ?? (() => window.location.reload());

client/src/components/__tests__/RouteErrorBoundary.test.tsx

@@ -49,6 +49,28 @@ describe("RouteErrorBoundary", () => {
     expect(reload).not.toHaveBeenCalled();
   });
 
+  it("clears the error when the route changes, so the next page renders", () => {
+    const { rerender } = render(
+      <RouteErrorBoundary reload={reload} resetKey="/workspace">
+        <Boom error={new Error("boom")} />
+      </RouteErrorBoundary>
+    );
+    expect(screen.getByRole("alert")).toBeInTheDocument();
+    rerender(
+      <RouteErrorBoundary reload={reload} resetKey="/workspace">
+        <p>settings page</p>
+      </RouteErrorBoundary>
+    );
+    expect(screen.getByRole("alert")).toBeInTheDocument();
+    rerender(
+      <RouteErrorBoundary reload={reload} resetKey="/settings/general">
+        <p>settings page</p>
+      </RouteErrorBoundary>
+    );
+    expect(screen.queryByRole("alert")).not.toBeInTheDocument();
+    expect(screen.getByText("settings page")).toBeInTheDocument();
+  });
+
   it("reloads on a chunk error the first time", () => {
     render(
       <RouteErrorBoundary reload={reload}>

client/src/components/__tests__/WorkspaceTree.test.tsx

@@ -154,12 +154,32 @@ describe("WorkspaceTree", () => {
     expect(within(list).getByText("Live one")).toBeInTheDocument();
     // Its OWN sessions only — never the rest of its folder.
     expect(api.sessions.list).toHaveBeenCalledTimes(1);
-    expect(api.sessions.list).toHaveBeenCalledWith({ lane: 1, archived: false, limit: 20 });
+    expect(api.sessions.list).toHaveBeenCalledWith({ lane: 1, archived: false, limit: 6 });
     expect(JSON.parse(localStorage.getItem("agenthub.sidebar.projects")!).expanded).toEqual({
       "1": true,
     });
   });
 
+  it("shows six sessions and loads the rest on See all", async () => {
+    const all = Array.from({ length: 9 }, (_, i) => session(`s-${i}`, `Session ${i}`));
+    vi.mocked(api.sessions.list).mockImplementation(async (p) => ({
+      sessions: all.slice(0, p?.limit),
+      total: all.length,
+      limit: p?.limit ?? 50,
+      offset: 0,
+    }));
+    const user = userEvent.setup();
+    renderTree();
+    await user.click(await screen.findByTestId("workspace-toggle-1"));
+    const list = await screen.findByTestId("workspace-sessions-1");
+    expect(within(list).getAllByTestId(/^workspace-session-s-\d+$/)).toHaveLength(6);
+    expect(screen.getByTestId("workspace-sessions-more-1")).toHaveTextContent("See all (3 more)");
+    await user.click(screen.getByTestId("workspace-sessions-more-1"));
+    expect(api.sessions.list).toHaveBeenLastCalledWith({ lane: 1, archived: false, limit: 9 });
+    await screen.findByText("Session 8");
+    expect(screen.queryByTestId("workspace-sessions-more-1")).toBeNull();
+  });
+
   it("renames a session on double-click + Enter, and archives one from its row", async () => {
     const user = userEvent.setup();
     renderTree();

client/src/components/lanes/LaneDiffView.tsx

@@ -751,7 +751,9 @@ export function LaneDiffView({
   const [anchor, setAnchor] = useState<{ top: number; left: number } | null>(null);
   const place = useCallback(() => {
     const r = anchorEl.current?.isConnected ? anchorEl.current.getBoundingClientRect() : null;
-    if (r) setAnchor({ top: r.bottom + 2, left: r.left });
+    // A long diff unmounts rows scrolled out of its window, the clicked number
+    // with them: the box docks under the diff rather than float over other lines.
+    setAnchor(r ? { top: r.bottom + 2, left: r.left } : null);
   }, []);
   useEffect(() => {
     if (commentAt == null) return;
@@ -764,7 +766,6 @@ export function LaneDiffView({
         ? {
             open: (line: number, el?: HTMLElement) => {
               anchorEl.current = el ?? null;
-              setAnchor(null);
               place();
               setCommentAt(line);
               setUndelivered(false);

client/src/components/lanes/WorkspaceSessionList.tsx

@@ -17,7 +17,8 @@
  * any other session opens in its workspace too (`?lane=<id>&session=<id>`,
  * `SessionReplay`): its conversation with a prompt box, resumed only when a
  * message is SENT, because a resume re-reads the whole transcript into context.
- * The list shows `SESSION_LIMIT` rows and a **Show N more** under them. A
+ * The list shows `SESSION_LIMIT` rows and a **See all (N more)** under them that
+ * loads every one. A
  * live tab whose session was archived is not brought back as a New session,
  * and archiving a live one asks first. F2 renames the focused row too; each
  * dot carries its meaning as screen-reader text.
@@ -39,7 +40,7 @@ import { useAiTools } from "../../hooks/useAiTools";
 import { useContextMenu } from "../ContextMenu";
 import { SessionMenu } from "./SessionMenu";
 
-export const SESSION_LIMIT = 20;
+export const SESSION_LIMIT = 6;
 
 /**
  * The live pane holding a session: the run the hooks bound it to
@@ -244,7 +245,7 @@ export function WorkspaceSessionList({
   const [busy, setBusy] = useState(false);
   const ctx = useContextMenu<RunHandle>();
   const sessionCtx = useContextMenu<Session>();
-  // Rows shown; Show more adds a page.
+  // Rows shown; See all raises it to the whole list.
   const [limit, setLimit] = useState(SESSION_LIMIT);
 
   // This workspace's live AI tabs. A tab started bare (no prompt) has its
@@ -525,10 +526,10 @@ export function WorkspaceSessionList({
         <button
           type="button"
           data-testid={`workspace-sessions-more-${lane.id}`}
-          onClick={() => setLimit((n) => n + SESSION_LIMIT)}
+          onClick={() => own && setLimit(own.total)}
           className="w-full py-1 pl-8 pr-2 text-left text-[11px] text-fg-muted hover:text-fg-primary"
         >
-          {t("tree.showMore", { count: Math.min(more, SESSION_LIMIT) })}
+          {t("tree.seeAll", { count: more })}
         </button>
       )}
       {failure}

client/src/components/lanes/__tests__/LaneDiffView.test.tsx

@@ -528,6 +528,17 @@ describe("LaneDiffView — line comments", () => {
     expect(screen.queryByTestId("diff-comment-box")).toBeNull();
   });
 
+  it("docks the box under the diff once its line scrolls out of a windowed diff", () => {
+    render(<LaneDiffView file={FILE} layout="unified" onComment={() => true} />);
+    const btn = screen.getByTestId("diff-comment-line-1");
+    fireEvent.click(btn);
+    expect(screen.getByTestId("diff-comment-box").style.position).toBe("fixed");
+    // What windowing does to a row scrolled out of range.
+    btn.remove();
+    fireEvent.scroll(screen.getByTestId("lane-diff-view"));
+    expect(screen.getByTestId("diff-comment-box").style.position).toBe("");
+  });
+
   it("offers no comment button without onComment", () => {
     render(<LaneDiffView file={FILE} layout="unified" />);
     expect(screen.queryByTestId("diff-comment-line-1")).toBeNull();

client/src/components/run/TerminalView.tsx

@@ -108,6 +108,8 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
   const paletteRef = useRef(palette);
   paletteRef.current = palette;
   const termRef = useRef<Terminal | null>(null);
+  // The current attach: a paste into a socket that is not open would be dropped.
+  const wsRef = useRef<WebSocket | null>(null);
   const { t } = useTranslation("run");
   const tRef = useRef(t);
   tRef.current = t;
@@ -319,6 +321,7 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
       const size = term.cols > 1 && term.rows > 1 ? `?cols=${term.cols}&rows=${term.rows}` : "";
       const sock = new WebSocket(`${wsBaseUrl}/ws-pty/${encodeURIComponent(runId)}${size}`);
       ws = sock;
+      wsRef.current = sock;
       // Server sends PTY bytes as binary frames — default binaryType ("blob")
       // would hand onmessage a Blob that the string checks below never match,
       // silently dropping all terminal output. "arraybuffer" keeps it sync.
@@ -432,8 +435,10 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
           termRef.current?.paste(text);
           termRef.current?.focus();
         },
-        // On screen: a console hidden with CSS measures 0×0.
-        () => !!containerRef.current?.offsetWidth
+        // On screen (a console hidden with CSS measures 0×0) AND attached:
+        // `onData` drops input while the socket is connecting or reconnecting,
+        // so a caller waits or says the paste failed instead.
+        () => !!containerRef.current?.offsetWidth && wsRef.current?.readyState === WebSocket.OPEN
       ),
     [runId]
   );

client/src/components/run/__tests__/TerminalView.test.tsx

@@ -10,6 +10,7 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { render, cleanup, act, fireEvent, screen, waitFor } from "@testing-library/react";
 import { TerminalView } from "../TerminalView";
+import { pasteToRun } from "../../../lib/panePaste";
 
 const writeMock = vi.fn();
 const onDataHandlers: Array<(d: string) => void> = [];
@@ -288,6 +289,24 @@ describe("TerminalView", () => {
     expect(screen.getByTestId("terminal-reconnecting")).toHaveTextContent("Reconnecting");
   });
 
+  it("takes no paste while its socket is not open, so the text is not dropped unseen", () => {
+    const width = vi.spyOn(HTMLElement.prototype, "offsetWidth", "get").mockReturnValue(800);
+    try {
+      render(<TerminalView runId="agenthub-lane-7" wsBaseUrl="ws://localhost:4820" />);
+      const ws = MockWebSocket.instances[0]!;
+      ws.readyState = 0; // CONNECTING
+      expect(pasteToRun("agenthub-lane-7", "hello")).toBe(false);
+      ws.readyState = 1;
+      act(() => ws.onopen?.());
+      expect(pasteToRun("agenthub-lane-7", "hello")).toBe(true);
+      ws.readyState = 3; // CLOSED: Reconnecting…
+      act(() => ws.onclose?.());
+      expect(pasteToRun("agenthub-lane-7", "hello")).toBe(false);
+    } finally {
+      width.mockRestore();
+    }
+  });
+
   it("takes the keyboard as soon as it mounts", () => {
     // The terminal IS the page here — without this the first thing typed after
     // opening a lane went nowhere until the user clicked the pane.

client/src/i18n/locales/en/lanes.json

@@ -427,6 +427,7 @@
   "tree.state.idle": "ended",
   "tree.showMore_one": "Show {{count}} more",
   "tree.showMore_other": "Show {{count}} more",
+  "tree.seeAll": "See all ({{count}} more)",
   "home.contextPanel": "Workspace context",
   "row.state.needsYou": "needs you",
   "row.state.error": "error",

client/src/i18n/locales/en/sessions.json

@@ -56,6 +56,7 @@
   },
   "exportCsv": "CSV",
   "exportJson": "JSON",
+  "exportCapped": "The file holds {{shown}} of {{total}} sessions (the export limit) — narrow the filters to export the rest.",
   "filterDirectory": "Filter by directory",
   "allDirectories": "All directories",
   "sortLabel": "Sort sessions",

client/src/i18n/locales/vi/lanes.json

@@ -427,6 +427,7 @@
   "tree.state.idle": "đã kết thúc",
   "tree.showMore_one": "Hiện thêm {{count}}",
   "tree.showMore_other": "Hiện thêm {{count}}",
+  "tree.seeAll": "Xem tất cả (thêm {{count}})",
   "home.contextPanel": "Ngữ cảnh workspace",
   "row.state.needsYou": "cần bạn",
   "row.state.error": "lỗi",

client/src/i18n/locales/vi/sessions.json

@@ -55,6 +55,7 @@
   },
   "exportCsv": "CSV",
   "exportJson": "JSON",
+  "exportCapped": "Tệp chỉ gồm {{shown}} trên {{total}} phiên (giới hạn xuất) — hãy thu hẹp bộ lọc để xuất phần còn lại.",
   "filterDirectory": "Lọc theo thư mục",
   "allDirectories": "Tất cả thư mục",
   "sortLabel": "Sắp xếp phiên",

client/src/lib/__tests__/runWorktree.test.ts

@@ -0,0 +1,29 @@
+/**
+ * @file runWorktree.test.ts
+ * @description The Changes panel's worktree session for a `?run=` pane survives
+ * a poll that misses the run, and follows every real answer.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect } from "vitest";
+import { runWorktreeSession } from "../runWorktree";
+
+const wt = { worktree: true, sessionId: "s1" };
+
+describe("runWorktreeSession", () => {
+  it("follows the listed run's worktree session", () => {
+    expect(runWorktreeSession(null, "r1", wt)).toEqual({ run: "r1", session: "s1" });
+    expect(runWorktreeSession(null, "r1", { worktree: false, sessionId: "s1" })).toBeNull();
+  });
+
+  it("keeps the last answer through a poll that misses the run", () => {
+    const prev = runWorktreeSession(null, "r1", wt);
+    expect(runWorktreeSession(prev, "r1", undefined)).toEqual({ run: "r1", session: "s1" });
+  });
+
+  it("drops it for another run or no run", () => {
+    const prev = runWorktreeSession(null, "r1", wt);
+    expect(runWorktreeSession(prev, "r2", undefined)).toBeNull();
+    expect(runWorktreeSession(prev, null, undefined)).toBeNull();
+  });
+});

client/src/lib/__tests__/toast.test.ts

@@ -0,0 +1,35 @@
+/**
+ * @file toast.test.ts
+ * @description The toast queue: at most four on screen, and an error — which
+ * stays until dismissed — is never the one pushed out by newer toasts.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect, afterEach } from "vitest";
+import { toast, subscribeToasts, dismissToast, type ToastItem } from "../toast";
+
+let current: ToastItem[] = [];
+const unsubscribe = subscribeToasts((items) => (current = items));
+
+afterEach(() => {
+  for (const t of current) dismissToast(t.id);
+});
+
+describe("toast queue", () => {
+  it("keeps an unread error when newer toasts overflow the queue", () => {
+    toast.error("save failed");
+    for (let i = 0; i < 5; i++) toast.success(`copied ${i}`);
+    expect(current).toHaveLength(4);
+    expect(current.map((t) => t.message)).toContain("save failed");
+    expect(current[current.length - 1]?.message).toBe("copied 4");
+  });
+
+  it("still shows the newest toast when only errors are queued", () => {
+    for (let i = 0; i < 4; i++) toast.error(`error ${i}`);
+    toast.info("hello");
+    expect(current).toHaveLength(4);
+    expect(current[current.length - 1]?.message).toBe("hello");
+  });
+});
+
+void unsubscribe;

client/src/lib/api.ts

@@ -1255,10 +1255,21 @@ export const api = {
      * "all" (which means "no filter"), keeping the default URL param-free.
      *
      * @param status Optional lifecycle filter; "all" (or omitted) means no filter.
-     * @returns {@link WorkflowData} — the aggregated workflow-intelligence panel.
+     * @param sections Optional subset of the bundle to compute (`?sections=`);
+     *   the server skips the rest, so a page reading a few cards asks for those.
+     * @returns {@link WorkflowData} — the aggregated workflow-intelligence panel,
+     *   or just the named sections of it.
      */
-    get: (status?: string) =>
-      request<WorkflowData>(`/workflows${status && status !== "all" ? `?status=${status}` : ""}`),
+    get: <K extends keyof WorkflowData = keyof WorkflowData>(
+      status?: string,
+      sections?: readonly K[]
+    ) => {
+      const qs = new URLSearchParams();
+      if (status && status !== "all") qs.set("status", status);
+      if (sections?.length) qs.set("sections", sections.join(","));
+      const q = qs.toString();
+      return request<Pick<WorkflowData, K>>(`/workflows${q ? `?${q}` : ""}`);
+    },
     /**
      * GET /api/workflows/session/:id - single-session drill-in (agent tree,
      * tool timeline, swim lanes).

client/src/lib/runWorktree.ts

@@ -0,0 +1,29 @@
+/**
+ * @file runWorktree.ts
+ * @description Which `claude --worktree` session the Workspace's Changes panel
+ * follows for the URL's `?run=` pane. A poll that misses the run (one bad read
+ * lists no runs) keeps the last answer instead of moving the panel to the main
+ * folder — which, while it holds an unsaved edit, asked to discard it out of
+ * nowhere.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+export interface RunWorktree {
+  run: string;
+  session: string;
+}
+
+/**
+ * @param prev The previous answer.
+ * @param runParam The URL's `?run=`.
+ * @param opened That run in the latest list, if the list had it.
+ */
+export function runWorktreeSession(
+  prev: RunWorktree | null,
+  runParam: string | null,
+  opened: { worktree?: boolean; sessionId: string | null } | undefined
+): RunWorktree | null {
+  if (!runParam) return null;
+  if (!opened) return prev?.run === runParam ? prev : null;
+  return opened.worktree && opened.sessionId ? { run: runParam, session: opened.sessionId } : null;
+}

client/src/lib/toast.ts

@@ -16,6 +16,7 @@ export interface ToastItem {
 }
 
 const SUCCESS_MS = 4000;
+const MAX_TOASTS = 4;
 let items: ToastItem[] = [];
 let nextId = 1;
 const listeners = new Set<(items: ToastItem[]) => void>();
@@ -33,7 +34,14 @@ export function dismissToast(id: number): void {
 function push(kind: ToastKind, message: string): number {
   const id = nextId++;
   // Same text twice in a row (a double click, a retry) shows once.
-  items = [...items.filter((t) => t.message !== message), { id, kind, message }].slice(-4);
+  const next = [...items.filter((t) => t.message !== message), { id, kind, message }];
+  // Over four: the oldest non-error goes first, so an unread error is not pushed
+  // out by a few copies or saves; the newest toast always stays.
+  while (next.length > MAX_TOASTS) {
+    const older = next.slice(0, -1).findIndex((t) => t.kind !== "error");
+    next.splice(older === -1 ? 0 : older, 1);
+  }
+  items = next;
   emit();
   if (kind !== "error") window.setTimeout(() => dismissToast(id), SUCCESS_MS);
   return id;

client/src/pages/ActivityFeed.tsx

@@ -113,6 +113,18 @@ const PAGE_SIZE = 50;
 // stream still refreshes, which a trailing debounce never did.
 const REFRESH_THROTTLE_MS = 1000;
 
+/** The agents on screen not asked about yet, and the sessions to ask for them. */
+export function agentsToFetch(
+  events: { session_id: string; agent_id?: string | null }[],
+  asked: ReadonlySet<string>
+): { agentIds: string[]; sessionIds: string[] } {
+  const fresh = events.filter((e) => e.agent_id && !asked.has(e.agent_id));
+  return {
+    agentIds: [...new Set(fresh.map((e) => e.agent_id as string))],
+    sessionIds: [...new Set(fresh.map((e) => e.session_id))],
+  };
+}
+
 export function ActivityFeed({ embedded = false }: { embedded?: boolean } = {}) {
   const eventCtx = useContextMenu<DashboardEvent>();
   const { t } = useTranslation("activity");
@@ -158,7 +170,7 @@ export function ActivityFeed({ embedded = false }: { embedded?: boolean } = {})
   // agent_id → subagent-facing info for the agents of the sessions on screen,
   // fetched in one call per new set of sessions (never every agent).
   const [agentInfoById, setAgentInfoById] = useState<Map<string, AgentInfo>>(() => new Map());
-  const knownAgentSessions = useRef(new Set<string>());
+  const askedAgents = useRef(new Set<string>());
 
   const pausedRef = useRef(paused);
   pausedRef.current = paused;
@@ -223,13 +235,12 @@ export function ActivityFeed({ embedded = false }: { embedded?: boolean } = {})
     load();
   }, [load]);
 
-  // Agent labels for the sessions on screen that we have not seen yet.
+  // Agent labels for agents on screen not asked about yet — keyed by agent, so
+  // a subagent spawned later in a live session gets its label too.
   useEffect(() => {
-    const missing = [...new Set(events.map((e) => e.session_id))].filter(
-      (sid) => !knownAgentSessions.current.has(sid)
-    );
+    const { agentIds, sessionIds: missing } = agentsToFetch(events, askedAgents.current);
     if (missing.length === 0) return;
-    for (const sid of missing) knownAgentSessions.current.add(sid);
+    for (const id of agentIds) askedAgents.current.add(id);
     api.agents
       .list({ session_ids: missing, limit: 5000 })
       .then(({ agents }) =>
@@ -247,7 +258,7 @@ export function ActivityFeed({ embedded = false }: { embedded?: boolean } = {})
       )
       .catch(() => {
         // Non-fatal: subagent pills fall back to the short-id label.
-        for (const sid of missing) knownAgentSessions.current.delete(sid);
+        for (const id of agentIds) askedAgents.current.delete(id);
       });
   }, [events]);
 

client/src/pages/CcConfig.tsx

@@ -388,7 +388,7 @@ export function CcConfig() {
   // and Back land on it.
   const [params, setParams] = useSearchParams();
   const rawTab = params.get("tab");
-  const tab: TabKey = TABS.some((d) => d.key === rawTab) ? (rawTab as TabKey) : "overview";
+  const urlTab: TabKey = TABS.some((d) => d.key === rawTab) ? (rawTab as TabKey) : "overview";
   // Editors inside a tab report unsaved edits here (by id), so leaving the tab
   // asks first instead of silently dropping the draft.
   const dirtyIds = useRef(new Set<string>());
@@ -396,11 +396,8 @@ export function CcConfig() {
     if (d) dirtyIds.current.add(id);
     else dirtyIds.current.delete(id);
   }, []);
-  const setTab = useCallback(
-    async (k: TabKey) => {
-      if (k === tab) return;
-      if (dirtyIds.current.size > 0 && !(await confirmDiscard())) return;
-      dirtyIds.current.clear();
+  const writeTab = useCallback(
+    (k: TabKey) =>
       setParams(
         (prev) => {
           const next = new URLSearchParams(prev);
@@ -409,10 +406,30 @@ export function CcConfig() {
           return next;
         },
         { replace: true }
-      );
-    },
-    [tab, setParams]
+      ),
+    [setParams]
   );
+  // The tab shown follows the URL, but only once an unsaved edit is let go:
+  // the URL also changes from outside the tab bar (a settings search result,
+  // Back), and those must ask too. Kept, the URL goes back to the shown tab.
+  const [tab, setShownTab] = useState<TabKey>(urlTab);
+  useEffect(() => {
+    if (urlTab === tab) return;
+    let live = true;
+    void (async () => {
+      if (dirtyIds.current.size > 0 && !(await confirmDiscard())) {
+        if (live) writeTab(tab);
+        return;
+      }
+      if (!live) return;
+      dirtyIds.current.clear();
+      setShownTab(urlTab);
+    })();
+    return () => {
+      live = false;
+    };
+  }, [urlTab, tab, writeTab]);
+  const setTab = useCallback((k: TabKey) => writeTab(k), [writeTab]);
   // Bumped by Refresh: the AgentHub cards load on mount, so a new key reloads them.
   const [agenthubKey, setAgenthubKey] = useState(0);
   const [scope, setScope] = useState<CcScope>("all");

client/src/pages/Dashboard.tsx

@@ -1583,15 +1583,30 @@ function AnalyticsTab() {
   );
 }
 
+// The workflow sections the health cards read; the server computes only these.
+const HEALTH_SECTIONS = [
+  "stats",
+  "toolFlow",
+  "effectiveness",
+  "modelDelegation",
+  "errorPropagation",
+  "concurrency",
+  "compaction",
+] as const satisfies readonly (keyof WorkflowData)[];
+type HealthWorkflow = Pick<WorkflowData, (typeof HEALTH_SECTIONS)[number]>;
+
 function SystemHealthTab() {
   const { t } = useTranslation("dashboard");
   const [info, setInfo] = useState<SystemInfo | null>(null);
-  const [workflow, setWorkflow] = useState<WorkflowData | null>(null);
+  const [workflow, setWorkflow] = useState<HealthWorkflow | null>(null);
 
   const [loadError, setLoadError] = useState<string | null>(null);
   const loadData = useCallback(async () => {
     try {
-      const [infoRes, workflowRes] = await Promise.all([api.settings.info(), api.workflows.get()]);
+      const [infoRes, workflowRes] = await Promise.all([
+        api.settings.info(),
+        api.workflows.get(undefined, HEALTH_SECTIONS),
+      ]);
       setInfo(infoRes as any);
       setWorkflow(workflowRes);
       setLoadError(null);

client/src/pages/Sessions.tsx

@@ -304,6 +304,9 @@ export function Sessions({ embedded = false }: { embedded?: boolean } = {}) {
           ]),
           "text/csv"
         );
+      // The server answers at most 10 000 rows: say the file is not all of them.
+      if (res.total > res.sessions.length)
+        toast.info(t("exportCapped", { shown: res.sessions.length, total: res.total }));
     } catch (err) {
       toast.error(err);
     } finally {

client/src/pages/SettingsHub.tsx

@@ -96,6 +96,14 @@ const historyIdx = (): number => {
   return typeof idx === "number" ? idx : 0;
 };
 
+/**
+ * How far Back moves: to the entry before the one Settings was entered at, and
+ * always at least one step — after a browser Back below that entry, the plain
+ * difference would be 0 (`history.go(0)`, a reload) or a step forward.
+ */
+export const backDelta = (current: number, entry: number): number =>
+  -Math.max(1, current - entry + 1);
+
 /** An unknown section: say so, then show General. */
 function UnknownSection({ name }: { name: string }) {
   const { t } = useTranslation("settings");
@@ -142,7 +150,12 @@ export function SettingsHub() {
   // Deep link to a row: scroll to the anchor once the page has rendered it
   // (content loads async, so poll briefly) and highlight it for a moment.
   useEffect(() => {
-    const id = decodeURIComponent(location.hash.slice(1));
+    let id = location.hash.slice(1);
+    try {
+      id = decodeURIComponent(id);
+    } catch {
+      // A malformed escape (`#%`): look the raw text up instead of crashing.
+    }
     if (!id) return;
     let timer: number | undefined;
     let lit: Element | null = null;
@@ -363,7 +376,7 @@ export function SettingsHub() {
   const back = (e: MouseEvent) => {
     if (!canGoBack) return;
     e.preventDefault();
-    navigate(-(historyIdx() - (entryIdx.current ?? 0) + 1));
+    navigate(backDelta(historyIdx(), entryIdx.current ?? 0));
   };
 
   return (

client/src/pages/Workspace.tsx

@@ -49,6 +49,7 @@
  *
  * ----------------------------------------------------------------------------- */
 
+import { runWorktreeSession, type RunWorktree } from "../lib/runWorktree";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useLocation, useNavigate, useSearchParams } from "react-router-dom";
 import { useTranslation } from "react-i18next";
@@ -687,12 +688,13 @@ export function Workspace() {
     };
     // eslint-disable-next-line react-hooks/exhaustive-deps -- the lane by id
   }, [sessionParam, replayLane?.id]);
-  const gitSession =
-    openedRun?.worktree && openedRun.sessionId
-      ? openedRun.sessionId
-      : sessionParam && replayed?.id === sessionParam && replayed.worktree
-        ? sessionParam
-        : undefined;
+  const runWorktree = useRef<RunWorktree | null>(null);
+  runWorktree.current = runWorktreeSession(runWorktree.current, runParam, openedRun);
+  const gitSession = runWorktree.current
+    ? runWorktree.current.session
+    : sessionParam && replayed?.id === sessionParam && replayed.worktree
+      ? sessionParam
+      : undefined;
 
   // An unsaved whole-file edit in the Changes panel. While it is open the
   // panel stays on the tree it was opened in — moving it (another workspace,

client/src/pages/__tests__/ActivityFeed.agents.test.ts

@@ -0,0 +1,32 @@
+/**
+ * @file ActivityFeed.agents.test.ts
+ * @description The Activity feed asks for agent labels by agent, not by
+ * session: a subagent spawned later in a session already on screen is fetched
+ * too, and an agent already asked about is not asked for again.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect } from "vitest";
+import { agentsToFetch } from "../ActivityFeed";
+
+describe("agentsToFetch", () => {
+  it("asks again for a session once a new agent of it appears", () => {
+    const asked = new Set(["s1-main"]);
+    const events = [
+      { session_id: "s1", agent_id: "s1-main" },
+      { session_id: "s1", agent_id: "s1-sub-late" },
+      { session_id: "s2", agent_id: null },
+    ];
+    expect(agentsToFetch(events, asked)).toEqual({
+      agentIds: ["s1-sub-late"],
+      sessionIds: ["s1"],
+    });
+  });
+
+  it("asks nothing when every agent on screen is known", () => {
+    expect(agentsToFetch([{ session_id: "s1", agent_id: "a" }], new Set(["a"]))).toEqual({
+      agentIds: [],
+      sessionIds: [],
+    });
+  });
+});

client/src/pages/__tests__/CcConfig.dataSafety.test.tsx

@@ -10,7 +10,7 @@
 import { describe, it, expect, vi, afterEach } from "vitest";
 import { render, screen, act, within } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
-import { MemoryRouter } from "react-router-dom";
+import { MemoryRouter, useLocation, useNavigate } from "react-router-dom";
 import { settleConfirm, subscribeConfirm, type PendingConfirm } from "../../lib/confirm";
 import { eventBus } from "../../lib/eventBus";
 
@@ -119,6 +119,40 @@ describe("CcConfig — settings editor", () => {
     expect(ccConfigMock.patchSettings).toHaveBeenCalledWith({ scope: "user", unset: ["a"] });
   });
 
+  it("a tab change from the URL (a search result) asks before dropping an unsaved edit", async () => {
+    const user = userEvent.setup();
+    function Jump() {
+      const navigate = useNavigate();
+      const loc = useLocation();
+      return (
+        <>
+          <button onClick={() => navigate("/settings/claude?tab=skills")}>jump</button>
+          <span data-testid="url">{loc.search}</span>
+        </>
+      );
+    }
+    render(
+      <MemoryRouter initialEntries={["/settings/claude?tab=settings"]}>
+        <CcConfig />
+        <Jump />
+      </MemoryRouter>
+    );
+    await settle();
+    await user.click(screen.getByRole("button", { name: /^edit$/i }));
+    await user.click(screen.getAllByRole("button", { name: /remove key/i })[0]!);
+    let pending: PendingConfirm | null = null;
+    const off = subscribeConfirm((p) => (pending = p));
+    await user.click(screen.getByRole("button", { name: "jump" }));
+    await settle();
+    expect(pending).not.toBeNull();
+    // Keep editing: the draft stays and the URL goes back to its tab.
+    await act(async () => settleConfirm(false));
+    await settle();
+    off();
+    expect(screen.getByRole("button", { name: /^save$/i })).toBeInTheDocument();
+    expect(screen.getByTestId("url")).toHaveTextContent("?tab=settings");
+  });
+
   it("a renamed key is sent under its new name, not dropped", async () => {
     const user = userEvent.setup();
     render(

client/src/pages/__tests__/SettingsHub.test.tsx

@@ -58,7 +58,7 @@ vi.mock("../../lib/api", async (importOriginal) => {
   };
 });
 
-import { SettingsHub } from "../SettingsHub";
+import { SettingsHub, backDelta } from "../SettingsHub";
 import { __resetAiTools } from "../../hooks/useAiTools";
 import { subscribeToasts, type ToastItem } from "../../lib/toast";
 
@@ -243,6 +243,21 @@ describe("SettingsHub", () => {
     await vi.waitFor(() => expect(row.className).toContain("ring-2"));
   });
 
+  it("a malformed #anchor is ignored instead of crashing the page", async () => {
+    renderAt("/settings/data#%E0%A4");
+    expect(await screen.findByTestId("settings-data")).toBeInTheDocument();
+  });
+
+  it("Back always goes back: one step past the entry, at least one step", () => {
+    // Entered at index 2, now two pages further on: back to index 1.
+    expect(backDelta(4, 2)).toBe(-3);
+    expect(backDelta(2, 2)).toBe(-1);
+    // Browser Back moved below the entry with the hub still mounted: one step,
+    // never history.go(0) (a reload) or a step forward.
+    expect(backDelta(1, 2)).toBe(-1);
+    expect(backDelta(0, 2)).toBe(-1);
+  });
+
   it("toasts when an unknown section falls back to General", async () => {
     let seen: ToastItem[] = [];
     const off = subscribeToasts((i) => (seen = i));