feat: synchronize presenter controls

web/apps/console/src/presentation/presenter/PresenterNavigationBar.tsx

@@ -1,11 +1,14 @@
 import type { PresenterBeatNote } from "./presenter-notes.js";
 import { presenterHashForNote } from "./presenter-navigation.js";
+import { PresentationPairingPanel } from "../sync/PresentationPairingPanel.js";
+import type { PresentationSyncController } from "../sync/presentation-sync-state.js";
 
 type PresenterNavigationBarProps = {
   readonly currentIndex: number;
   readonly total: number;
   readonly previous: PresenterBeatNote | null;
   readonly next: PresenterBeatNote | null;
+  readonly syncController: PresentationSyncController;
 };
 
 const DirectionLink = ({ note, children }: { readonly note: PresenterBeatNote | null; readonly children: string }) =>
@@ -13,10 +16,11 @@ const DirectionLink = ({ note, children }: { readonly note: PresenterBeatNote |
     ? <a href={presenterHashForNote(note)}>{children}</a>
     : <span aria-disabled="true">{children}</span>;
 
-export const PresenterNavigationBar = ({ currentIndex, total, previous, next }: PresenterNavigationBarProps) => (
+export const PresenterNavigationBar = ({ currentIndex, total, previous, next, syncController }: PresenterNavigationBarProps) => (
   <nav className="presenter-navigation" aria-label="Presenter note navigation">
     <DirectionLink note={previous}>← Previous</DirectionLink>
     <span>{currentIndex + 1} / {total}</span>
     <DirectionLink note={next}>Next →</DirectionLink>
+    <PresentationPairingPanel role="presenter" controller={syncController} />
   </nav>
 );

web/apps/console/src/presentation/presenter/PresenterRoute.test.tsx

@@ -1,8 +1,28 @@
-import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { act, cleanup, fireEvent, render, screen } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
-import { afterEach, describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import type { PresentationSyncController } from "../sync/presentation-sync-state.js";
+import { usePresentationSync } from "../sync/usePresentationSync.js";
 import { PresenterRoute } from "./PresenterRoute.js";
 
+vi.mock("../sync/usePresentationSync.js", () => ({
+  usePresentationSync: vi.fn(),
+}));
+
+const mockedUsePresentationSync = vi.mocked(usePresentationSync);
+const idleController = (): PresentationSyncController => ({
+  state: { kind: "standalone" },
+  startSession: vi.fn(async () => undefined),
+  joinSession: vi.fn(async () => undefined),
+  retry: vi.fn(),
+  leaveSession: vi.fn(),
+  endSession: vi.fn(),
+});
+
+beforeEach(() => {
+  mockedUsePresentationSync.mockReturnValue(idleController());
+});
+
 afterEach(() => {
   cleanup();
   window.location.hash = "";
@@ -44,6 +64,101 @@ describe("PresenterRoute", () => {
     expect(window.location.hash).toBe("#scene/thesis/substrate");
   });
 
+  it("mounts presenter synchronization beside stable navigation and publishes canonical hashes", async () => {
+    window.location.hash = "#scene/thesis/substrate";
+    render(<PresenterRoute />);
+
+    const navigation = screen.getByRole("navigation", { name: /presenter note navigation/i });
+    expect(navigation).toContainElement(screen.getByRole("button", { name: /pair presentation/i }));
+    expect(screen.getByRole("link", { name: /^Next →$/i })).toHaveAttribute(
+      "href",
+      "#scene/problem/direct-actions",
+    );
+    expect(screen.getAllByRole("link", { name: /Where is the AI agent/i })[0]).toHaveAttribute(
+      "href",
+      "#discuss/where-is-ai-agent",
+    );
+    expect(mockedUsePresentationSync).toHaveBeenLastCalledWith(expect.objectContaining({
+      role: "presenter",
+      currentHash: "#scene/thesis/substrate",
+    }));
+
+    await userEvent.click(screen.getByRole("link", { name: /previous/i }));
+    expect(window.location.hash).toBe("#scene/thesis/title");
+    fireEvent(window, new HashChangeEvent("hashchange"));
+    expect(mockedUsePresentationSync).toHaveBeenLastCalledWith(expect.objectContaining({
+      currentHash: "#scene/thesis/title",
+    }));
+  });
+
+  it("applies audience hashes to notes and Q&A without publishing the old hash", () => {
+    window.location.hash = "#scene/thesis/title";
+    render(<PresenterRoute />);
+    const applyRemoteHash = mockedUsePresentationSync.mock.calls.at(-1)?.[0].applyRemoteHash;
+    expect(applyRemoteHash).toBeDefined();
+
+    act(() => {
+      applyRemoteHash?.("#scene/problem/direct-actions");
+      fireEvent(window, new HashChangeEvent("hashchange"));
+    });
+    expect(screen.getByRole("region", { name: "Beat goal" })).toHaveTextContent(
+      /Show why one successful chat is not yet automation/i,
+    );
+    expect(window.location.hash).toBe("#scene/problem/direct-actions");
+
+    act(() => {
+      applyRemoteHash?.("#discuss/where-is-ai-agent");
+      fireEvent(window, new HashChangeEvent("hashchange"));
+    });
+    expect(screen.getByRole("heading", { name: /Where is the AI agent/i })).toBeInTheDocument();
+    expect(mockedUsePresentationSync).toHaveBeenLastCalledWith(expect.objectContaining({
+      currentHash: "#discuss/where-is-ai-agent",
+    }));
+  });
+
+  it("ends presenter sessions after confirmation and displays ended state", async () => {
+    let controllerState: PresentationSyncController["state"] = {
+      kind: "connected",
+      grant: {
+        sessionId: "session-1",
+        code: "ABC123",
+        connectionToken: "token",
+        websocketPath: "/api/presentation-sync/ws",
+        snapshot: { hash: "#scene/thesis/title", revision: 1 },
+      },
+      snapshot: { hash: "#scene/thesis/title", revision: 1 },
+      presence: { presenters: 1, audience: 1 },
+    };
+    const controller = {
+      ...idleController(),
+      get state() { return controllerState; },
+    };
+    mockedUsePresentationSync.mockReturnValue(controller);
+    const { rerender } = render(<PresenterRoute />);
+
+    await userEvent.click(screen.getByRole("button", { name: "End presentation" }));
+    await userEvent.click(screen.getByRole("button", { name: "End presentation now" }));
+    expect(controller.endSession).toHaveBeenCalledOnce();
+
+    controllerState = { kind: "ended", reason: "presenter_ended" };
+    rerender(<PresenterRoute />);
+    expect(screen.getByText("The presenter ended this session.")).toBeInTheDocument();
+  });
+
+  it("keeps local navigation available after synchronization fails", () => {
+    mockedUsePresentationSync.mockReturnValue({
+      ...idleController(),
+      state: { kind: "failed", message: "Socket unavailable", retryable: true },
+    });
+    window.location.hash = "#scene/thesis/title";
+    render(<PresenterRoute />);
+
+    fireEvent.keyDown(window, { key: "ArrowRight" });
+
+    expect(window.location.hash).toBe("#scene/thesis/substrate");
+    expect(screen.getByRole("alert")).toHaveTextContent("Socket unavailable");
+  });
+
   it("advances from the latest hash during rapid consecutive navigation", () => {
     window.location.hash = "#scene/thesis/title";
     render(<PresenterRoute />);

web/apps/console/src/presentation/presenter/PresenterRoute.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useState } from "react";
 import { findDiscussionBranch } from "../storyboard.js";
+import { usePresentationSync } from "../sync/usePresentationSync.js";
 import { PresenterNote } from "./PresenterNote.js";
 import { PresenterNavigationBar } from "./PresenterNavigationBar.js";
 import { PresenterShell } from "./PresenterShell.js";
@@ -19,6 +20,14 @@ const moveFromCurrentHash = (direction: "next" | "previous") => {
 export const PresenterRoute = () => {
   const [navigation, setNavigation] = useState(readHash);
   const [covered, setCovered] = useState<ReadonlySet<string>>(() => new Set());
+  const presentationSync = usePresentationSync({
+    role: "presenter",
+    currentHash: window.location.hash || "#scene/thesis/title",
+    applyRemoteHash: (hash) => {
+      // Hash assignment keeps the existing parser as the single navigation path.
+      if (window.location.hash !== hash) window.location.hash = hash;
+    },
+  });
 
   useEffect(() => {
     const syncHash = () => setNavigation(readHash());
@@ -62,6 +71,7 @@ export const PresenterRoute = () => {
           total={presenterNotes.length}
           previous={navigation.previous}
           next={navigation.next}
+          syncController={presentationSync}
         />
       )}
       {navigation.note && (

web/apps/console/src/presentation/presenter/presenter.css

@@ -37,9 +37,9 @@
 .presenter-sidebar__qna a[aria-current="page"] { color: #155b49; font-weight: 700; }
 
 .presenter-route__reader { min-width: 0; padding: 1.25rem clamp(1.5rem, 5vw, 6rem) 5rem; touch-action: pan-y; }
-.presenter-navigation { max-width: 72ch; min-height: 2.5rem; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem; margin: 0 auto 2rem; border-bottom: 1px solid #d7d5d0; color: #67655f; font: 0.78rem "IBM Plex Mono", monospace; }
+.presenter-navigation { max-width: 72ch; min-height: 2.5rem; display: grid; grid-template-columns: 1fr auto 1fr auto; align-items: center; gap: 1rem; margin: 0 auto 2rem; border-bottom: 1px solid #d7d5d0; color: #67655f; font: 0.78rem "IBM Plex Mono", monospace; }
 .presenter-navigation a { color: #155b49; font-weight: 650; text-decoration: none; }
-.presenter-navigation a:last-child, .presenter-navigation > span:last-child { text-align: right; }
+.presenter-navigation > a:nth-child(3), .presenter-navigation > span:nth-child(3) { text-align: right; }
 .presenter-navigation [aria-disabled="true"] { opacity: 0.35; }
 .presenter-note, .presenter-qna { max-width: 72ch; margin: 0 auto; }
 .presenter-note__header { display: flex; justify-content: space-between; gap: 2rem; padding-bottom: 1rem; border-bottom: 2px solid #20201e; }
@@ -77,7 +77,26 @@
   .presenter-route { grid-template-columns: 1fr; }
   .presenter-sidebar { position: static; height: auto; max-height: 15rem; border-right: 0; border-bottom: 1px solid #d7d5d0; }
   .presenter-sidebar ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
-  .presenter-navigation { position: sticky; top: 0; z-index: 3; margin-inline: -0.5rem; padding-inline: 0.5rem; background: #f7f7f5; }
+  .presenter-navigation {
+    position: sticky;
+    top: 0;
+    z-index: 3;
+    isolation: isolate;
+    padding-inline: 0.5rem;
+    border-bottom: 0;
+  }
+  /* Extend the sticky surface without replacing the nav's centered auto margins. */
+  .presenter-navigation::before {
+    content: "";
+    position: absolute;
+    inset: 0 auto 0 50%;
+    z-index: -1;
+    width: 100vw;
+    transform: translateX(-50%);
+    border-bottom: 1px solid #d7d5d0;
+    background: #f7f7f5;
+    pointer-events: none;
+  }
   .presenter-note__goal p { font-size: 1.42rem; }
 }