feat(chat): terminal chat parity for every tool; Desktop-like artifacts

- The chat over a terminal pane now covers Claude, Codex, omp, Cursor and
  Antigravity: Cursor's agent transcript and agy's step log
  (brain/<id>/.system_generated/logs/transcript_full.jsonl) are read as
  conversations; Cursor sessions are claimed by their workspace
- Replies appear as soon as they are written: the projects-tree watcher
  broadcasts `transcript_changed` (at most every 250 ms per session) and the
  chat re-reads the transcript while the terminal underneath draws
- Stop shows from the pane's own busy line (Claude/Codex `esc to interrupt`,
  agy `… esc to cancel`), or fresh output for omp/Cursor — no hooks needed
- Permission prompts read off the terminal become a card with the tool, its
  command and "Deny with a note"; Codex gets Permission mode / Model buttons
  that open its own numbered pickers, answered from the menu card
- Artifacts: cards for pages/documents/diagrams/tables/React components, a
  Preview | Code panel with versions, copy, download, save to the Artifacts
  Hub, full screen; sandboxed iframes without allow-same-origin
- Claude panes get CLAUDE_CODE_ENABLE_TODO_TOOLS=1 so the Progress panel has a
  plan; multi-question pane menus read their Next row and question tabs
- The realtime chat bridge (structured stdio, /api/chat-bridge, /ws-chat)
  from the unreleased ad9d475 is not kept

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

@@ -31,6 +31,10 @@ vi.mock("../../../lib/api", async (importOriginal) => {
         }),
         gitRawUrl: () => "",
       },
+      artifacts: {
+        pinFile: vi.fn().mockResolvedValue({ item: { id: 1 } }),
+        uploadFile: vi.fn().mockResolvedValue({ item: { id: 2 } }),
+      },
       sessions: {
         readImageUrl: (id: string, p: string) => `/img/${id}?path=${p}`,
         readFile: vi.fn((_id: string, p: string) =>
@@ -75,7 +79,11 @@ const scope = { laneId: 4, laneCwd: "/w", cwd: "/w", sessionId: "s1" };
 describe("FilePreview", () => {
   it("reads a workspace file through the lane", async () => {
     render(<FilePreview path="/w/src/a.ts" scope={scope} onClose={() => {}} />);
-    expect(await screen.findByText("export const a = 1;")).toBeTruthy();
+    expect(
+      await screen.findByText(
+        (_t, el) => el?.tagName === "CODE" && !!el.textContent?.includes("export const a = 1;")
+      )
+    ).toBeTruthy();
     expect(vi.mocked(api.lanes.gitFile)).toHaveBeenCalledWith(4, "src/a.ts");
   });
 
@@ -89,7 +97,11 @@ describe("FilePreview", () => {
   it("reads Windows paths the same way", async () => {
     const win = { laneId: 4, laneCwd: "D:\\w", cwd: "D:\\w", sessionId: "s1" };
     render(<FilePreview path={"D:\\w\\src\\a.ts"} scope={win} onClose={() => {}} />);
-    expect(await screen.findByText("export const a = 1;")).toBeTruthy();
+    expect(
+      await screen.findByText(
+        (_t, el) => el?.tagName === "CODE" && !!el.textContent?.includes("export const a = 1;")
+      )
+    ).toBeTruthy();
     expect(vi.mocked(api.lanes.gitFile)).toHaveBeenCalledWith(4, "src/a.ts");
     cleanup();
     const tool = "C:\\Users\\k\\.claude\\projects\\D--w\\s1\\tool-results\\b.txt";
@@ -144,7 +156,11 @@ describe("FileListModal", () => {
     );
     expect(screen.getByText("No preview for this file here")).toBeTruthy();
     fireEvent.click(screen.getByRole("button", { name: "a.ts" }));
-    expect(await screen.findByText("export const a = 1;")).toBeTruthy();
+    expect(
+      await screen.findByText(
+        (_t, el) => el?.tagName === "CODE" && !!el.textContent?.includes("export const a = 1;")
+      )
+    ).toBeTruthy();
   });
 });
 
@@ -172,3 +188,77 @@ describe("SkillListModal", () => {
     expect(screen.getByText("No preview for this file here")).toBeTruthy();
   });
 });
+
+describe("the artifact view", () => {
+  const html = (lines: string[]) =>
+    vi.mocked(api.lanes.gitFile).mockResolvedValueOnce({
+      available: true,
+      path: "page.html",
+      rev: "work",
+      binary: false,
+      truncated: false,
+      lines,
+    } as never);
+
+  it("runs a page in a sandbox with scripts but no same origin, and shows its code", async () => {
+    html(["<button>go</button>"]);
+    render(<FilePreview path="/w/page.html" scope={scope} onClose={() => {}} />);
+    const frame = (await screen.findByTestId("artifact-frame")) as HTMLIFrameElement;
+    expect(frame.getAttribute("sandbox")).toContain("allow-scripts");
+    expect(frame.getAttribute("sandbox")).not.toContain("allow-same-origin");
+    expect(frame.getAttribute("srcdoc")).toContain("<button>go</button>");
+    fireEvent.click(screen.getByTestId("artifact-tab-code"));
+    expect(screen.queryByTestId("artifact-frame")).toBeNull();
+    expect(
+      await screen.findByText(
+        (_t, el) => el?.tagName === "CODE" && !!el.textContent?.includes("<button>go</button>")
+      )
+    ).toBeTruthy();
+    cleanup();
+  });
+
+  it("steps back to an older version the conversation wrote", async () => {
+    html(["<p>two</p>"]);
+    const tool = (id: string, input: Record<string, unknown>, name = "Write") => ({
+      type: "assistant" as const,
+      timestamp: null,
+      content: [{ type: "tool_use" as const, id, name, input }],
+    });
+    const messages = [
+      tool("1", { file_path: "/w/page.html", content: "<p>one</p>" }),
+      tool("2", { file_path: "/w/page.html", old_string: "one", new_string: "two" }, "Edit"),
+    ];
+    render(
+      <FilePreview
+        path="/w/page.html"
+        scope={scope}
+        onClose={() => {}}
+        messages={messages as never}
+      />
+    );
+    const versions = await screen.findByTestId("artifact-versions");
+    expect(versions.textContent).toContain("2");
+    expect(
+      ((await screen.findByTestId("artifact-frame")) as HTMLIFrameElement).getAttribute("srcdoc")
+    ).toContain("two");
+    fireEvent.click(versions.querySelector("button")!);
+    expect(screen.getByTestId("artifact-frame").getAttribute("srcdoc")).toContain("<p>one</p>");
+    cleanup();
+  });
+
+  it("saves a workspace file to the Artifacts library by its path", async () => {
+    html(["<p>x</p>"]);
+    render(<FilePreview path="/w/page.html" scope={scope} onClose={() => {}} />);
+    await screen.findByTestId("artifact-frame");
+    fireEvent.click(screen.getByTestId("artifact-share"));
+    await vi.waitFor(() =>
+      expect(api.artifacts.pinFile).toHaveBeenCalledWith({
+        laneId: 4,
+        path: "page.html",
+        title: "page.html",
+        sessionId: "s1",
+      })
+    );
+    cleanup();
+  });
+});

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

@@ -7,9 +7,11 @@
  * activity panel, collapsed into a file button with the output count, whose
  * files open a preview in its place; a file in a turn's "Edited N files" card
  * opens in the Workspace's Changes panel when it is in the pane's folder; and
- * Stop in Send's place while the main agent works, pressing Esc in the pane;
+ * Stop in Send's place while the main agent works (its hooks, or the pane's
+ * own busy line / fresh output), pressing Esc in the pane;
  * and the menu the CLI asks with, shown as buttons that press its keys, a
- * message sent meanwhile typed as its "Type something" answer.
+ * message sent meanwhile typed as its "Type something" answer; a Codex
+ * terminal's Model / Permission mode buttons typing its own pickers.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -22,11 +24,14 @@ import {
   answerRunMenu,
   chooseRunOption,
   interruptRun,
+  onPaneOutput,
+  readRunBusy,
   readRunMenu,
   submitToRun,
   type PaneMenu,
 } from "../../../lib/panePaste";
 import { OPEN_IN_CHANGES_EVENT } from "../../../lib/openInChanges";
+import { eventBus } from "../../../lib/eventBus";
 
 vi.mock("../../conversation/ConversationView", () => ({
   // Stands in for a turn's "Edited N files" card: a click names a file.
@@ -51,8 +56,12 @@ vi.mock("../../../lib/panePaste", () => ({
   submitToRun: vi.fn(() => true),
   interruptRun: vi.fn(() => true),
   readRunMenu: vi.fn(() => null),
+  readRunBusy: vi.fn(() => false),
   chooseRunOption: vi.fn(() => true),
   answerRunMenu: vi.fn(() => true),
+  stepRunMenu: vi.fn(() => true),
+  notePaneFocus: vi.fn(),
+  onPaneOutput: vi.fn(() => () => {}),
 }));
 vi.mock("../../../lib/api", async (importOriginal) => {
   const actual = await importOriginal<Record<string, unknown>>();
@@ -212,6 +221,54 @@ describe("PaneChat — Stop", () => {
     }
   });
 
+  it("shows Stop while the pane's own busy line shows, with no hook saying so", async () => {
+    // omp, Cursor or Codex without its hooks: only the terminal knows.
+    vi.useFakeTimers({ shouldAdvanceTime: true });
+    vi.mocked(readRunBusy).mockReturnValue(true);
+    try {
+      renderChat();
+      expect(await screen.findByTestId("pane-chat-stop")).toBeInTheDocument();
+      expect(readRunBusy).toHaveBeenCalledWith("agenthub-lane-1", "claude");
+      vi.mocked(readRunBusy).mockReturnValue(false);
+      await act(async () => {
+        await vi.advanceTimersByTimeAsync(800);
+      });
+      await waitFor(() => expect(screen.queryByTestId("pane-chat-stop")).toBeNull());
+    } finally {
+      vi.useRealTimers();
+      vi.mocked(readRunBusy).mockReturnValue(false);
+    }
+  });
+
+  it("counts a tool with no known busy line as working while its pane draws", async () => {
+    vi.useFakeTimers({ shouldAdvanceTime: true });
+    vi.mocked(readRunBusy).mockReturnValue(null);
+    const fns: (() => void)[] = [];
+    vi.mocked(onPaneOutput).mockImplementation((_runId, fn) => {
+      fns.push(fn);
+      return () => {};
+    });
+    try {
+      renderChat();
+      await waitFor(() => expect(fns.length).toBeGreaterThan(0));
+      expect(screen.queryByTestId("pane-chat-stop")).toBeNull();
+      fns.forEach((fn) => fn());
+      await act(async () => {
+        await vi.advanceTimersByTimeAsync(800);
+      });
+      expect(await screen.findByTestId("pane-chat-stop")).toBeInTheDocument();
+      // Quiet for longer than OUTPUT_BUSY_MS: at rest again.
+      await act(async () => {
+        await vi.advanceTimersByTimeAsync(2800);
+      });
+      await waitFor(() => expect(screen.queryByTestId("pane-chat-stop")).toBeNull());
+    } finally {
+      vi.useRealTimers();
+      vi.mocked(readRunBusy).mockReturnValue(false);
+      vi.mocked(onPaneOutput).mockImplementation(() => () => {});
+    }
+  });
+
   it("keeps Send for a session at rest", async () => {
     // With session_id the server answers EVERY agent of the session (its
     // status filter does not apply): the main agent is there, waiting.
@@ -553,4 +610,103 @@ describe("PaneChat — a menu the CLI asks with", () => {
       vi.mocked(readRunMenu).mockReturnValue(null);
     }
   });
+
+  it("re-reads its transcript when the pane draws, at most once a second", async () => {
+    // Every listener the chat put on the pane (the re-read, the busy clock).
+    const fns: (() => void)[] = [];
+    const drew = () => fns.forEach((fn) => fn());
+    vi.mocked(onPaneOutput).mockImplementation((_runId, fn) => {
+      fns.push(fn);
+      return () => {};
+    });
+    const seen: unknown[] = [];
+    const off = eventBus.subscribe((m) => {
+      if (m.type === "transcript_changed") seen.push(m.data);
+    });
+    try {
+      renderChat();
+      await waitFor(() => expect(fns.length).toBeGreaterThan(0));
+      vi.useFakeTimers();
+      drew();
+      drew();
+      drew();
+      expect(seen).toEqual([{ session_id: "s1" }]);
+      await act(async () => {
+        await vi.advanceTimersByTimeAsync(1100);
+      });
+      expect(seen).toHaveLength(2);
+    } finally {
+      vi.useRealTimers();
+      off();
+      vi.mocked(onPaneOutput).mockImplementation(() => () => {});
+    }
+  });
+
+  const PERMISSION: PaneMenu = {
+    question: "Do you want to proceed?",
+    detail: ["Bash command", "npm test", "Run the tests"],
+    options: [
+      { n: 1, label: "Yes", hint: "", checked: null },
+      { n: 2, label: "Yes, and don't ask again for npm test", hint: "", checked: null },
+      { n: 3, label: "No, and tell Claude what to do differently (esc)", hint: "", checked: null },
+    ],
+    cursor: 0,
+    multi: false,
+    typeAt: -1,
+  };
+
+  it("lays a permission prompt out as a card, each answer its own key", async () => {
+    vi.mocked(readRunMenu).mockReturnValue(PERMISSION);
+    vi.mocked(chooseRunOption).mockClear();
+    try {
+      renderChat();
+      const card = await screen.findByTestId("pane-chat-permission");
+      expect(card).toHaveTextContent("Bash command");
+      expect(card).toHaveTextContent("npm test");
+      expect(card).toHaveTextContent("Do you want to proceed?");
+      const options = screen.getAllByTestId("pane-chat-permission-option");
+      // The key hint is dropped from the label.
+      expect(options.map((o) => o.textContent)).toEqual([
+        "Yes",
+        "Yes, and don't ask again for npm test",
+        "No, and tell Claude what to do differently",
+      ]);
+      fireEvent.click(options[1]!);
+      expect(chooseRunOption).toHaveBeenCalledWith("agenthub-lane-1", PERMISSION, 1);
+    } finally {
+      vi.mocked(readRunMenu).mockReturnValue(null);
+    }
+  });
+
+  it("denies with a note: picks the No row, then sends the note as the next message", async () => {
+    vi.mocked(readRunMenu).mockReturnValue(PERMISSION);
+    vi.mocked(chooseRunOption).mockClear();
+    vi.mocked(submitToRun).mockClear();
+    try {
+      renderChat();
+      fireEvent.click(await screen.findByTestId("pane-chat-permission-tell"));
+      const field = screen.getByTestId("pane-chat-permission-note");
+      fireEvent.change(field, { target: { value: "use pnpm" } });
+      fireEvent.keyDown(field, { key: "Enter" });
+      expect(chooseRunOption).toHaveBeenCalledWith("agenthub-lane-1", PERMISSION, 2);
+      await waitFor(() => expect(submitToRun).toHaveBeenCalled(), { timeout: 2000 });
+      expect(vi.mocked(submitToRun).mock.calls[0]![1]).toContain("use pnpm");
+    } finally {
+      vi.mocked(readRunMenu).mockReturnValue(null);
+    }
+  });
+});
+
+describe("PaneChat — a Codex terminal", () => {
+  it("types /model and /permissions, whose pickers come back as menu cards", () => {
+    renderChat({ tool: "codex" });
+    fireEvent.click(screen.getByTestId("pane-chat-codex-model"));
+    fireEvent.click(screen.getByTestId("pane-chat-codex-permissions"));
+    expect(vi.mocked(submitToRun).mock.calls.map((c) => c[1])).toEqual(["/model", "/permissions"]);
+  });
+
+  it("offers neither to a Claude pane", () => {
+    renderChat();
+    expect(screen.queryByTestId("pane-chat-codex-model")).toBeNull();
+  });
 });