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/conversation/__tests__/ConversationView.pushed.test.tsx

@@ -0,0 +1,74 @@
+/**
+ * @file ConversationView.pushed.test.tsx
+ * @description The server says a session's transcript grew
+ * (`transcript_changed`): the chat showing that session reads the new lines
+ * at once, and again within a short window after a burst — not at the hook
+ * throttle's 1.5 s pace — while another session's notice fetches nothing.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { act, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { ConversationView } from "../ConversationView";
+import { api } from "../../../lib/api";
+import { eventBus } from "../../../lib/eventBus";
+
+vi.mock("../../../lib/api", async (importOriginal) => {
+  const actual = await importOriginal<Record<string, unknown>>();
+  return {
+    ...actual,
+    api: {
+      sessions: {
+        transcripts: vi.fn(async () => ({ transcripts: [] })),
+        transcript: vi.fn(async () => ({
+          messages: [
+            {
+              type: "user",
+              content: [{ type: "text", text: "hello" }],
+              timestamp: "2026-10-21T00:00:00Z",
+            },
+          ],
+          total: 1,
+          has_more: false,
+          first_line: 1,
+          last_line: 1,
+        })),
+      },
+    },
+  };
+});
+
+afterEach(() => {
+  vi.useRealTimers();
+  vi.clearAllMocks();
+});
+
+const pushed = (session_id: string) =>
+  act(() => eventBus.publish({ type: "transcript_changed", data: { session_id } } as never));
+const calls = () => vi.mocked(api.sessions.transcript).mock.calls.length;
+
+describe("ConversationView on transcript_changed", () => {
+  it("reads its own session's new lines at once, and a burst within 300 ms", async () => {
+    render(<ConversationView sessionId="s1" fill live />);
+    await screen.findByText("hello");
+    vi.useFakeTimers();
+    const before = calls();
+    pushed("s1");
+    expect(calls()).toBe(before + 1);
+    pushed("s1");
+    pushed("s1");
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(350);
+    });
+    expect(calls()).toBe(before + 2);
+  });
+
+  it("ignores another session's transcript", async () => {
+    render(<ConversationView sessionId="s1" fill live />);
+    await screen.findByText("hello");
+    const before = calls();
+    pushed("s2");
+    await act(async () => {});
+    expect(calls()).toBe(before);
+  });
+});