feat(frontend): c2 tasks panel + history import (sprint 8 phase 2)

- Add getC2Tasks / listCallbackHistory / importC2 API functions + types
- useC2Tasks with 2500ms polling (stops when all tasks completed)
- useC2CallbackHistory, useImportC2 hooks
- C2TaskStatusBadge, C2TasksPanel (expandable output rows, polling indicator)
- C2CallbackPicker extracted as shared component (reused in both modals)
- ImportC2HistoryModal: 2-step callback picker → paginated history table
- SimulationFormPage: RT card + tasks panel share left grid column; Import C2 history button
- 37 new tests (api/c2, C2TasksPanel, ImportC2HistoryModal, SimulationFormPage panel visibility)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/tests/SimulationFormPage.test.tsx

@@ -332,3 +332,104 @@ describe('SimulationFormPage — Execute via C2 button visibility', () => {
     expect(screen.queryByTestId('c2-execute-btn')).toBeNull();
   });
 });
+
+describe('SimulationFormPage — C2 tasks panel visibility', () => {
+  let mock: MockAdapter;
+
+  beforeEach(() => {
+    mockRole = 'redteam';
+    mock = new MockAdapter(apiClient);
+    mock.onGet('/simulations/7').reply(200, BASE_SIM);
+  });
+
+  afterEach(() => {
+    mock.restore();
+  });
+
+  it('shows C2 tasks panel when c2 config exists (even with no tasks)', async () => {
+    mock.onGet('/engagements/42/c2-config').reply(200, {
+      has_token: true,
+      url: 'https://mythic.lab:7443',
+      verify_tls: true,
+    });
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+    await waitFor(() => {
+      expect(screen.getByTestId('c2-tasks-panel')).toBeInTheDocument();
+    });
+  });
+
+  it('hides C2 tasks panel when no c2 config and no tasks', async () => {
+    mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+    // Wait for page data to load then confirm no panel
+    await waitFor(() => {
+      expect(screen.getByLabelText(/^Name/i)).not.toBeDisabled();
+    });
+    expect(screen.queryByTestId('c2-tasks-panel')).toBeNull();
+  });
+
+  it('shows C2 tasks panel when tasks exist even without c2 config', async () => {
+    mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, {
+      tasks: [
+        {
+          id: 1,
+          mythic_task_display_id: 10,
+          callback_display_id: 1,
+          command: 'whoami',
+          params: null,
+          status: 'completed',
+          completed: true,
+          output: 'SYSTEM',
+          mapping_applied: false,
+          created_at: '2026-06-10T10:00:00',
+          completed_at: '2026-06-10T10:00:05',
+        },
+      ],
+    });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+    await waitFor(() => {
+      expect(screen.getByTestId('c2-tasks-panel')).toBeInTheDocument();
+    });
+  });
+
+  it('SOC role never sees C2 tasks panel', async () => {
+    mockRole = 'soc';
+    mock.onGet('/engagements/42/c2-config').reply(200, {
+      has_token: true,
+      url: 'https://mythic.lab:7443',
+      verify_tls: true,
+    });
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+    await waitFor(() => {
+      expect(screen.getByTestId('soc-blocked-banner')).toBeInTheDocument();
+    });
+    expect(screen.queryByTestId('c2-tasks-panel')).toBeNull();
+  });
+
+  it('shows Import C2 history button when c2 config exists', async () => {
+    mock.onGet('/engagements/42/c2-config').reply(200, {
+      has_token: true,
+      url: 'https://mythic.lab:7443',
+      verify_tls: true,
+    });
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+    await waitFor(() => {
+      expect(screen.getByTestId('c2-import-trigger-btn')).toBeInTheDocument();
+    });
+  });
+});