test(canvas/chat): add AttachmentLightbox coverage (13 cases)

+ AttachmentLightbox.test.tsx: 13 cases across render states,
  interaction, and focus management for the shared fullscreen modal.

Per RFC #2991 Phase 2, AttachmentLightbox owns: backdrop + centered
viewport, Esc to close, click-outside to close, focus trap (focus
enters close button on open, restores on close), reduced-motion respect.

Coverage:
  - open=false → renders nothing
  - role=dialog + aria-modal + aria-label
  - Close button aria-label="Close preview"
  - Click backdrop → onClose (e.target === e.currentTarget)
  - Click content → onClose NOT called (stopPropagation)
  - Escape key → onClose
  - Focus moves to close button on open
  - Focus restores to previous element on close
  - motion-reduce class on backdrop

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

canvas/src/components/tabs/chat/__tests__/AttachmentLightbox.test.tsx

@@ -0,0 +1,214 @@
+// @vitest-environment jsdom
+/**
+ * AttachmentLightbox — shared fullscreen modal for image/PDF/preview.
+ *
+ * Per RFC #2991 Phase 2, AttachmentLightbox owns:
+ *   - Backdrop + centered viewport
+ *   - Esc to close
+ *   - Click-outside to close (stopPropagation on content)
+ *   - Focus trap: focus enters close button on open, restores on close
+ *   - prefers-reduced-motion respect
+ *
+ * NOTE: No @testing-library/jest-dom import — use textContent / className /
+ * getAttribute / checked / value checks to avoid jest-dom dependency errors.
+ *
+ * Covers:
+ *   - Does not render when open=false
+ *   - Renders dialog with role=dialog and aria-modal
+ *   - Renders with provided aria-label
+ *   - Close button has aria-label="Close preview"
+ *   - Clicking backdrop (outside content) calls onClose
+ *   - Clicking content does NOT call onClose (stopPropagation)
+ *   - Escape key calls onClose
+ *   - Focus moves to close button when opened
+ *   - Focus restores to previous element when closed
+ *   - Reduced motion: motion-reduce class on backdrop
+ *   - Renders children inside the modal
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import React from "react";
+
+import { AttachmentLightbox } from "../AttachmentLightbox";
+
+afterEach(() => {
+  cleanup();
+  vi.restoreAllMocks();
+  vi.resetModules();
+});
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+/** Renders the lightbox open with children and returns close fn */
+function renderOpen(props?: Partial<React.ComponentProps<typeof AttachmentLightbox>>) {
+  const onClose = vi.fn();
+  const result = render(
+    <AttachmentLightbox
+      open={true}
+      onClose={onClose}
+      ariaLabel="Image preview"
+      {...props}
+    >
+      <img alt="test" src="data:image/png;base64,iVBORw0KGgo=" />
+    </AttachmentLightbox>,
+  );
+  return { ...result, onClose };
+}
+
+// ─── Render States ────────────────────────────────────────────────────────────
+
+describe("AttachmentLightbox — render", () => {
+  it("does not render when open=false", () => {
+    const { container } = render(
+      <AttachmentLightbox
+        open={false}
+        onClose={vi.fn()}
+        ariaLabel="Preview"
+      >
+        <div>content</div>
+      </AttachmentLightbox>,
+    );
+    expect(container.firstChild).toBeNull();
+  });
+
+  it("renders dialog with role=dialog and aria-modal", () => {
+    renderOpen();
+    const dialog = document.querySelector('[role="dialog"]');
+    expect(dialog).toBeTruthy();
+    expect(dialog?.getAttribute("aria-modal")).toBe("true");
+  });
+
+  it("renders with provided aria-label", () => {
+    renderOpen({ ariaLabel: "PDF: report-2026.pdf" });
+    const dialog = document.querySelector('[role="dialog"]');
+    expect(dialog?.getAttribute("aria-label")).toBe("PDF: report-2026.pdf");
+  });
+
+  it("close button has aria-label='Close preview'", () => {
+    renderOpen();
+    const btn = document.querySelector('[aria-label="Close preview"]');
+    expect(btn).toBeTruthy();
+    expect(btn?.tagName).toBe("BUTTON");
+  });
+
+  it("renders children inside the modal", () => {
+    renderOpen({ ariaLabel: "Preview" });
+    // Children are inside the dialog
+    const dialog = document.querySelector('[role="dialog"]');
+    expect(dialog?.querySelector("img")).toBeTruthy();
+  });
+
+  it("applies reduced-motion class on backdrop", () => {
+    renderOpen();
+    // The div[role="dialog"] IS the fixed backdrop — contains motion-reduce:transition-none
+    const dialog = document.querySelector('[role="dialog"]') as HTMLElement;
+    expect(dialog?.className).toContain("motion-reduce");
+  });
+});
+
+// ─── Interaction ─────────────────────────────────────────────────────────────
+
+describe("AttachmentLightbox — interaction", () => {
+  it("calls onClose when close button is clicked", () => {
+    const onClose = vi.fn();
+    renderOpen({ onClose });
+    const btn = document.querySelector('[aria-label="Close preview"]') as HTMLButtonElement;
+    btn.click();
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+
+  it("calls onClose when backdrop (outside content) is clicked", () => {
+    const onClose = vi.fn();
+    renderOpen({ onClose });
+    // The div[role="dialog"] IS the backdrop (fixed inset-0).
+    // Click on it — e.target === e.currentTarget triggers onBackdropClick.
+    const backdrop = document.querySelector('[role="dialog"]') as HTMLElement;
+    fireEvent.click(backdrop, { target: backdrop });
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+
+  it("does NOT call onClose when content (inside modal) is clicked", () => {
+    const onClose = vi.fn();
+    renderOpen({ onClose });
+    // Click on the img inside the modal
+    const img = document.querySelector("img") as HTMLElement;
+    fireEvent.click(img);
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("calls onClose on Escape key", () => {
+    const onClose = vi.fn();
+    renderOpen({ onClose });
+    fireEvent.keyDown(document, { key: "Escape" });
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not call onClose for other keys", () => {
+    const onClose = vi.fn();
+    renderOpen({ onClose });
+    fireEvent.keyDown(document, { key: "Enter" });
+    fireEvent.keyDown(document, { key: "Tab" });
+    expect(onClose).not.toHaveBeenCalled();
+  });
+});
+
+// ─── Focus Management ────────────────────────────────────────────────────────
+
+describe("AttachmentLightbox — focus management", () => {
+  it("moves focus to close button when opened", () => {
+    renderOpen();
+    const btn = document.querySelector('[aria-label="Close preview"]') as HTMLButtonElement;
+    expect(document.activeElement).toBe(btn);
+  });
+
+  it("restores focus to previous element when closed", () => {
+    // Create a button to hold focus before opening the modal
+    const outerBtn = document.createElement("button");
+    outerBtn.textContent = "Open modal";
+    document.body.appendChild(outerBtn);
+    outerBtn.focus();
+    expect(document.activeElement).toBe(outerBtn);
+
+    const onClose = vi.fn();
+    const { rerender } = render(
+      <AttachmentLightbox
+        open={false}
+        onClose={onClose}
+        ariaLabel="Preview"
+      >
+        <div>content</div>
+      </AttachmentLightbox>,
+    );
+
+    // Open the modal
+    rerender(
+      <AttachmentLightbox
+        open={true}
+        onClose={onClose}
+        ariaLabel="Preview"
+      >
+        <div>content</div>
+      </AttachmentLightbox>,
+    );
+
+    // Focus should now be on close button
+    const btn = document.querySelector('[aria-label="Close preview"]') as HTMLButtonElement;
+    expect(document.activeElement).toBe(btn);
+
+    // Close the modal
+    rerender(
+      <AttachmentLightbox
+        open={false}
+        onClose={onClose}
+        ariaLabel="Preview"
+      >
+        <div>content</div>
+      </AttachmentLightbox>,
+    );
+
+    // Focus should be restored to outerBtn
+    expect(document.activeElement).toBe(outerBtn);
+
+    document.body.removeChild(outerBtn);
+  });
+});