fix(gate-1): remove unused fireEvent import (#1011)

Mechanical lint fix. github-code-quality[bot] flagged unused
import on line 18 — fireEvent is imported but never referenced in
the test file. Removing it clears the code quality gate without
changing any test behaviour.

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

canvas/src/app/__tests__/orgs-page.test.tsx

@@ -15,7 +15,7 @@
  *   - Polling: provisioning orgs schedule a 5s refresh (fake timers)
  */
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
-import { render, screen, waitFor, cleanup, fireEvent } from "@testing-library/react";
+import { render, screen, waitFor, cleanup } from "@testing-library/react";
 
 // ── Hoisted mocks ────────────────────────────────────────────────────────────
 // vi.mock factories are hoisted above imports; any captured references must