FN-6036: restore SettingsModal workflow-lane test cleanup

Restore the SettingsModal project models workflow-lane test setup so runs start from a clean browser state.

- import and call testing-library cleanup after each test
- reset timers, plugin UI slot cache, and browser storage in test hooks
- unstub globals during teardown to prevent cross-test leakage

Files changed:
 .../dashboard/app/components/__tests__/SettingsModal.test.tsx | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-6036

Fusion-Task-Lineage: 69976a8b-272f-43a4-b61e-538993f930c8

packages/dashboard/app/components/__tests__/SettingsModal.test.tsx

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import type { ComponentProps } from "react";
-import { render, screen, fireEvent, waitFor, within, act } from "@testing-library/react";
+import { render, screen, fireEvent, waitFor, within, act, cleanup } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { EditorView } from "@codemirror/view";
 import { SettingsModal } from "../SettingsModal";
@@ -517,7 +517,10 @@ describe("SettingsModal", () => {
 
 
   beforeEach(() => {
+    vi.useRealTimers();
     vi.clearAllMocks();
+    localStorage.clear();
+    sessionStorage.clear();
     clearPluginUiSlotsCache();
     mockUseMobileKeyboard.mockReturnValue({
       keyboardOpen: false,
@@ -762,6 +765,12 @@ describe("SettingsModal", () => {
   });
 
   afterEach(() => {
+    cleanup();
+    clearPluginUiSlotsCache();
+    localStorage.clear();
+    sessionStorage.clear();
+    vi.useRealTimers();
+    vi.unstubAllGlobals();
     vi.restoreAllMocks();
   });