fix(测试数据生成器): 修复 Worker 取消失效与规则存储静默失败 (#69)

- 为生成任务引入 generationId，忽略过期 Worker 响应，避免取消后展示错误数据
- Worker 每 100 行让出事件循环，使 cancel 消息能被及时处理
- ruleStorage.setAll 返回写入结果，save/update/delete 在 QuotaExceeded 时返回失败
- 补充 useGenerator 与 ruleStorage 单元测试

src/utils/__tests__/ruleStorage.test.ts

@@ -0,0 +1,65 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import * as ruleStorage from '../ruleStorage';
+
+const STORAGE_KEY = 'testDataGenerator_rules';
+
+const mockField = {
+  id: 'field-1',
+  name: 'username',
+  generatorId: 'string',
+  params: {},
+  required: true,
+  nullRate: 0,
+  unique: false,
+};
+
+describe('ruleStorage', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    vi.restoreAllMocks();
+  });
+
+  it('save 在 localStorage 写入失败时应返回 null', () => {
+    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
+      throw new DOMException('QuotaExceededError');
+    });
+
+    const result = ruleStorage.save({
+      name: 'Test Rule',
+      fields: [mockField],
+    });
+
+    expect(result).toBeNull();
+    expect(localStorage.getItem(STORAGE_KEY)).toBeNull();
+  });
+
+  it('update 在 localStorage 写入失败时应返回 null', () => {
+    const saved = ruleStorage.save({
+      name: 'Test Rule',
+      fields: [mockField],
+    });
+    expect(saved).not.toBeNull();
+
+    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
+      throw new DOMException('QuotaExceededError');
+    });
+
+    const updated = ruleStorage.update(saved!.id, { name: 'Updated Rule' });
+    expect(updated).toBeNull();
+  });
+
+  it('deleteRule 在 localStorage 写入失败时应返回 false', () => {
+    const saved = ruleStorage.save({
+      name: 'Test Rule',
+      fields: [mockField],
+    });
+    expect(saved).not.toBeNull();
+
+    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
+      throw new DOMException('QuotaExceededError');
+    });
+
+    expect(ruleStorage.deleteRule(saved!.id)).toBe(false);
+    expect(ruleStorage.getById(saved!.id)).toBeDefined();
+  });
+});