test: 避免 Ops 图表测试使用保留组件名

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/views/admin/ops/components/__tests__/OpsErrorScopeCharts.spec.ts

@@ -30,7 +30,7 @@ vi.mock('vue-chartjs', async () => {
       template: '<div class="doughnut-stub" />',
     }),
     Line: defineComponent({
-      name: 'Line',
+      name: 'LineChartStub',
       props: {
         data: { type: Object, required: true },
         options: { type: Object, default: () => ({}) },