优化编号讲解布局与返回流程

- 将讲解编号置于标题上方并增强辨识度
- 编号详情返回后保留输入界面并清空原编号
- 增加页面栈丢失时恢复编号输入页的兜底逻辑
- 补充编号布局和返回流程回归测试

Made-with: Proma

tests/unit/ExplainHallSelect.spec.ts

@@ -95,6 +95,11 @@ describe('讲解展厅选择列表', () => {
     expect(wrapper.emitted('codeSubmit')).toEqual([['0231']])
     expect(wrapper.find('.code-entry-sheet').exists()).toBe(true)
 
+    wrapper.vm.completeCodeEntry()
+    await wrapper.vm.$nextTick()
+    expect(wrapper.find('.code-entry-sheet').exists()).toBe(true)
+    expect(wrapper.findAll('.code-digit-value').map((item) => item.text())).toEqual(['', '', '', ''])
+
     await wrapper.setProps({ codeSubmitting: true })
     expect(wrapper.get('.code-entry-native-input').attributes('disabled')).toBeDefined()
     expect(wrapper.get('.code-entry-action.primary').text()).toBe('正在查询')