fix(snapline): snapline cannot show when zoomed

[HawtinZeng]

This PR have not passed the test, because of some unrelated errors.

And the jest systax error: jest-runner\build\index.js: Class private methods are not enabled

[changeset-bot]

⚠️ No Changeset found

Latest commit: c22e33c

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[ChangeSuger]

👍，感谢 PR，这边提两个修改建议：

1. 建议修改变量命名：epsino (?) -> spsilon ( $\epsilon$ )
2. 目前只修改了 getHorizontalSnapline 方法（水平对齐辅助线），getVerticalSnapline 方法（垂直对齐辅助线）建议也一并修改

[HawtinZeng]

OK