Secondary paths to be covered by end-to-end testing

[uier]

While #110 covered the most essential use cases that have been frequently used, we also find some worth testing cases.

Anyone is welcome to contribute these test cases.

• 測試 sidebar 在 mini 和未 mini 的情況下皆能成功讓使用者點擊並執行正確的操作（連結到其他頁面、Toggle dark mode）
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