Re-implement “turned-off” effect of < and > buttons on first and last chapter

[Palloxin]

Describe your suggested feature

Stable:

Beta:

https://github.com/user-attachments/assets/612f7c14-6118-49ef-b16c-2ebcec2e9d55

Stable effect is better.

Other details

No response

Acknowledgements

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• [X] I have written a short but informative title.
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• [X] I have updated the app to version 2.0.0.
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