Fix dark theme gradient for expand button on long Hadith

[rana-shoaib]

Resolved an issue where the 'expand more content' button for long Hadith was missing the dark theme gradient, ensuring consistent styling.

[ahadith]

Jazakallahu khayr!

Could we trouble you to take care of a couple more minor issues that arose with the dark mode?

1. I think there's a better color out there for the permalink text
   
   (specifically, the "Sahih al-Bukhari 2" link). If you could do a bit of research on usability websites to find the best color, that would be great

2. The header in the search results is too bright.
   

[ahadith]

Also let us know if there's a way to reach you over email/Signal.

[rana-shoaib]

Also let us know if there's a way to reach you over email/Signal.
ranashoaibg073@gmail.com

[Yugi-2]

Jazakallahu khayr!

Could we trouble you to take care of a couple more minor issues that arose with the dark mode?

1. I think there's a better color out there for the permalink text
   ![Screenshot from 2024-10-06 17-53-34](https://private-user-images.githubusercontent.com/22137719/374363294-66ff62c3-56e8-443e-aec6-d4b21b45eb5f.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.O0tMZ6QgCOZGoyXzGEEB7PyYA1qHDLP0b-T1WiGhvkc)
   (specifically, the "Sahih al-Bukhari 2" link). If you could do a bit of research on usability websites to find the best color, that would be great

2. The header in the search results is too bright.
   ![signal-2024-10-07-112210_002](https://private-user-images.githubusercontent.com/22137719/374363445-68e28012-c9bf-406b-a784-4b3c765529c7.jpg?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.SmLcQC93lAedVnX5G2LPzHkp_UDEE1_45tyoQuk1LjU)

@rana-shoaib Can you address these two concerns in this PR as well?