RFR: 8342705: Add dark mode for docs [v2]

[Hannes Wallnöfer]

On Thu, 17 Jul 2025 11:52:37 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

>> Please review an enhancement to add a dark theme to javadoc-generated API documentation. There is a new button in the top right corner that brings up a menu to switch between themes. Available options are "Light", "Dark", and "System Setting" (following the system-wide theme setting). The selected theme is stored and preserved across browser sessions.
>> 
>> Generated docs [can be viewed here](https://cr.openjdk.org/~hannesw/8342705/api.03/java.base/java/lang/package-summary.html) (module `java.base` only). 
>> 
>> Screenshots below show both themes and how to switch between them.
>> 
>> <img width="1155" height="743" alt="light-theme" src="https://github.com/user-attachments/assets/d3b5703d-67d0-4f70-b8e4-39de13b74600" />
>> <img width="1155" height="742" alt="dark-theme" src="https://github.com/user-attachments/assets/ab6f479b-df94-42bf-9c87-eea3978f38f1" />
>
> Hannes Wallnöfer has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 10 commits:
> 
>  - Update search tag highlight colors
>  - Update link colors
>  - Merge branch 'master' into JDK-8342705
>  - Finalize dark theme
>  - Fix icon colors for dark theme
>  - Improve theme support
>  - Set light theme by default
>  - Improve dark theme, implement theme switcher
>  - Merge branch 'master' into JDK-8342705
>  - JDK-8342705: Add dark mode for docs

I updated the PR with changes described in my previous comment.

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PR Comment: https://git.openjdk.org/jdk/pull/26185#issuecomment-3083766307