feat(navbar): toggle theme inside navbar

[ldez]

The PR is the same as #499 but updated to Tailwind 4 and with some minor changes.

To answer the question about 12/24. (https://github.com/imfing/hextra/pull/499/files#r1874791928)

12 is the height of the icons/svg inside the theme toggle:

• hextra/layouts/_partials/theme-toggle.html

  Line 16 in f79bd1a

  {{- partial "utils/icon.html" (dict "name" "sun" "attributes" "height=12 class=\"hx:group-data-[theme=light]:hidden\"") -}}

• hextra/layouts/_partials/theme-toggle.html

  Line 18 in f79bd1a

  {{- partial "utils/icon.html" (dict "name" "moon" "attributes" "height=12 class=\"hx:group-data-[theme=dark]:hidden\"") -}}

24 is the height of the icons/svg inside the navbar:

• hextra/layouts/_partials/navbar.html

  Line 36 in f79bd1a

  {{- partial "utils/icon.html" (dict "name" .Params.icon "attributes" "height=24") -}}

• hextra/layouts/_partials/navbar.html

  Line 97 in f79bd1a

  {{- partial "utils/icon.html" (dict "name" "hamburger-menu" "attributes" "height=24") -}}

Closes #499
Fixes #343

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[ldez]

I changed the implementation to use parameters for icon and text height instead of hardcoding the value based on .navbar.

The two approaches work; if you prefer one over the other, I can adjust the implementation accordingly.

[imfing]

Thanks! It looks good overall, with just a few small suggestions

[imfing]

tweaked the classes to make the styles consistent with other icons in the navbar

[imfing]

implementation looks good, let's add it to the documentation

[ldez]

I added the documentation, but I don't speak Chinese, Japanese, or Farsi.

I can use tools to translate it, but I cannot be sure of the translations.

[imfing]

I added the documentation, but I'm not speaking Chinese, Japanese, or Farsi.

I can use tools to translate it, but I cannot be sure of the translations.

thanks, it's totally fine. The translations were done by LLMs so I'm not sure either 😅