feat: add 'cookie' as a storage strategy for storing the theme

[trm217]

Cookies

This PR is built on top of #293 and adds a 'cookie' as the third option for the ThemeProviders 'storage' property.

#### Tasks

• Update ThemeProvider to handle storage='cookie'
• Update ThemeScript to handle storage='cookie'
• Add tests for storage='cookie'
• Update documentation
• [-] Add a event listener to handle the cookies being changed in order to sync the selected theme across multiple browser-windows (just as we already do with localStorage)
  • I couldn't find a reliable way to do this. There seems to be an event-listener related to the cookieStore API, however this still is an experimental feature.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
next-themes-basic	❌ Failed (Inspect)			Nov 1, 2024 9:26pm
next-themes-tailwind	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 1, 2024 9:26pm
next-themes-with-app-dir	❌ Failed (Inspect)			Nov 1, 2024 9:26pm

[wontory]

I really need this feature. While structuring my app as a monorepo, I expect it will become possible to share themes among different domains.

[trm217]

@wontory Just waiting for @pacocoursey review.
Give it some time. If it's urgent, you can easily write a wrapper that syncs to a cookie (and initialises from it).

[touka-0]

any update? wait for long...

[trm217]

@touka-0 No update. The repository no longer appears to be maintained.