[Contibution]: Disable Posthog initialization when API key is missing to prevent errors for contributors

[alamenai]

Hi,

In the Posthog provider, we currently have this code:

if (typeof window !== "undefined") {
  posthog.init(process.env.NEXT_PUBLIC_POSTHOG_API_KEY!, {
    api_host: "https://app.posthog.com",
    capture_pageview: true,
    session_recording: {
      maskAllInputs: false,
    },
    // Enable debug mode in development
    loaded: (posthog) => {
      if (process.env.NODE_ENV === "development") posthog.debug()
    },
  })
}

For contributors who don’t have a Posthog key (or don’t intend to add one), navigating the components page currently throws errors.

I suggest updating the code to disable Posthog initialization when the API key is not provided, to prevent these errors and improve the developer experience.

If you confirm that, I can open the pull request.