Reenable GraphQL playground in dev only

[ekzyis]

Description

This partially reverts commit 2a8085a.

I think it's okay to reenable the playground in dev only.

Additional context

I really want to replace all process.env.NODE_ENV === 'development' etc. with a constant like __DEV__ or __PROD__ but I also don't want to create conflicts for everyone everywhere just for aesthetics

Checklist

Are your changes backward compatible? Please answer below:

yes

On a scale of 1-10 how well and how have you QA'd this change and any features it might affect? Please answer below:

10. plugin is only added in dev and falsy values are filtered out since they would make Apollo throw

For frontend changes: Tested on mobile, light and dark mode? Please answer below:

n/a

Did you introduce any new environment variables? If so, call them out explicitly here:

no

Did you use AI for this? If so, how much did it assist you?

no

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Note

Enable Apollo GraphQL landing page (Explorer) in dev-only by conditionally adding ApolloServerPluginLandingPageLocalDefault and removing the disabled plugin.

• API/GraphQL (pages/api/graphql.js):
  • Add ApolloServerPluginLandingPageLocalDefault conditionally for process.env.NODE_ENV === 'development' with embedded dark-themed Explorer and persisted state.
  • Remove ApolloServerPluginLandingPageDisabled; filter falsy plugins with .filter(Boolean).

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