feat: enable/disable dashboard features

[alaister]

This PR adds client side (non-API-driven) support for disabling dashboard features. It extends the existing useIsFeatureEnabled() hook.

API Design

• Allow for control from either or both the API side + Frontend side.
• Fully type-safe with proper descriptions to allow for an easy UX. e.g.:
  
• Minimal new patterns required.

How to add support for enabling/disabling a new feature in the dashboard:

1. Add a name and description to enabled-features.schema.json

   The naming convention should be group:feature. This PR includes the examples: profile:show_email and profile:update. These names can conflict with existing feature names returned by the API. This is so we can have API or Frontend control over a feature.

2. Add the default state (true/false for on/off) in enabled-features.json. Generally we should be defaulting to true for hosted studio.

3. Implement useIsFeatureEnabled() to conditionally check if a feature is enabled.
   For a single check:

   const profileShowEmailEnabled = useIsFeatureEnabled('profile:show_email')

   For checking multiple features at a time:

   const { profileShowEmail: profileShowEmailEnabled, profileUpdate: profileUpdateEnabled } =
     useIsFeatureEnabled(['profile:show_email', 'profile:update'])

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
design-system	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am
docs	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am
studio-self-hosted	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am
studio-staging	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am
ui-library	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am
zone-www-dot-com	✅ Ready	Preview	Comment	Aug 15, 2025 5:29am

2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
cms	⬜️ Ignored			Aug 15, 2025 5:29am
studio	⬜️ Ignored			Aug 15, 2025 5:29am

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[charislam]

Tested locally toggling profile:email off and worked as expected!

[coveralls]

coverage: 71.197%. remained the same
when pulling 292eff0 on feat/enabled-disable-features
into 41bfd35 on master.