fix(common): restore narrow Feature type (#50850)

The platform API now types `ProfileResponse.disabled_features` as
`string[]` (since #48981), which collapsed the `Feature` union to plain
`string`, so `isFeatureEnabled` accepted any string and typos went
uncaught.

**Changed:**
- `Feature` is now a local `RuntimeFeature` union (the profile-driven
flags) plus the keys of `enabled-features.json`, instead of deriving
from the API type
- `useIsFeatureEnabled` casts the merged runtime disabled list to
`Feature[]`, since the profile field is now `string[]`

The runtime feature list duplicates what the backend knows. Once the
enum is restored in the API spec, `Feature` can go back to deriving from
the generated type.

## To test

- `pnpm typecheck` passes
- Passing a bogus string to `useIsFeatureEnabled` / `isFeatureEnabled`
is now a type error
- Nothing behavioral changes, so a quick sanity check that the sidebar /
billing / org settings still render is enough


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **No user-facing changes**
* This update does not change the app’s visible features or behavior. It
includes internal typing adjustments only.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Alaister Young <10985857+alaister@users.noreply.github.com>

packages/common/enabled-features/index.ts

@@ -1,14 +1,27 @@
-import type { components } from 'api-types'
-
 import enabledFeaturesRaw from './enabled-features.json' with { type: 'json' }
 
 const enabledFeaturesStaticObj = enabledFeaturesRaw as Omit<typeof enabledFeaturesRaw, '$schema'>
 
-type Profile = components['schemas']['ProfileResponse_Output']
+// Features the platform can disable per-user via the profile's `disabled_features`.
+// The API types this as `string[]`, so the known values are listed here to keep `Feature` narrow.
+type RuntimeFeature =
+  | 'organizations:create'
+  | 'organizations:delete'
+  | 'organization_members:create'
+  | 'organization_members:delete'
+  | 'projects:create'
+  | 'projects:transfer'
+  | 'project_auth:all'
+  | 'project_storage:all'
+  | 'project_edge_function:all'
+  | 'profile:update'
+  | 'billing:account_data'
+  | 'billing:credits'
+  | 'billing:invoices'
+  | 'billing:payment_methods'
+  | 'realtime:all'
 
-export type Feature =
-  | NonNullable<Profile['disabled_features']>[number]
-  | keyof typeof enabledFeaturesStaticObj
+export type Feature = RuntimeFeature | keyof typeof enabledFeaturesStaticObj
 
 const disabledFeaturesStaticArray = Object.entries(enabledFeaturesStaticObj)
   .filter(([_, value]) => !value)