supabase / supabase-swift / 21285692047

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fix: improve Swift concurrency thread safety and documentation (#891)

- Fix static variable race condition in AuthClient.globalClientID using LockIsolated
- Make ObservationToken properly thread-safe with single LockIsolated<MutableState>
- Add thread safety documentation to @unchecked Sendable classes:
  - PostgrestBuilder, PostgrestQueryBuilder, PostgrestFilterBuilder, PostgrestTransformBuilder
  - StorageApi, StorageBucketApi, SupabaseStorageClient, StorageFileApi
- Update ObservationTokenTests to use initializer-based onCancel pattern

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