Fix remaining tab indentation in graphql_helpers.rb

[Copilot]

Addressed final indentation inconsistency from code review feedback. Lines 81 and 84 in spec/support/helpers/graphql_helpers.rb still contained tabs while the surrounding code uses spaces.

Changes

• Replaced tabs with 2-space indentation on lines 81 and 84 in graphql_helpers.rb to match Ruby coding standards

def error_query
  %(
    errors {
      errorCode
      details {                                    # Fixed: was using tabs
        ...on ActiveModelError { attribute type }
        ...on MessageError { message }
      }                                            # Fixed: was using tabs
    }
  )
end

This completes all 7 code review suggestions from commit 300765b.

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