import CodexBarCoreimport Foundation extension UsageStore {    func tokenSnapshot(for provider: UsageProvider) -> CostUsageTokenSnapshot? {        self.tokenSnapshots[provider]    }     func tokenError(for provider: UsageProvider) -> String? {        self.tokenErrors[provider]    }     func tokenLastAttemptAt(for provider: UsageProvider) -> Date? {        self.lastTokenFetchAt[provider]    }     func isTokenRefreshInFlight(for provider: UsageProvider) -> Bool {        self.tokenRefreshInFlight.contains(provider)    }     nonisolated static func costUsageCacheDirectory(        fileManager: FileManager = .default) -> URL    {        let root = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first!        return root            .appendingPathComponent("CodexBar", isDirectory: true)            .appendingPathComponent("cost-usage", isDirectory: true)    }     nonisolated static func tokenCostNoDataMessage(for provider: UsageProvider) -> String {        ProviderDescriptorRegistry.descriptor(for: provider).tokenCost.noDataMessage()    }}