The file /Users/neog/Apps/macOS/GhostWriter/GhostWriter/Services/Security/KeychainService.swift has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→import Foundation
     2→import Security
     3→
     4→enum KeychainService {
     5→    private static let service = AppConstants.App.bundleId
     6→
     7→    enum Key: String, CaseIterable {
     8→        case claudeAPIKey = "claude_api_key"
     9→    }
    10→
    11→    // MARK: - Save
    12→
    13→    @discardableResult
    14→    static func save(_ value: String, for key: Key) -> Bool {
    15→        guard let data = value.data(using: .utf8) else { return false }
    16→
    17→        // Delete existing item first
    18→        delete(key)
    19→
    20→        let query: [String: Any] = [
    21→            kSecClass as String: kSecClassGenericPassword,
    22→            kSecAttrService as String: service,
    23→            kSecAttrAccount as String: key.rawValue,
    24→            kSecValueData as String: data,
    25→            kSecAttrAccessible as String: kSecAttrAccessibleWhenUnlockedThisDeviceOnly
    26→        ]
    27→
    28→        let status = SecItemAdd(query as CFDictionary, nil)
    29→        return status == errSecSuccess
    30→    }
    31→
    32→    // MARK: - Get
    33→
    34→    static func get(_ key: Key) -> String? {
    35→        let query: [String: Any] = [
    36→            kSecClass as String: kSecClassGenericPassword,
    37→            kSecAttrService as String: service,
    38→            kSecAttrAccount as String: key.rawValue,
    39→            kSecReturnData as String: true,
    40→            kSecMatchLimit as String: kSecMatchLimitOne
    41→        ]
    42→
    43→        var result: AnyObject?
    44→        let status = SecItemCopyMatching(query as CFDictionary, &result)
    45→
    46→        guard status == errSecSuccess,
    47→              let data = result as? Data,
    48→              let value = String(data: data, encoding: .utf8) else {
    49→            return nil
    50→        }
    51→
    52→        return value
    53→    }
    54→
    55→    // MARK: - Delete
    56→
    57→    @discardableResult
    58→    static func delete(_ key: Key) -> Bool {
    59→        let query: [String: Any] = [
    60→            kSecClass as String: kSecClassGenericPassword,
    61→            kSecAttrService as String: service,
    62→            kSecAttrAccount as String: key.rawValue
    63→        ]
    64→
    65→        let status = SecItemDelete(query as CFDictionary)
    66→        return status == errSecSuccess || status == errSecItemNotFound
    67→    }
    68→
    69→    // MARK: - Helpers
    70→
    71→    static func exists(_ key: Key) -> Bool {
    72→        get(key) != nil && !get(key)!.isEmpty
    73→    }
    74→
    75→    static func deleteAll() {
    76→        Key.allCases.forEach { delete($0) }
    77→    }
    78→
    79→    // MARK: - Convenience
    80→
    81→    static var hasClaudeAPIKey: Bool {
    82→        exists(.claudeAPIKey)
    83→    }
    84→
    85→    static var claudeAPIKey: String? {
    86→        get { get(.claudeAPIKey) }
    87→        set {
    88→            if let value = newValue {
    89→                save(value, for: .claudeAPIKey)
    90→            } else {
    91→                delete(.claudeAPIKey)
    92→            }
    93→        }
    94→    }
    95→}
    96→