Perf: Add final to classes that are not inherited (#574)

bitchat/Services/AutocompleteService.swift

@@ -9,7 +9,7 @@
 import Foundation
 
 /// Manages autocomplete functionality for chat
-class AutocompleteService {
+final class AutocompleteService {
     private let mentionRegex = try? NSRegularExpression(pattern: "@([\\p{L}0-9_]*)$", options: [])
     private let commandRegex = try? NSRegularExpression(pattern: "^/([a-z]*)$", options: [])
     

bitchat/Services/CommandProcessor.swift

@@ -17,7 +17,7 @@ enum CommandResult {
 
 /// Processes chat commands in a focused, efficient way
 @MainActor
-class CommandProcessor {
+final class CommandProcessor {
     weak var chatViewModel: ChatViewModel?
     weak var meshService: Transport?
     

bitchat/Services/FavoritesPersistenceService.swift

@@ -3,7 +3,7 @@ import Combine
 
 /// Manages persistent favorite relationships between peers
 @MainActor
-class FavoritesPersistenceService: ObservableObject {
+final class FavoritesPersistenceService: ObservableObject {
     
     struct FavoriteRelationship: Codable {
         let peerNoisePublicKey: Data

bitchat/Services/KeychainManager.swift

@@ -10,7 +10,7 @@ import Foundation
 import Security
 import os.log
 
-class KeychainManager {
+final class KeychainManager {
     static let shared = KeychainManager()
     
     // Use consistent service name for all keychain items

bitchat/Services/NoiseEncryptionService.swift

@@ -135,7 +135,7 @@ enum EncryptionStatus: Equatable {
 /// Provides a high-level API for establishing secure channels between peers,
 /// handling all cryptographic operations transparently.
 /// - Important: This service maintains the device's cryptographic identity
-class NoiseEncryptionService {
+final class NoiseEncryptionService {
     // Static identity key (persistent across sessions)
     private let staticIdentityKey: Curve25519.KeyAgreement.PrivateKey
     public let staticIdentityPublicKey: Curve25519.KeyAgreement.PublicKey

bitchat/Services/NotificationService.swift

@@ -14,7 +14,7 @@ import UIKit
 import AppKit
 #endif
 
-class NotificationService {
+final class NotificationService {
     static let shared = NotificationService()
     
     private init() {}

bitchat/Services/PrivateChatManager.swift

@@ -10,7 +10,7 @@ import Foundation
 import SwiftUI
 
 /// Manages all private chat functionality
-class PrivateChatManager: ObservableObject {
+final class PrivateChatManager: ObservableObject {
     @Published var privateChats: [String: [BitchatMessage]] = [:]
     @Published var selectedPeer: String? = nil
     @Published var unreadMessages: Set<String> = []

bitchat/Services/UnifiedPeerService.swift

@@ -13,7 +13,7 @@ import CryptoKit
 
 /// Single source of truth for peer state, combining mesh connectivity and favorites
 @MainActor
-class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
+final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
     
     // MARK: - Published Properties