No hot reloading when change font scale

Description

In old arch, we can change font scale in realtime with command option +/-.
In new arch, it has to be refreshed manually with pressing R to get new font scale applied.

Steps to reproduce

1. gh repo clone yzhe554/new-arch-font-scale
2. cd new-arch-font-scale
3. npm i
4. npm run ios
5. change font scale with option command +/-

React Native Version

0.74.3

Affected Platforms

Runtime - iOS

Areas

Fabric - The New Renderer

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (10) arm64 Apple M1 Max
  Memory: 107.00 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.18.0
    path: ~/.nvm/versions/node/v18.18.0/bin/node
  Yarn:
    version: 1.22.18
    path: /usr/local/bin/yarn
  npm:
    version: 9.8.1
    path: ~/.nvm/versions/node/v18.18.0/bin/npm
  Watchman:
    version: 2024.05.06.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.5
      - iOS 17.5
      - macOS 14.5
      - tvOS 17.5
      - visionOS 1.2
      - watchOS 10.5
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.2 AI-232.10300.40.2321.11567975
  Xcode:
    version: 15.4/15F31d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.9
    path: /usr/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/yuzheng/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.74.3
    wanted: 0.74.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

N/A

Reproducer

https://github.com/yzhe554/new-arch-font-scale

Screenshots and Videos

In Old Arch

https://github.com/user-attachments/assets/b1e2d7a7-1070-4d3d-ac2c-a7e75952ef03

In New Arch

https://github.com/user-attachments/assets/e7ef203c-c355-4674-80de-e508c046e61f

https://github.com/yzhe554/new-arch-font-scale のリンク先の reproducer から始め、依存関係をインストールして npm run ios で実行します。古いアーキテクチャと新しいアーキテクチャでフォントスケールの変更を比較します。完了の条件は、新しいアーキテクチャで R を押さなくても変更が直ちに適用されることです。