iOS: ellipsizeMode="clip" renders RTL (Arabic) text as a mangled fragment at the line start

Description

With numberOfLines={1} and ellipsizeMode="clip", a one-line RTL (Arabic) string that overflows its container renders as a jumbled fragment collapsed at the visual start (right edge) on iOS, instead of drawing the line normally and clipping the overflow at the container edge. ellipsizeMode="tail" on the same string truncates without mangling (subject to #58315). LTR text clips correctly.

Observed with multiple Arabic fonts (Scheherazade New, KFGQPC Hafs) in the same reproducer as #58315: select the "clip" mode — every overflowing row shows the mangled fragment; screenshots in the repo README.

Steps to reproduce

1. Clone https://github.com/muhasabahhub/rn-arabic-seat, npm install, npx expo start, Expo Go on a physical iPhone.
2. Select: clip + any Arabic font (Scheherazade or Hafs). Mutations all off.
3. Overflowing rows (the second of each pair) render as a jumbled cluster at the right edge instead of a clean clipped line.
4. Switch to tail: same strings truncate without mangling.

React Native Version

0.86.3

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

Expo SDK 57 managed project — envinfo equivalent below; full dependency table in the repo README.

 System:
    OS: Windows 11 10.0.26200
    CPU: (22) x64 Intel(R) Core(TM) Ultra 7 155H
    Memory: 3.80 GB / 15.59 GB
  Binaries:
    Node: 24.13.1 - C:\Program Files\nodejs\node.EXE
    npm: 11.19.0 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    expo: ~57.0.18 => 57.0.19
    expo-font: ~57.0.2 => 57.0.3
    react: 19.2.3 => 19.2.3
    react-native: 0.86.3 => 0.86.3
    react-native-safe-area-context: ~5.7.0 => 5.7.0


Device: iPhone 15, iOS 23.3.1, physical device via Expo Go. New Architecture (Fabric), Hermes.

Stacktrace or Logs

No crash or error output — this is a silent rendering defect. Nothing is logged.

MANDATORY Reproducer

https://github.com/muhasabahhub/rn-arabic-seat

Screenshots and Videos

github.com/muhasabahhub/rn-arabic-seat にある必須の reproducer から始め、オーバーフローするアラビア語の行を使用して、ellipsizeMode="clip" と "tail" の iOS レンダリングを比較します。reproducer から React Native iOS のテキストレンダリングパスを追跡します。オーバーフローする 1 行の RTL テキストが、崩れた断片を残さずコンテナの端で正しくクリップされ、LTR の動作が正しいままであれば完了です。