[BUG] Arabic text renders with reversed and disconnected letters in CLI

Bug Description

Arabic text output in Claude Code CLI is broken. Arabic characters are displayed reversed (left-to-right instead of right-to-left) and rendered as disconnected/isolated letter forms instead of properly joined cursive forms.

Arabic is a cursive script where letters change shape based on their position in a word (initial, medial, final, isolated). Claude Code CLI is rendering each letter in its isolated form, making the output unreadable.

Expected Behavior

Arabic text should render:

• Right-to-left (RTL) direction
• With connected/joined letter forms (cursive shaping)
• Readable and properly formatted, as it appears in any standard terminal or text editor

Actual Behavior

• Letters appear in reversed order (LTR instead of RTL)
• Letters are detached/isolated — each character renders in its standalone form instead of joining with adjacent letters
• Output is completely unreadable to Arabic speakers

Example

Expected output:
مرحبا بالعالم (connected, right-to-left)

Actual output (approximation):
م ر ح ب ا ب ا ل ع ا ل م (disconnected, reversed)

Environment

• Claude Code version: Latest (installed via npm install -g @anthropic-ai/claude-code)
• OS: macOS (also likely affects Linux)
• Terminal: Tested in macOS Terminal.app and iTerm2
• Shell: zsh
• Locale: Terminal supports UTF-8 and renders Arabic correctly in all other CLI tools

Steps to Reproduce

1. Install Claude Code CLI
2. Ask Claude any question in Arabic, or ask it to respond in Arabic
3. Observe the output — letters are reversed and disconnected

Additional Context

• The terminal itself handles Arabic/RTL text correctly (e.g., echo "مرحبا" renders properly)
• This suggests the issue is in Claude Code's text rendering layer, not the terminal
• Related to #16814 (RTL support request for Desktop) but this is a CLI-specific bug affecting basic text legibility
• Similar Unicode rendering issue reported in #26564 (UTF-8 mangling with /copy)

Impact

This makes Claude Code completely unusable for Arabic-speaking users or any workflow involving Arabic text output.