[Producer] Upstream Bug – Windows multi-line paste truncates and auto-submits #55
Description
Context
Mirrors upstream bug: openai#2137
On Windows, pasting multi-line text in Codex CLI only keeps the first line and auto-submits.
Acceptance Criteria
- Multi-line paste preserves line breaks and does not auto-submit
- CRLF line ending handling is correct
- Add TUI/input handling tests; update snapshot tests where applicable (codex-rs/tui)
- Manual verification on Windows Terminal and PowerShell
Refs: #6, upstream: openai#2137