[Bug] Long assistant messages truncated in transcript scrollback

Bug Description
▎ Title: Long assistant messages get truncated/cut off when scrolling up in transcript ▎ ▎ Description: In a long session, scrolling up to re-read a previous long assistant message shows it cut off — the full message isn't rendered/retrievable in the scrollback. Had ▎ to ask the assistant to re-echo the message verbatim to read it in full. ▎ ▎ Environment: Claude Code, background session, macOS (Darwin 23.6.0), model claude-opus-4-8. ▎ ▎ Expected: Full message text remains scrollable/readable in the transcript. ▎ Actual: Message appears truncated when scrolled back to.

Environment Info

• Platform: darwin
• Terminal: xterm-256color
• Version: 2.1.205
• Feedback ID: 8f9361b5-0ba9-4562-a0a8-339a2ffa7a29

Errors

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