Fix multiline paste in AI terminal panels

[parsakhaz]

Summary

• protect multiline text paste in AI CLI terminal panels by converting pasted line breaks to Pane's existing Alt/Shift+Enter newline sequence
• keep single-line text paste, image paste, drag/drop, and TUI paste behavior on the existing xterm path

Testing

• pnpm typecheck
• pnpm lint (passes with existing warnings)
• pnpm build (frontend and main build pass; build:electron fails in this WSL environment while rebuilding msgpackr-extract because g++ rejects -m64)

Notes

• The change is intentionally scoped to CLI panels when no alternate-screen TUI is active.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: bf4ac4b1d1

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[parsakhaz]

@codex review

[parsakhaz]

@claude review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".