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Fixes #20587, reported by @noeljackson. This prevents the TUI wrapping code from panicking when `textwrap` returns a borrowed slice that does not point into the original source text. The fix follows the direction proposed by @misrtjakub in the issue comment: validate the borrowed slice pointer range first, and fall back to the existing owned-line mapper when the slice is external. - Guards borrowed wrapped slices before converting pointer offsets into byte ranges. - Reuses the existing owned-line range recovery path for external borrowed slices. - Adds coverage for rejecting borrowed slices outside the source text. End-user testing steps: - Start Codex in TUI mode under a PTY wrapper that can inject stdin after startup. - Inject `\x1b[200~test message\x1b[201~\r` after the TUI is ready. - Confirm Codex does not panic and the pasted text is handled normally. Local validation: - `cargo test -p codex-tui wrapping::tests::` - `cargo test -p codex-tui -- --skip status::tests::status_permissions_full_disk_managed_with_network_is_danger_full_access --skip status::tests::status_permissions_full_disk_managed_without_network_is_external_sandbox`