fix(tui): strip NUL characters before clipboard writes - #48337
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OpenTUI rejects clipboard text containing NUL before any destination, so shell output with embedded NULs made /copy fail entirely. Drop NULs at the shared TUI write boundary so the rest of the transcript can copy.
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Fixes #44198
OpenTUI rejects clipboard text containing NUL before any host or terminal write, so
/copyfails for sessions whose shell output includes NUL bytes. This drops NULs at the shared TUIwrite()boundary so the rest of the transcript can copy./exportis unchanged.This is the v2 equivalent of the OpenTUI clipboard-adapter approach in #44197. It does not use the old spawn/OSC 52 clipboard from #44230 (
dev).