opentui(copy): mask chrome/gutters so free-form copy is clean
Audit selectable masking (free-code noSelect model) so a free-form drag over an
agent turn yields CLEAN pasteable content — no labels, summaries, carets, or
annotations. Newly masked (selectable={false}):
- toolPart: the whole collapsed header row (name + args-preview + duration +
"(N lines)") summary; the "args"/"output" section labels; the args overflow
"… +N more"; the "… omitted N" / "… +N more lines" truncation notes.
- messageLine: the streaming caret (▍) — a cursor glyph, not content.
- reasoningPart: the collapsible-section header label (Thinking/Thought + title).
- composer: the completion dropdown rows + the "Tab complete · Esc dismiss" hint.
Kept selectable (real content): assistant markdown, tool args values + output
body, user/system message text.
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