fix(tui): use pbcopy on macOS for clipboard copy#418
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Problem
Ctrl+C copy in TUI v2 silently fails on macOS Terminal.app.
Textual's built-in
copy_to_clipboarduses OSC 52 escape sequence which is not supported by macOS Terminal.app (acknowledged in Textual source comments).Fix
Override
copy_to_clipboardin the App class to usepbcopyon macOS, with fallback to the default OSC 52 for other platforms.Testing