Wire copy-on-select in XtermSession (shared by the workspace terminal
and the /machine terminal): a header checkbox toggles the behavior and
persists to localStorage under spoon.terminal.copyOnSelect. On mount the
stored value takes precedence over the copyOnSelect prop default. When
enabled, onSelectionChange copies the current selection via
navigator.clipboard.writeText — guarded (empty selections skipped;
clipboard-unavailable/denied errors swallowed). The handler reads the
toggle through a ref so live flips apply without reconnecting.
WebLinksAddon remains loaded so printed URLs are clickable.
Manual verification: in /machine and a workspace terminal, enabling
copy-on-select and selecting text places it on the clipboard; a printed
URL is clickable and opens in a new tab.
Gabriel Brown