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Closes #211. Copying from the terminal only worked through the browser context menu, because xterm turns Ctrl+C into 0x03 and cancels the keydown, so the muscle-memory copy failed silently and read as "no copy-paste at all". With a selection, Ctrl+C now copies it, toasts, clears the selection and sends nothing to the PTY. With no selection it falls through unchanged, so the interrupt is intact. Ctrl+Shift+C is an explicit copy chord that never falls through: an explicit copy that interrupts a running agent because the selection happened to be empty would be a footgun. Three details that keep the interrupt safe: - The decision lives in attachCustomKeyEventHandler (terminal-ui.js) and the no-selection path returns true WITHOUT preventDefault. xterm calls the custom handler before its own cancel(), so returning false alone does not cancel the event; the copy path therefore calls preventDefault explicitly, or the browser would run its native copy on top of ours. - copy-selection is a full registry entry (rebindable and disableable in App Settings) whose action is deliberately absent from SHORTCUT_ACTIONS, the same trick command-palette uses: the generic capture loop preventDefaults every match it dispatches, which would cost the user the interrupt key. - The gate is keydown-only, since the custom handler also runs for keypress and keyup. Copy goes through _copyText (Clipboard API, then hidden-textarea + execCommand) rather than raw navigator.clipboard, because install.sh's LAN option serves plain HTTP where navigator.clipboard is undefined; the fallback steals focus, so the terminal is refocused afterwards. Tests: test/terminal-copy-selection.test.ts pins the gate and the SHORTCUT_ACTIONS invariant; test/terminal-copy-shortcut.test.ts drives real key presses in chromium and asserts on the clipboard plus the bytes xterm emitted (browser-driven, so excluded from test:ci like the other Playwright suites). Verified manually on an isolated beta instance before landing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>