fix(terminal): suppress competing context menus

Stop contextmenu propagation after recognizing selected xterm output so the native browser overlay cannot block Copy.

apps/web/src/components/features/terminal/terminal.tsx

@@ -498,6 +498,8 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 				}
 
 				event.preventDefault();
+				event.stopImmediatePropagation();
+				event.stopPropagation();
 				setCopyMenu({ x: event.clientX, y: event.clientY, text: selection });
 			};