Stop sat next to Restart on the dashboard and fired on the first click. A
mis-click cut every proxy connection, and when the panel itself is reached
through that proxy the only way back was SSH (#7103).
Stop now opens a confirmation with Cancel focused. When Xray is stopped the
first button reads Start instead of Restart and Stop is disabled; in the
crashed state Stop stays enabled, because setting the manual-stop flag is
what halts the crash-recovery restart loop.
Closes#7103
Nikan Zeyaei