feat(frontend): confirm before stopping Xray and offer Start when it is stopped (#7104)

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

internal/web/translation/es-ES.json

@@ -151,6 +151,11 @@
       "xrayStatus": "Xray",
       "stopXray": "Detener",
       "restartXray": "Reiniciar",
+      "startXray": "Iniciar",
+      "stopXrayDisabledHint": "Xray no se está ejecutando",
+      "stopXrayConfirmTitle": "¿Detener Xray?",
+      "stopXrayConfirmContent": "Detener Xray interrumpirá de inmediato todas las conexiones proxy. ¿Seguro que quieres continuar?",
+      "stopXrayConfirmOk": "Detener Xray",
       "xraySwitch": "Versión",
       "xrayUpdates": "Actualizaciones de Xray",
       "xraySwitchClickDesk": "Elige sabiamente, ya que las versiones anteriores pueden no ser compatibles con las configuraciones actuales.",