fixup! front: update stdcm simulation progress button design

Author: SharglutDev

front/src/applications/stdcm/components/StdcmForm/StdcmConfig.tsx

@@ -197,10 +197,11 @@ const StdcmConfig = ({
                 <Button
                   data-testid="launch-simulation-button"
                   className={cx({
-                    'fade-out': !showBtnToLaunchSimulation,
+                    'fade-out': isPending || !showBtnToLaunchSimulation,
                   })}
                   label={t('simulation.getSimulation')}
                   onClick={startSimulation}
+                  isDisabled={disabled || !showBtnToLaunchSimulation}
                 />
                 {formErrors && (
                   <StdcmWarningBox