refactor(subscription): optimize subscription count handling in list view

- Replaced direct length checks on subscriptions with a computed subscriptionCount variable for improved readability and performance.
- Updated the CreateSubscriptionButton to conditionally render based on the new subscriptionCount variable, enhancing clarity in the component logic.
- Adjusted className logic for the button to account for multiple supported methods, ensuring better user experience.

web/app/components/plugins/plugin-detail-panel/subscription-list/create/index.tsx

@@ -146,7 +146,7 @@ export const CreateSubscriptionButton = ({ buttonType = CreateButtonType.FULL_BU
         triggerPopupSameWidth: buttonType === CreateButtonType.FULL_BUTTON,
       }}
       triggerProps={{
-        className: cn('h-8 bg-transparent px-0 hover:bg-transparent', methodType !== DEFAULT_METHOD && 'pointer-events-none', buttonType === CreateButtonType.FULL_BUTTON && 'grow'),
+        className: cn('h-8 bg-transparent px-0 hover:bg-transparent', methodType !== DEFAULT_METHOD && supportedMethods.length > 1 && 'pointer-events-none', buttonType === CreateButtonType.FULL_BUTTON && 'grow'),
       }}
       popupProps={{
         wrapperClassName: 'z-[1000]',

web/app/components/plugins/plugin-detail-panel/subscription-list/list-view.tsx

@@ -29,24 +29,25 @@ export const SubscriptionListView: React.FC<SubscriptionListViewProps> = ({
       </div>
     )
   }
+  const subscriptionCount = subscriptions?.length || 0
 
   return (
     <div className={cn('border-divider-subtle px-4 py-2', showTopBorder && 'border-t')}>
       <div className='relative mb-3 flex items-center justify-between'>
-        {subscriptions?.length && (
+        {subscriptionCount > 0 && (
           <div className='flex shrink-0 items-center gap-1'>
             <span className='system-sm-semibold-uppercase text-text-secondary'>
-              {t('pluginTrigger.subscription.listNum', { num: subscriptions?.length || 0 })}
+              {t('pluginTrigger.subscription.listNum', { num: subscriptionCount })}
             </span>
             <Tooltip popupContent={t('pluginTrigger.subscription.list.tip')} />
           </div>
         )}
         <CreateSubscriptionButton
-          buttonType={subscriptions?.length ? CreateButtonType.ICON_BUTTON : CreateButtonType.FULL_BUTTON}
+          buttonType={subscriptionCount > 0 ? CreateButtonType.ICON_BUTTON : CreateButtonType.FULL_BUTTON}
         />
       </div>
 
-      {subscriptions?.length && (
+      {subscriptionCount > 0 && (
         <div className='flex flex-col gap-1'>
           {subscriptions?.map(subscription => (
             <SubscriptionCard