fix: hide left input handles for all trigger node types

- Extend handle hiding logic to include TriggerWebhook, TriggerSchedule, TriggerPlugin
- Make trigger nodes behave like Start nodes without left-side input handles
- Apply fix to both main workflow and preview node handle components
- Ensures consistent UX where all start-type nodes have no input handles

web/app/components/workflow/nodes/_base/components/node-handle.tsx

@@ -84,7 +84,10 @@ export const NodeTargetHandle = memo(({
           data._runningStatus === NodeRunningStatus.Failed && 'after:bg-workflow-link-line-error-handle',
           data._runningStatus === NodeRunningStatus.Exception && 'after:bg-workflow-link-line-failure-handle',
           !connected && 'after:opacity-0',
-          data.type === BlockEnum.Start && 'opacity-0',
+          (data.type === BlockEnum.Start
+           || data.type === BlockEnum.TriggerWebhook
+           || data.type === BlockEnum.TriggerSchedule
+           || data.type === BlockEnum.TriggerPlugin) && 'opacity-0',
           handleClassName,
         )}
         isConnectable={isConnectable}

web/app/components/workflow/workflow-preview/components/node-handle.tsx

@@ -34,7 +34,10 @@ export const NodeTargetHandle = memo(({
           'after:absolute after:left-1.5 after:top-1 after:h-2 after:w-0.5 after:bg-workflow-link-line-handle',
           'transition-all hover:scale-125',
           !connected && 'after:opacity-0',
-          data.type === BlockEnum.Start && 'opacity-0',
+          (data.type === BlockEnum.Start
+           || data.type === BlockEnum.TriggerWebhook
+           || data.type === BlockEnum.TriggerSchedule
+           || data.type === BlockEnum.TriggerPlugin) && 'opacity-0',
           handleClassName,
         )}
       >