fix Vue node widgets should be in disabled state if their slots are connected with a link (#5834)

## Summary

Fixes https://github.com/Comfy-Org/ComfyUI_frontend/issues/5692 by
making widget link connection status trigger on change so Vue widgets
with connected links could properly switch to the `disabled` state when
they are implicitly converted to inputs.

## Changes

- **What**: Added `node:slot-links:changed` event tracking and reactive
slot data synchronization for Vue widgets

```mermaid
graph TD
    A[Widget Link Change] --> B[NodeInputSlot.link setter]
    B --> C{Is Widget Input?}
    C -->|Yes| D[Trigger slot-links:changed]
    C -->|No| E[End]
    D --> F[Graph Event Handler]
    F --> G[syncNodeSlotData]
    G --> H[Update Vue Reactive Data]
    H --> I[Widget Re-render]
    
    style A fill:#f9f9f9,stroke:#333,color:#000
    style I fill:#f9f9f9,stroke:#333,color:#000
```

## Review Focus

Widget reactivity performance with frequent link changes and event
handler memory management in graph operations.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5834-fix-Vue-node-widgets-should-be-in-disabled-state-if-their-slots-are-connected-with-a-link-27c6d73d365081f6a6c3c1ddc3905c5e)
by [Unito](https://www.unito.io)

src/renderer/core/layout/sync/useSlotLayoutSync.ts

@@ -95,19 +95,19 @@ export function useSlotLayoutSync() {
       }
     }
 
-    graph.onTrigger = (action: string, param: any) => {
+    graph.onTrigger = (event) => {
       if (
-        action === 'node:property:changed' &&
-        param?.property === 'flags.collapsed'
+        event.type === 'node:property:changed' &&
+        event.property === 'flags.collapsed'
       ) {
-        const node = graph.getNodeById(parseInt(String(param.nodeId)))
+        const node = graph.getNodeById(parseInt(String(event.nodeId)))
         if (node) {
           computeAndRegisterSlots(node)
         }
       }
-      if (origTrigger) {
-        origTrigger.call(graph, action, param)
-      }
+
+      // Chain to original handler
+      origTrigger?.(event)
     }
 
     graph.onAfterChange = (graph: any, node?: any) => {