## 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)
