Add muted state to Vue nodes (#5770)

## Summary

Added mute state support to Vue nodes with visual feedback and keyboard
shortcut functionality.

## Changes

- **What**: Implemented mute state (mode 2) for Vue nodes with opacity
styling and `Ctrl+M` hotkey support

## Review Focus

Visual consistency between bypass and mute states, and keyboard shortcut
conflict detection with existing hotkeys.

## Test Coverage

- Single node mute/unmute with `Ctrl+M` hotkey
- Multi-selection mute/unmute operations
- Visual state verification with opacity changes

## Related

- https://github.com/Comfy-Org/ComfyUI_frontend/pull/5715

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5770-Add-muted-state-to-Vue-nodes-2796d73d36508143b3edfbcb782de7c1)
by [Unito](https://www.unito.io)

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -21,6 +21,8 @@
           'animate-pulse': executing,
           'opacity-50 before:rounded-2xl before:pointer-events-none before:absolute before:bg-bypass/60 before:inset-0':
             bypassed,
+          'opacity-50 before:rounded-2xl before:pointer-events-none before:absolute before:inset-0':
+            muted,
           'will-change-transform': isDragging
         },
 
@@ -213,6 +215,7 @@ const hasAnyError = computed((): boolean => {
 })
 
 const bypassed = computed((): boolean => nodeData.mode === 4)
+const muted = computed((): boolean => nodeData.mode === 2) // NEVER mode
 
 // Use canvas interactions for proper wheel event handling and pointer event capture control
 const { handleWheel, shouldHandleNodePointerEvents } = useCanvasInteractions()