fix: increase active node border weight from 2 to 3 (#8654)

## Summary

Increase stroke/outline weight for active node states to improve
visibility during workflow execution (COM-7770).

## Changes

- **What**: Increased border/stroke weight from 2 to 3 for active nodes
in both Vue Nodes and LiteGraph renderers
  - Vue Nodes: `outline-2` → `outline-3` in `LGraphNode.vue`
- LiteGraph: `lineWidth: 3` for `running` stroke (was default 1) and
`executionError` stroke (was 2) in `litegraphService.ts`
  - Updated test assertion to match

## Review Focus

Minimal visual change. The `executionError` lineWidth was also bumped
from 2 → 3 so error states remain at least as prominent as running
states.

> **Note:**
[#8603](https://github.com/Comfy-Org/ComfyUI_frontend/pull/8603) (by
@AustinMroz) also modifies `LGraphNode.vue` with a larger restructuring
(bottom buttons, badges, resize handle). The two PRs do not conflict —
#8603 does not touch the outline/border state classes or
`litegraphService.ts`, so both changes merge cleanly.

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: github-actions <github-actions@github.com>

src/renderer/extensions/vueNodes/components/LGraphNode.test.ts

@@ -184,7 +184,7 @@ describe('LGraphNode', () => {
 
     const wrapper = mountLGraphNode({ nodeData: mockNodeData })
 
-    expect(wrapper.classes()).toContain('outline-2')
+    expect(wrapper.classes()).toContain('outline-3')
     expect(wrapper.classes()).toContain('outline-node-component-outline')
   })
 

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

@@ -17,7 +17,7 @@
         // hover (only when node should handle events)
         shouldHandleNodePointerEvents &&
           'hover:ring-7 ring-node-component-ring',
-        'outline-transparent outline-2 focus-visible:outline-node-component-outline',
+        'outline-transparent outline-3 focus-visible:outline-node-component-outline',
         borderClass,
         outlineClass,
         cursorClass,