allow Vue nodes to be resized from all 4 corners (#6187)

## Summary

Enables Vue nodes to resize from all four corners and consolidated the
interaction pipeline.

## Changes

- **What**: Added four-corner handles to `LGraphNode`, wired them
through the refactored `useNodeResize` composable, and centralized the
math/preset helpers under `interactions/resize/` with cleaner pure
functions and lint-compliant markup.

## Review Focus

Corner-to-corner resizing accuracy (position + size), pinned-node guard
preventing resize start, and snap-to-grid behavior at varied zoom
levels.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6187-allow-Vue-nodes-to-be-resized-from-all-4-corners-2936d73d365081c8bf14e944ab24c27f)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

tests-ui/tests/renderer/extensions/vueNodes/components/LGraphNode.test.ts

@@ -51,9 +51,11 @@ vi.mock('@/renderer/extensions/vueNodes/layout/useNodeLayout', () => ({
   useNodeLayout: () => ({
     position: { x: 100, y: 50 },
     size: { width: 200, height: 100 },
+    zIndex: 0,
     startDrag: vi.fn(),
     handleDrag: vi.fn(),
-    endDrag: vi.fn()
+    endDrag: vi.fn(),
+    moveTo: vi.fn()
   })
 }))
 
@@ -77,7 +79,7 @@ vi.mock('@/renderer/extensions/vueNodes/preview/useNodePreviewState', () => ({
   }))
 }))
 
-vi.mock('../composables/useNodeResize', () => ({
+vi.mock('../interactions/resize/useNodeResize', () => ({
   useNodeResize: vi.fn(() => ({
     startResize: vi.fn(),
     isResizing: computed(() => false)