fix: accurate bounding rect for Vue nodes with footer

- Measure body (node-inner-wrapper) for node.size to exclude footer
  height, preventing size accumulation on Vue/legacy mode switching
- Store footer height separately (_footerHeight) for boundingRect
- Store collapsed width/height from DOM in ResizeObserver instead of
  relying on canvas text measurement
- Skip _collapsed_width text measurement in Vue nodes mode since
  measure() ctx overwrites ResizeObserver values
- Restore selectionBorder.ts to use createBounds (no per-frame DOM)

browser_tests/fixtures/helpers/NodeOperationsHelper.ts

@@ -4,7 +4,10 @@ import type {
   LGraph,
   LGraphNode
 } from '../../../src/lib/litegraph/src/litegraph'
-import type { NodeId } from '../../../src/platform/workflow/validation/schemas/workflowSchema'
+import type {
+  ComfyWorkflowJSON,
+  NodeId
+} from '../../../src/platform/workflow/validation/schemas/workflowSchema'
 import type { ComfyPage } from '../ComfyPage'
 import { DefaultGraphPositions } from '../constants/defaultGraphPositions'
 import type { Position, Size } from '../types'
@@ -111,6 +114,27 @@ export class NodeOperationsHelper {
     }
   }
 
+  async loadWithPositions(
+    positions: Record<string, [number, number]>
+  ): Promise<void> {
+    await this.page.evaluate(
+      async ({ positions }) => {
+        const data = window.app!.graph.serialize()
+        for (const node of data.nodes) {
+          const pos = positions[String(node.id)]
+          if (pos) node.pos = pos
+        }
+        await window.app!.loadGraphData(
+          data as ComfyWorkflowJSON,
+          true,
+          true,
+          null
+        )
+      },
+      { positions }
+    )
+  }
+
   async resizeNode(
     nodePos: Position,
     nodeSize: Size,