fix: 3d resize vertically (#7621)

## Summary

Fix an issue #7620 where 3D nodes could be resized vertically only in
the expanding direction but could not be shrunk.


## Changes
- **What**:  
- Allow the 3D node content container to shrink by removing `h-full` and
adding `min-h-0 flex-1`.
- Prevent the internal canvas from reasserting its previous height
during parent resize by avoiding `h-full` and constraining it with
`max-h-full`.
- **Dependencies**:  
  - None

## Review Focus

- Verify that vertical resize works in both directions for 3D nodes.
- Ensure the canvas still resizes correctly with the node and that
three.js rendering is unaffected.
- Confirm no regression in pointer events, overlays, or resize handles.

## Screenshots 
before


https://github.com/user-attachments/assets/6b9e3bb0-98eb-4b06-adb3-b3aab60a7f86


after


https://github.com/user-attachments/assets/76d1a962-6cdc-4ca4-941e-7a3874629b29

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7621-fix-3d-resize-vertically-2cd6d73d365081efb281e8a40c87bf9e)
by [Unito](https://www.unito.io)

Author: kaili-yang

src/extensions/core/load3d/Load3d.ts

@@ -72,7 +72,13 @@ class Load3d {
     this.renderer.setClearColor(0x282828)
     this.renderer.autoClear = false
     this.renderer.outputColorSpace = THREE.SRGBColorSpace
-    this.renderer.domElement.classList.add('flex', '!h-full', '!w-full')
+    this.renderer.domElement.classList.add(
+      'absolute',
+      'inset-0',
+      'h-full',
+      'w-full',
+      'outline-none'
+    )
     container.appendChild(this.renderer.domElement)
 
     this.eventManager = new EventManager()
@@ -609,7 +615,7 @@ class Load3d {
   }
 
   handleResize(): void {
-    const parentElement = this.renderer?.domElement
+    const parentElement = this.renderer?.domElement?.parentElement
 
     if (!parentElement) {
       console.warn('Parent element not found')