fix 3d-min-resize (#7815)

## Summary

Set up a minimum height on the viewer container to prevent layout
collapse caused by the absolutely positioned canvas.

## Changes

What: Updated handleResize apply a minimum height style to the parent
element

## Screenshots 
before


https://github.com/user-attachments/assets/0ddb2681-3083-4dfe-b59f-77724072002d

after


https://github.com/user-attachments/assets/672570ad-8792-4e09-8050-6dfcb921cd36

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7815-fix-3d-min-resize-2da6d73d3650811ca66fd82ad13258b9)
by [Unito](https://www.unito.io)

src/components/load3d/Load3DScene.vue

@@ -1,7 +1,7 @@
 <template>
   <div
     ref="container"
-    class="relative h-full w-full"
+    class="relative h-full w-full min-h-[200px]"
     data-capture-wheel="true"
     @pointerdown.stop
     @pointermove.stop