fix dragging video/image components on Vue nodes triggers node drag (#5922)

## Summary

Fixed pointer capture behavior on video and image preview components to
prevent unintended node dragging. Below video shows behavior after fix:


https://github.com/user-attachments/assets/95563a2d-8958-47e1-a19c-977fb539d162

## Changes

- **What**: Added `data-capture-node="true"` attribute to
`VideoPreview.vue` and `ImagePreview.vue` components
- **What**: Enhanced `useNodePointerInteractions.ts` composable to
detect and handle pointer events on elements with capture attribute

## Review Focus

Pointer event delegation logic and interaction behavior between preview
components and canvas drag operations.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5922-fix-dragging-video-image-components-on-Vue-nodes-triggers-node-drag-2826d73d365081ce83e7fd61510167e2)
by [Unito](https://www.unito.io)

---------

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

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

@@ -2,6 +2,7 @@
   <div
     v-if="imageUrls.length > 0"
     class="image-preview relative group flex flex-col items-center"
+    data-capture-node="true"
     tabindex="0"
     role="region"
     :aria-label="$t('g.imagePreview')"