)

## Summary

Fixes image/video previews getting stuck in loading state when widgets
are added dynamically to a node.

## Problem

When dynamic widgets are added to a node (e.g., by extensions), Vue
reactivity triggers the watch on `imageUrls` prop even when the URL
content is identical—the array has a new reference but the same values.
This caused:
1. `startDelayedLoader()` to reset loading state to pending
2. If the cached image doesn't trigger `@load` before the 250ms timeout,
the loader shows and stays stuck

## Solution

Compare URL arrays by content, not reference. Only reset loading state
when URLs actually change:
- Check array length and element-by-element equality
- Return early if URLs are identical (just a new array reference)
- Remove `deep: true` since we compare manually

## Screenshots

<img width="749" height="647" alt="image"
src="https://github.com/user-attachments/assets/3a1ff656-59ed-467a-a121-b70b91423a50"
/>


<img width="749" height="647" alt="Screenshot from 2026-01-28 15-24-18"
src="https://github.com/user-attachments/assets/28265dad-1d79-47c8-9fd4-5a82b94e72cd"
/>

<img width="749" height="647" alt="Screenshot from 2026-01-28 15-24-05"
src="https://github.com/user-attachments/assets/c7af93b7-c898-405f-860b-0f82abe5af6d"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8366-fix-prevent-image-video-preview-reset-on-dynamic-widget-addition-2f66d73d3650819483b2d5cbfb78187f)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Subagent 5 <subagent@example.com>
Co-authored-by: Amp <amp@ampcode.com>