Preview panel does not display images referenced by URL (Android and iOS)

Description
Images referenced by a URL do not render in the feature Preview panel in the mobile app. When an attribute/image widget points to a remote image (HTTP/HTTPS), the panel shows no image (blank/placeholder) even though the URL is publicly accessible and opens in a browser.

Example URL used for testing (public):
https://naschov.cz/wp-content/uploads/2023/04/3-1024x1024.jpg

This reproduces on both Android and iOS.

Environment
PROD

Application (+ app version, build, operating system)

• Actual Android app version: 2025.6.0
• Samsung Galaxy A53 5G, Android 15
• Actual iOS app version: 2025.6.0
• Actual iOS version: iOS 26.0

Steps to reproduce

1. Open a project tester-ws-1/tc05_preview_panel
2. Click on 3rd point (from left): preview panel with URL image -> Image is not visible in the Preview panel.

Actual results

• The Preview panel does not render the image referenced by the URL (appears blank/no image).

Expected results

• The Preview panel should display images referenced by valid HTTP/HTTPS URLs (where reachable) or provide a clear error if blocked (e.g., unsupported scheme or fetch failure).
• Ideally, the app should cache the image locally for offline reuse once fetched.

Screenshots or logs

Conclusion
Created by GitHub Copilot and supervised by a human test analyst.

Reproduce the issue in tester-ws-1/tc05_preview_panel using the provided public image URL, on both Android and iOS. Trace the Preview panel's handling of remote HTTP/HTTPS images and define done as displaying reachable images or showing a clear fetch or scheme error; local caching is an additional expected behavior to assess.