[Image v3] #2263: Add fetchpriority attribute support

[aldunchev]

Q	A
Fixed Issues?	Fixes #2263
Patch: Bug Fix?	no
Minor: New Feature?	Yes
Major: Breaking Change?	no
Tests Added + Pass?	Yes
Documentation Provided	Yes (code comments and or markdown)
Any Dependency Changes?	No
License	Apache License, Version 2.0

Add fetchpriority attribute support to Image component (v3)

Implements fetchpriority attribute for the Image component to optimize Largest Contentful Paint (LCP) performance.

Changes:

• Added policy-level configuration in design dialog (default fetchpriority + override toggle)
• Added component-level override in edit dialog
• Implemented decision logic: component value overrides policy value (if allowed)
• Added getFetchPriority() method and updated getHtmlAttributes() in Image interface
• Added 5 unit tests covering all scenarios

Usage:

Template authors can set default fetchpriority ("high", "low", "auto") in policies and optionally allow content authors
to override per component. Useful for marking hero images as "high" priority to improve LCP.

Fixes #2263

[aldunchev]

Here is the checkbox to allow the authors to change the fetchpriority attribute:

The fetch priority on the image:

The final result:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud