Icons: There are icon files that are not used in the icon registry

[wildworks]

Follow-up to #64651

The icons published by the icon registry are determined by ​this manifest PHP file. This PHP file is copied from ​this manifest PHP file, which is auto-generated in the Gutenberg repository.

To avoid localizing unused icon labels, we filter all icons from the @wordpress/icons package and extract only the icons that are actually published into the manifest PHP file. Please refer to ​Gutenberg PR #75684 for details.

However, ​the Gutenberg sync process copies all SVG icons, adding a large number of icons to the core that are not used in the icon registry. This is not what was intended, so I believe we need to improve the synchronization process.

The core icon registry (WP_Icons_Registry) only loads the icons listed in icon-library-manifest.php (88 icons), but the build copied every SVG from the @wordpress/icons library (331 files) into wp-includes/images/icon-library. This shipped 243 unused SVG files to core that are never served.

This has been the case since the icon library was introduced: the SVG copy used a *.svg glob, while only the manifest subset is exposed.

This PR:

• Limits the copy:icon-library-images Grunt task to the SVGs referenced by the manifest, by parsing its filePath entries. It throws if the manifest is missing so the build fails loudly instead of silently copying nothing.
• Removes the 243 unused SVG files already committed under wp-includes/images/icon-library, leaving only the 88 manifest-listed icons.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 4.8
Used for: Investigating the manifest/SVG mismatch, implementing the Gruntfile change, and regenerating the icon set. All changes were reviewed and verified by me.

However, I think I'd like to try an approach similar to ​WordPress/gutenberg#76715 where SVG icons that are not marked "public": true do not get included in the Zip file at all.

I still need to add proper PR descriptions, but ​https://github.com/WordPress/gutenberg/pull/79338 is a rough idea of what this could look like being handled by ​WordPress/gutenberg.

#12224 is the PR for wordpress-develop demonstrating that it works.

I still need to add proper PR descriptions, but ​https://github.com/WordPress/gutenberg/pull/79338 is a rough idea of what this could look like being handled by ​WordPress/gutenberg.

Thank you, that approach seems better. Let's close this PR.

[sachinrajcp123]

Tested on Windows using the local wordpress-develop environment. Checked out PR #12223. Ran npm run build successfully. Verified that the icon library builds successfully (88 SVGs). Confirmed that icons render correctly in the block editor (including Social Icons and Navigation blocks). No missing icons or icon-related console errors were observed.