feat: GutenbergKit supports mentions and cross-posts

[dcalhoun]

Description

Close CMM-454. Dependent upon wordpress-mobile/GutenbergKit#165.

Leverage GutenbergKit's onAutocompleterTriggered event and
appendTextAtCursor method for displaying and inserting @mention and
+cross-post suggestions.

Testing instructions

Explore @mention and +cross-post autocompletion. Try inserting triggers at various locations to verify expected behavior:

• <line-start>@<cursor>
• @text<cursor>
• text@<cursor>
• text @<cursor>more
• text more@<cursor>

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	28505
	Version	PR #24733
	Bundle ID	org.wordpress.alpha
	Commit	f943390
	Installation URL	13rmb7siop5vg

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	28505
	Version	PR #24733
	Bundle ID	com.jetpack.alpha
	Commit	f943390
	Installation URL	3kmt8gbnnlafo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[Copilot]

Pull Request Overview

This PR integrates GutenbergKit's autocompleter functionality to support @mention and +cross-post suggestions in the WordPress editor. The implementation leverages GutenbergKit's new onAutocompleterTriggered event and appendTextAtCursor method to provide a seamless user experience for mentions and cross-posts.

• Implements autocompleter delegate method to handle mention and cross-post triggers
• Adds keyboard observation and constraint management for suggestions UI
• Updates GutenbergKit dependency to support new autocompleter functionality

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
NewGutenbergViewController.swift	Main implementation of autocompleter functionality with keyboard handling and suggestions UI
CommentGutenbergEditorViewController.swift	Adds empty implementation of autocompleter delegate method
Package.swift	Updates GutenbergKit dependency to specific revision with autocompleter support
Package.resolved	Updates resolved package state for GutenbergKit

Comments suppressed due to low confidence (1)

WordPress/Classes/ViewRelated/NewGutenberg/NewGutenbergViewController.swift:58

• Using a specific revision instead of a semantic version makes dependency management difficult and prevents automatic updates. Consider using a tagged version once the GutenbergKit changes are released.

            refreshInterface()

[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