Add toggle group support with default toggle functionality

[jeremyfelt]

Summary

This PR adds support for toggle groups, allowing multiple toggle blocks to be organized together where only one can be active at a time. It also introduces a "default toggle" feature that automatically activates a specified toggle when no toggle in the group is currently active.

Key Changes

• Refactored toggle logic: Split the monolithic handleClick function into smaller, reusable functions:

  • toggleOn(): Handles showing a controlled element
  • toggleOff(): Handles hiding a controlled element
  • getToggleGroup(): Finds the parent toggle group
  • getGroupToggles(): Gets all toggles within a group
  • getDefaultToggle(): Finds the default toggle in a group

• Toggle group behavior: When a toggle is clicked within a group:

  • Opening a toggle automatically closes all other toggles in the group
  • Closing the active toggle activates the default toggle (if one exists)
  • Toggles outside groups maintain original toggle behavior

• Default toggle initialization: Added initialization logic that activates the default toggle in each group on page load if no toggle is already active

• UI enhancements: Added a "Default toggle" toggle control in the block editor inspector panel

• Block attributes: Added defaultToggle boolean attribute to track which toggle should be the default in a group

• Deprecated version: Added a deprecated block version to maintain backward compatibility with existing toggle blocks

Implementation Details

• The handleClick function now uses closest() to find the toggle button, making it more robust for nested elements
• Toggle groups are identified by the .toggle-block-group CSS class
• Default toggles are marked with the data-default-toggle="true" attribute
• The initialization logic checks if any toggle in a group is already active before activating the default toggle

https://claude.ai/code/session_019mVP8YLjaU9V5LEzsujoCL

[github-actions]

Changed files were detected after build. Please run project build workflows and check git status for any missed changes.

 M build/toggle-block/block.json
 M build/toggle-block/index.asset.php
 M build/toggle-block/index.js
 M build/toggle-block/view.asset.php
 M build/toggle-block/view.js

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• Node v22.22.0
• NPM 11.11.0