Feature/moose 351/border settings

[Vinsanity]

What does this do/fix?

This pull request adds and configures border support for several core blocks in the theme, and introduces a JavaScript filter to relabel the "Shadow" option in the editor UI for improved clarity. The changes also include a workaround for a known Gutenberg label bug.

The most important changes are:

Editor UI Improvements:

• Added a new filters module (editor/filters/index.js) that registers an i18n filter to relabel the "Shadow" label to "Border & Shadow" in the block editor, addressing a Gutenberg label bug. This filter is initialized as part of the editor setup. [1] [2] [3]

Theme Block Support Enhancements:

• Enabled border support (color, radius, style, width) for core/columns, core/cover, and core/group blocks in theme.json. [1] [2]
• Enabled shadow support for the core/group block in theme.json.

Global Theme Settings:

• Added global border settings to theme.json, explicitly disabling border color, radius, style, and width by default to ensure block-level control.

QA

Links to relevant issues

• Link to Issue

Screenshots/video:

• Link to Video

Pull request checklist

• I've added a changelog entry for these changes.
• I've linked to a relevant Jira issue.
• I've captured a screenshot or screencast of the changes and linked it above.

[dpellenwood]

🍏