Add Universal Editor domain-based action button extension

[fe-lix-]

Summary

• New universal-editor-domain-button-sample extension for the Universal Editor (universal-editor/ui/1)
• Adds a header menu action button whose visibility is controlled by AEM Cloud program/environment IDs
• Reads the current editor location via guestConnection.host.editorState.get() and parses author-p{programId}-e{environmentId} from the URL
• Configuration (set in Extension Manager) accepts program: string[] and environment: string[] — empty arrays mean visible everywhere

Configuration

{
  "program": "[\"62254\"]",
  "environment": "[\"555348\"]"
}

program configured	environment configured	Behaviour
No	No	Always visible
Yes	No	Visible if current program ID is in the list
No	Yes	Visible if current environment ID is in the list
Yes	Yes	Visible only if both match

Test plan

• npm install && aio app run from universal-editor-domain-button-sample/
• Open Universal Editor — button appears with no configuration set
• Set program to a non-matching ID → button is hidden
• Set correct program/environment IDs → button is visible
• Click button → modal opens

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