feat: Remove interrupt and update priority’s values to align with latest spec

[smockle]

Fixes #9

PR Overview

This PR removes the interrupt functionality and updates the priority values from the legacy spec ("important"/"none") to the latest spec ("high"/"normal"). Key changes include:

• Removal of the interrupt property, its associated getter, and related code in the Message class.
• Updates to the priority type and default value in the Message class and the ariaNotify method.
• Adjustments in the enqueue method for inserting messages according to the new "high" priority.

Changes

File	Description
ariaNotify-polyfill.js	Removed interrupt support and updated priority values in accordance with the latest spec.

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

ariaNotify-polyfill.js:37

• The 'matches' method has been removed along with interrupt-based comparisons. Please ensure that any message equivalence or queue filtering logic relying on this method is refactored appropriately according to the new spec.

matches(message) {

ariaNotify-polyfill.js:169

• The interrupt parameter has been removed from the 'ariaNotify' method. Please double-check that all callers and any related tests or downstream logic have been updated to work with the new priority-only design.

Element.prototype["ariaNotify"] = function ( message, { priority = "normal" } = {} ) {

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[keithamus]

Looks great!