TECHDOG 1-7 Re-numbering

a script to show techdog tracks like 1-1, 2-7, 6-11 on bandcamp

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// ==UserScript==
// @name         TECHDOG 1-7 Re-numbering
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  a script to show techdog tracks like 1-1, 2-7, 6-11 on bandcamp
// @author       CiNoP
// @license      MIT
// @match        https://patriciataxxon.bandcamp.com/album/techdog-1-7
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function renumber() {
        const tracks = document.querySelectorAll('.track_number');
        tracks.forEach((div, index) => {
            const globalNum = index + 1;
            const n = Math.ceil(globalNum / 11);
            const localNum = globalNum - 11 * (n - 1);
            const newText = `${n}-${localNum}.`;
            
            if (div.textContent !== newText) {
                div.textContent = newText;
                
                div.style.whiteSpace = 'nowrap';
                
                const parentCell = div.closest('.track-number-col');
                if (parentCell) {
                    parentCell.style.width = '45px';
                }
            }
        });
    }

    renumber();
    const observer = new MutationObserver(renumber);
    observer.observe(document.body, { childList: true, subtree: true });
})();