Fix hardcoded API paths: inject URLs via url_for() in template, read from window.NEUSICIAN_URLS in api.js

static/components/PaneCP.js

@@ -1,5 +1,5 @@
 import { h, ref } from 'vue';
-import { fetchScoreText, putScoreText } from '../api.js';
+import { fetchScoreText, putScoreText, URLS } from '../api.js';
 import { patchScore } from '../exporter.js';
 import { StatusPoller } from './StatusPoller.js';
 
@@ -127,7 +127,7 @@ export const PaneCP = {
                 store.synthesisStatus?.file_accomplished
                     ? h('audio', {
                         controls: true,
-                        src: '/sompyle/result.mp3',
+                        src: URLS.result,
                         style: 'display:block;width:100%;margin-top:0.5rem',
                       }) : null,
             ]);