Added new SVG icons, also optimised by removing unnecessary <?xml... ?> header.

web/assets/img/duration.svg

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+<svg version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><circle cx="256" cy="272" r="221.19" fill="#9f2b68" stroke="#000" stroke-width="37.61"/><circle cx="259.01" cy="253.47" r="1.4062"/><path d="m332.82 405.5-72.697-150.72-84.181-65.471" fill="none" stroke="#000" stroke-width="30"/><circle cx="258.25" cy="47.49" r="1.4062"/><g fill="none" stroke="#000" stroke-width="30"><path d="m259.16 95.203-.17231-52.493"/><path d="m255.26 500.7-.17231-52.493"/><path d="m26.75 272.09 52.493-.17232"/><path d="m432.21 272.09 52.493-.17232"/></g></svg>

web/assets/img/favicon.svg

@@ -1,2 +1 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <svg version="1.1" viewBox="0 0 574.17 258.67" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><g fill="#cd2682" aria-label="A'sD"><path d="m131.67 206.33h-66.833l-13 49.667h-51.833l75.833-242.67h44.833l76.333 242.67h-52.333zm-56.167-40.833h45.333l-22.667-86.5z" style="font-variant-caps:small-caps"/><path d="m226 24.667-4.8333 67.5h-30.667v-92.167h35.5z" style="font-variant-caps:small-caps"/><path d="m338.5 203.83q0-9.5-5.6667-15.333-5.5-5.8333-20.833-10.667-34.167-9.3333-47.333-22.833-13.167-13.667-13.167-38.5 0-25 17.667-41.167 17.667-16.167 45.833-16.167 31.5 0 50.167 16.5 18.833 16.333 18.833 44.167h-47q0-11-6-17.833-5.8333-6.8333-15.833-6.8333-8.8333 0-13.833 5.5-5 5.5-5 14 0 8 5.5 13.167 5.6667 5.1667 20.167 10.333 32.667 8.3333 47 23.167t14.333 41-17.333 41.333q-17.333 15-48 15-14.667 0-28.5-4.3333-13.667-4.3333-23.5-13-20-17.333-20-47.333h47.333q0 16.167 6 22.667 6 6.3333 21.167 6.3333 18 0 18-19.167z" style="font-variant-caps:small-caps"/><path d="m416.5 256v-242.67h64.167q42.5 0 67.667 27 25.333 27 25.833 74v39.333q0 47.833-25.333 75.167-25.167 27.167-69.5 27.167zm49-201.83v161.17h14.667q24.5 0 34.5-12.833 10-13 10.5-44.667v-42.167q0-34-9.5-47.333-9.5-13.5-32.333-14.167z" style="font-variant-caps:small-caps"/></g></svg>

web/assets/img/listener.svg

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+<svg version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(1.1429 0 0 1.1429 -36.128 15.982)" stroke="#000" stroke-width="40" style="paint-order:normal"><path transform="scale(-1)" d="m-60.17-296.45a200.55 200.55 0 01-83.602 209.44 200.55 200.55 0 01-225.51-.71844 200.55 200.55 0 01-82.266-209.97" fill="none" style="paint-order:normal"/><path d="m459.59 316.81a44.801 97.191 0 01-44.801 97.191 44.801 97.191 0 01-44.801-97.19 44.801 97.191 0 0144.8-97.192 44.801 97.191 0 0144.802 97.189" fill="#9f2b68" style="paint-order:normal"/><path d="m51.611 316.81a44.801 97.191 0 0144.801-97.19 44.801 97.191 0 0144.801 97.191 44.801 97.191 0 01-44.801 97.19 44.801 97.191 0 01-44.801-97.191" fill="#9f2b68" style="paint-order:normal"/></g></svg>

web/assets/img/note.svg

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+<svg version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path transform="matrix(.9978 .066276 -.61683 .78709 0 0)" d="m592.2 522.06c0 19.539-8.204 38.278-22.808 52.095-14.605 13.816-34.412 21.578-55.065 21.578s-40.46-7.762-55.064-21.578c-14.604-13.817-22.809-32.556-22.809-52.095 0-19.54 8.205-38.279 22.809-52.095 14.604-13.817 34.411-21.579 55.064-21.579 43.008 0 77.873 32.985 77.873 73.674z" fill="#9f2b68" stroke="#000" stroke-width="22.245"/><path d="m289.88 415.68c0 .503-.2.985-.555 1.341-.356.355-.838.555-1.341.555-1.046 0-1.895-.849-1.895-1.896 0-1.046.849-1.895 1.895-1.895.503 0 .985.2 1.341.555.355.356.555.838.555 1.34z" stroke-width="1.2638"/><path d="m281.19 408.95c0 1.047-.849 1.895-1.896 1.895s-1.896-.848-1.896-1.895c0-.503.2-.985.556-1.341.355-.355.837-.555 1.34-.555s.985.2 1.34.555c.356.356.556.838.556 1.341z" stroke-width="1.2638"/><path d="m280.73 32.078v384.56" fill="none" stroke="#000" stroke-width="27"/><path d="m293.03 52.222c77.939.0697 9.165 140.67 121.96 195.68" fill="none" stroke="#000" stroke-width="40.44"/></svg>

web/assets/img/play.svg

@@ -1,2 +1 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <svg version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><path transform="matrix(.75195 -.012986 .014978 .65194 38.971 49.316)" d="m-25.978 46.549 1.6542-92 78.847 47.433-40.251 22.284z" stroke-width=".26458"/><circle cx="50" cy="50" r="47.585" fill="none" stroke="#000" stroke-width="4.8301"/></svg>

web/assets/img/stop.svg

@@ -1,2 +1 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <svg version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><path transform="matrix(.75195 -.012986 .014978 .65194 38.971 49.316)" d="m-25.978 46.549 1.6542-92 78.847 47.433-40.251 22.284z" stroke-width=".26458"/><circle cx="50" cy="50" r="47.585" fill="none" stroke="#000" stroke-width="4.8301"/><rect x="20.886" y="20.886" width="58.228" height="58.228" rx="57.392" ry="0" stroke="#000" stroke-width="1.7724"/></svg>