feat: skip css updates if progress hasn't changed

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2346>

front/src/composables/audio/player.ts

@@ -167,12 +167,20 @@ export const usePlayer = createGlobalState(() => {
   }, 1000)
 
   // Progress
+  let lastProgress = 0
   useRafFn(() => {
     const sound = currentSound.value
-    document.documentElement.style.setProperty('--fw-track-progress', sound
-      ? `${(sound.currentTime / sound.duration * 100).toFixed(Math.log(window.innerWidth))}%`
-      : '0'
-    )
+    const progress = sound
+      ? +(sound.currentTime / sound.duration * 100).toFixed(Math.log(window.innerWidth))
+      : 0
+
+    if (progress !== lastProgress) {
+      lastProgress = !isNaN(progress)
+        ? progress
+        : 0
+
+      document.documentElement.style.setProperty('--fw-track-progress', `${lastProgress}%`)
+    }
   })
 
   // Loading