fix: artwork progress bar flash

src/themes/blur/artwork-controller/element.js

···
             <!-- PROGRESS -->
 
             <div class="progress" @click="${this.seek}">
-              <progress max="100" value="${(this.audio()?.progress() ??
-                0) * 100}"></progress>
+              <progress max="100" value="${(this.audio()?.loadingState() === "loaded" ? (this.audio()?.progress() ?? 0) : 0) * 100}"></progress>
               <div class="timestamps">
                 <time datetime="${this.#time.value}">${this.#time.value}</time>
                 <time datetime="${this.#time.value}">${this.#duration