fix: ensure video unmuted in async play callbacks after loop

engine/core/VideoManager.ts

@@ -77,6 +77,7 @@ export class VideoManager {
     this.elB!.style.opacity = '0'
 
     this.waitReady(this.elA).then(() => {
+      this.elA!.muted = false
       this.elA!.currentTime = 0
       this.elA!.play().catch(() => {})
     })
@@ -124,6 +125,7 @@ export class VideoManager {
     this.switching = true
 
     inactive.currentTime = 0
+    inactive.muted = false
     inactive.play().catch(() => {})
 
     active.style.transition = `opacity ${this.crossFadeMs}ms ease`