[Bug]: Sound stops when switching away from browser on iOS

[JohnMcW]

Bug Description

Sound stops when switching away from a browser on iOS and when returning to the browser, it can't be restarted without refreshing the browser.

Steps To Reproduce

1. Go to: "https://brainwave.digitalcuriosity.center/"
2. Click on "Start" (sound starts correctly)
3. Go to device's home page
4. Sound stops
5. Return to browser
6. Click on "Start" (no sound is heard)
7. Refresh page - sound can be restarted OK

Expected Behavior

Sound should continue

Screenshots

n/a

Environment

• BrainWave Version: 0.6.5
• Deployment Method: demo site: https://brainwave.digitalcuriosity.center/
• Browser: Safari & Chrome 145.0.7632.41
• OS: iOS 26.2.1 / iPhone SE generation 2

Additional Information

Add any helpful contextual information relating to the problem.