Add animated wave indicator and delay slider

[rbkayz]

Summary

• Added animated audio wave visualization that shows listening state (green when active, red when paused)
• Added delay slider control with 0.5-5 second range in 0.5s increments
• Implemented toggle functionality to start/stop audio feedback by clicking anywhere on the page

Changes

• Visual feedback with animated wave bars instead of text indicator
• Real-time delay adjustment via slider
• Proper cleanup of audio resources when stopping

Test plan

• Open the page in a browser
• Click to start listening - wave should turn green and animate
• Adjust the delay slider - delay should update in real-time
• Click again to stop - wave should turn red and stop animating

🤖 Generated with Claude Code

[vercel]

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