Add Basic Frequency Visualization with P5.js

[brylie]

Create a visual representation of the binaural beats using P5.js to make the experience more immersive. The visualization should show the frequencies combined with beats.

Considerations:

• Integrate P5.js library into the project
• Create a canvas for the visualization
• Represent base frequency and beat frequency visually
• Animate the visualization in real-time as frequencies change
• Ensure the visualization is performant and doesn't interfere with audio generation
• Make the visualization accessible (e.g., can be turned off for users who prefer no visuals)