[WIP] Make improvements to project features

[Copilot]

Improvements to Sinusoidal Wave Integration (PR #25)

Critical Bug Fixes

• Fix HeadyLensHoverWave missing this.options storage (sinusoidal_wave.js:168)
• Add null check for canvas context in SinusoidalWaveEngine
• Fix pulse() method cleanup - store animation frame IDs for proper cancellation
• Add input validation to customize() method with proper bounds checking

Code Quality Improvements

• Add proper error handling for canvas operations
• Improve module export checks for browser compatibility
• Enhance localStorage error handling (quota exceeded, parse errors)
• Add logging for silent failures in preference saving

Accessibility Enhancements

• Add prefers-reduced-motion media query support to SinusoidalWaveEngine
• Improve ARIA labels and canvas accessibility
• Enhance high contrast mode for all colors (not just golden)
• Add better colorblind mode descriptions

Performance Optimizations

• Add debouncing to localStorage saves (prevent thrashing)
• Optimize pixel iteration for large canvases
• Cache getAccessibleSettings() results

Testing Improvements

• Fix Node.js test execution (currently exits immediately)
• Add canvas dimensions to test setup
• Add tests for accessibility features
• Add tests for edge cases and error conditions

Documentation

• Document all code fixes and improvements
• Add inline comments for complex logic

Original prompt

Pull request: #25
make improvements

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