fix: enable keyboard controls for harmonics across all modes (#118)

[IanMayo]

Summary

• Fixed keyboard arrow key controls for harmonic sets in analysis and doppler modes
• Replaced mode-dependent harmonic updates with direct state management in keyboard control system
• Maintained clean architecture by avoiding harmonic-specific methods in BaseMode class

Technical Changes

• Modified moveSelectedHarmonicSet() in keyboardControl.js to handle harmonic updates directly
• Replaced instance.currentMode.updateHarmonicSet() calls with inline state management
• Added proper UI updates and state listener notifications for cross-mode consistency

Issue Resolution

Resolves #118 - keyboard commands now work for harmonics when selected in any mode (analysis, doppler, harmonics), not just harmonics mode.

Test Plan

• All existing tests pass (59/59)
• TypeScript compilation successful
• Build process completes without errors
• Keyboard controls work for harmonics in all modes
• No regression in existing harmonic functionality

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