Add interactive color palette generator web application

[Copilot]

Implements a browser-based color palette generator in response to request for JavaScript project.

Implementation

• Core application (app.js, 230 lines): ES6 class-based architecture with event-driven color generation, individual color locking via Set-based state management, and LocalStorage persistence (max 20 palettes)
• UI/UX (index.html, style.css): Responsive grid layout with CSS animations, clipboard API integration for hex code copying, keyboard shortcuts (Space to regenerate), Japanese localized interface
• Features: Random RGB generation with hex conversion, per-color lock/unlock toggles that persist through regeneration cycles, visual feedback notifications, saved palette restoration

Technical Details

classColorPaletteGenerator{constructor(){this.paletteSize=5;this.lockedColors=newSet();// Preserves colors during regenerationthis.savedPalettes=this.loadSavedPalettes();}generatePalette(){for(leti=0;i<this.paletteSize;i++){if(!this.lockedColors.has(i)){// Only regenerate unlocked colors}}}}

Screenshots

Initial state with generated palette:

With locked color and saved palettes:

Zero security vulnerabilities (CodeQL scan clean).

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