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

class ColorPaletteGenerator {
    constructor() {
        this.paletteSize = 5;
        this.lockedColors = new Set();  // Preserves colors during regeneration
        this.savedPalettes = this.loadSavedPalettes();
    }
    
    generatePalette() {
        for (let i = 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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