feat: add dynamic theme switching system

[idan]

Added a theme switching system that allows users to choose between four color themes: purple, red, blue, and green.

Changes include:

• Created ThemeContext.tsx to manage theme state with localStorage persistence
• Created ThemeChooser.tsx component with interactive theme selector buttons
• Wrapped App with ThemeProvider in main.tsx to provide theme context
• Added initialization script in index.html to load theme from localStorage on page load
• Updated App.tsx to render ThemeChooser component in the header
• Modified index.css with theme-specific CSS variables using @theme and [data-theme] selectors
• Replaced hardcoded orange colors with accent-200 custom color that responds to theme changes
• Theme selection persists across page reloads with purple as the default theme

Also updated bun.lock file with configVersion field in lockfile metadata.

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