feat: add theme switcher with multiple color options

[idan]

Add a comprehensive theme switcher feature allowing users to select between multiple color themes (orange, purple, green, blue, and teal).

Changes:

• Added Theme type and themes array defining five available color options
• Implemented theme state management with localStorage persistence to retain user preference across sessions
• Added useEffect hook to sync selected theme to DOM data-attribute and localStorage
• Created interactive color swatch buttons in the header for easy theme selection
• Refactored gradient and hover colors to use CSS variable --accent instead of hardcoded color values
• Added CSS custom properties in index.css to define accent colors for each theme
• Implemented visual feedback for selected theme with ring and scale effects
• Updated bun.lock with configVersion field
• Added 'teal' as a new theme color option with corresponding CSS variable definition

Created by GitHub Ace · View Session