Enhance styling system with new themes and fix modal theming consistency
- Add 4 new dark themes: Midnight, Charcoal, Nord, Dracula with complete CSS variable definitions - Create Apple Calendar style with glassmorphism effects and theme-aware design - Fix Google Calendar style to be theme-aware instead of using hardcoded colors - Replace hardcoded colors in modal CSS with theme variables for consistent theming - Add data-style attribute support to document root for style-specific CSS selectors - Update sidebar dropdowns to include all new theme and style options 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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