[WIP] Theme Entitlements: Pro-only Themes (Futuristic, Neon, Floral)

[Copilot]

• Analyze existing codebase structure and theme system
• Identify files to create and modify for theme entitlements
• Create entitlement status and theme type models
• Implement entitlement service with offline caching
• Create analytics service for theme events
• Add premium theme definitions (Futuristic, Neon, Floral)
• Extend theme service with pro theme support and auto-fallback
• Create enhanced theme picker widget with lock icons
• Update main app to initialize new services and providers
• Add comprehensive tests for models and services
• Integrate theme picker into settings screen
• Add paywall integration for Pro themes
• Implement subscription lapse handling
• Manual testing and UI verification

Implemented core theme entitlements infrastructure:

New Models:

• ThemeType enum with premium status and metadata
• EntitlementStatus model for subscription tracking

New Services:

• EntitlementService - manages subscription status with offline caching
• AnalyticsService - tracks theme interaction events
• Enhanced ThemeService - supports premium themes and auto-fallback

Premium Themes:

• Futuristic theme (tech/sci-fi aesthetic)
• Neon theme (vibrant cyberpunk colors)
• Floral theme (nature-inspired palette)

Key Features:

• Offline entitlement caching with 24h refresh cycle
• Auto-fallback to Dark mode when Pro subscription expires
• Lock icons and upsell prompts for premium themes
• Comprehensive analytics tracking
• Full test coverage for core functionality

Fixes #35.

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