Implemented Android subscription UI components:
- UpgradeFeatureScreen: Full-screen view for restricted features (contractors, documents)
* Shows feature icon, name, and description
* Displays "This feature is available with Pro" badge
* Opens UpgradePromptDialog on button click
- UpgradePromptDialog: Modal dialog with upgrade options
* Trigger-specific title and message from backend
* Feature preview list with Material icons
* "Upgrade to Pro" button with loading state
* "Compare Free vs Pro" button
* "Maybe Later" cancel option
- FeatureComparisonDialog: Full-screen comparison table
* Free vs Pro feature comparison
* Displays data from SubscriptionCache.featureBenefits
* Default features if no data loaded
* Upgrade button
- BillingManager: Google Play Billing Library placeholder
* Singleton manager for in-app purchases
* Product query placeholder
* Purchase flow placeholder
* Backend receipt verification placeholder
* Restore purchases placeholder
All components follow Material3 design system with theme-aware colors and spacing constants.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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