Improve code quality and user experience in frontend

[zane-ld-app]

Summary

This PR improves the code quality, error handling, and user experience of the Party Parrot as a Service frontend application.

Key Improvements:

• Better Error Handling: Added comprehensive error handling for Supabase queries and API calls with user-friendly error messages
• Enhanced UX: Replaced alert() with proper error/success notifications that can be dismissed
• Improved Clipboard Functionality: Enhanced clipboard copying with fallback support for older browsers and better user feedback
• Code Quality Fixes: Fixed missing return statements in getHeight() function that could cause runtime issues
• Performance Optimizations: Replaced inefficient random sort with Fisher-Yates shuffle algorithm for better performance
• Accessibility Improvements: Added proper alt text and ARIA labels for better screen reader support
• Type Safety: Added proper TypeScript interfaces and improved type definitions
• Best Practices: Implemented proper async/await patterns and added constants for magic numbers

Technical Changes:

• Added ParrotData interface for better type safety
• Introduced constants: DISPLAY_PARROT_COUNT, SUCCESS_DELAY, MOBILE_BREAKPOINT
• Improved getHeight() function with proper return statements and clearer logic
• Enhanced onFormSubmit with proper error handling and response validation
• Added handleCopyToClipboard function with fallback support
• Implemented user-friendly error and success message components
• Added lazy loading to images for better performance

Test plan

• Verify error messages display properly when backend is unavailable
• Test clipboard functionality works in both modern and older browsers
• Confirm all form submissions handle errors gracefully
• Validate improved accessibility with screen readers
• Check responsive behavior still works correctly
• Ensure parrot selection and display functions properly

🤖 Generated with Claude Code