enhance(frontend): complete performance optimization and final integrations

[BjornMelin]

Enhancement Opportunity

Frontend is 75% complete with modern architecture implemented. Complete performance optimization and final integrations for production readiness.

Continuation of: Closed #165 (Next.js Frontend - core architecture complete)

Current Status

✅ Completed Foundation:

• Next.js 15.3.2 with App Router
• React 19, TypeScript 5, Tailwind CSS v4
• 324 TypeScript/TSX files
• Supabase auth integration
• AI-powered chat interface

Remaining Implementation

1. Performance Optimization (Priority: High)

   • Core Web Vitals validation and optimization
   • Bundle size analysis and optimization
   • Image and asset optimization
   • Lazy loading implementation

2. Final Integration Testing (Priority: High)

   • E2E testing with Playwright expansion
   • Complete travel workflow testing
   • Error boundary validation
   • Real-time feature testing

3. Business Logic Completion (Priority: Medium)

   • Complete travel workflow integrations
   • Advanced search functionality
   • Booking flow optimization
   • User preference management

Acceptance Criteria

• Core Web Vitals scores meet production targets
• Bundle size optimized for fast loading
• E2E test coverage complete
• All business workflows functional
• Performance monitoring implemented

Effort Estimate

1-2 weeks - Performance optimization and integration testing

[BjornMelin]

🔗 Linear Integration: This issue is tracked in Linear as BJO-203 for project management coordination.

Linear Issue: https://linear.app/bjorn-dev/issue/BJO-203/enhancefrontend-complete-performance-optimization-and-final

Priority: High - V1 MVP requirement