Add Favorites/Bookmarks Feature

[DrunkOnJava]

⭐ Implement Favorites System

Current State

• TODO comment in ItemsListViewModel indicates favorite flag missing
• No favorite/bookmark functionality in Item model
• Filter for favorites exists but non-functional

Required Implementation

1. Data Model Updates

   • Add isFavorite: Bool to Item model
   • Update repository save/fetch to include favorite status
   • Add favorite toggle method

2. UI Components

   • Star/heart icon on item rows
   • Quick toggle animation
   • Favorites filter in toolbar
   • Favorites badge count

3. User Experience

   • Swipe action to favorite/unfavorite
   • Bulk selection for favorites
   • Sort by favorite status
   • Favorites dashboard widget

Code Changes

// Item model addition
var isFavorite: Bool = false

// Repository method
func toggleFavorite(_ item: Item) async throws

Acceptance Criteria

• Users can mark items as favorites
• Favorites persist between sessions
• Filter by favorites works correctly
• Smooth toggle animations

Parent Epic

Related to #106 (UI/UX Implementation Gaps)

[DrunkOnJava]

Closing: This issue has been resolved/superseded by the complete modular architecture restructure now in main branch (commit 33a0ead). The new architecture implements a comprehensive solution that addresses the core needs this issue was tracking.