add search bar on home screen

[shaurya-8055]

Search Bar Implementation Summary

I have successfully implemented a fully functional search bar for the wallpaper app. Here's what was added:

🔍 Features Implemented:

Search Bar Widget (search_bar_widget.dart)

• Clean, modern design with glassmorphism effect

• Real-time search as you type

• Visual feedback with color-changing search icon

• Clear button that appears when typing

• Dark/light theme support

• Enhanced WallpaperProvider (updated wallpaper_provider.dart)

• Added search functionality that filters by both title and category

• Case-insensitive search

• Search query management methods

• Updated pagination to work with filtered results

• No Results Widget (no_results_widget.dart)

• Displays when no wallpapers match the search criteria

• User-friendly message showing the search query

• Clear search button for easy reset

• Consistent theming

• Updated Home Screen (modified home_screen.dart)

• Integrated search bar at the top of the app

• Conditional display of no results widget

• Proper layout adjustment for search bar

🎯 How it Works:

• Search by Title: Type "Mountain" to find wallpapers with "Mountain" in the title
• Search by Category: Type "Nature" to find all wallpapers in the Nature category
• Combined Search: Search works across both title and category simultaneously
• Real-time Filtering: Results update as you type
• Category + Search: You can combine category selection with search for more precise filtering

✅ Testing:

• Created comprehensive unit tests covering all search functionality
• Tests verify search filtering, clear functionality, and UI components
• All tests pass successfully

🎨 UI/UX Features:

• Search bar positioned prominently at the top
• Smooth animations and transitions
• Visual feedback when searching (icon color changes)
• Professional no-results screen with clear action buttons
• Maintains existing app design language and theming
• The search functionality is now fully operational and integrates seamlessly with the existing app architecture. Users can easily find wallpapers by typing in titles or categories, and the app provides clear feedback when no results are found.
  [Feature]: Search Wallpapers #2

[shaurya-8055]