Build the Phase 2 catalogue app.

The final project proves you can build a small, complete app instead of isolated screens. Keep scope tight and polish the states.

Required screens

Simple UI state

sealed interface CatalogueUiState {
    data object Loading : CatalogueUiState
    data class Success(
        val businesses: List<Business>,
        val query: String,
        val category: String?
    ) : CatalogueUiState
    data object Empty : CatalogueUiState
    data class Error(val message: String) : CatalogueUiState
}

This app is ready for Phase 3 when state, navigation, data, and error behavior are explicit.

Review checklist

• List, detail, favourites, and settings screens are reachable.
• Search and filters work together.
• Empty and error states are visible and useful.
• Favourite selection survives app restart.
• Call, map, and share actions fail gracefully when data is missing.
• README contains screenshots and a short architecture note.