ui/warnings/WarningsScreen.kt: full implementation replacing placeholder.
Shows expiry warnings (colored by urgency: URGENT=error, WARNING=orange)
and min-stock warnings as individual cards in a LazyColumn. Displays
empty state when no warnings exist.
ui/warnings/WarningsViewModel.kt: HiltViewModel observing ItemRepository
flow, delegates to GetExpiryWarningsUseCase and GetMinStockWarningsUseCase.
Exposes WarningsUiState via StateFlow.
ui/warnings/WarningsUiState.kt: data class with expiryWarnings,
minStockWarnings, isLoading, and derived properties (totalWarningCount,
hasWarnings).
ui/dashboard/DashboardScreen.kt: replaced ExpiryWarningsCard and
MinStockWarningsCard with compact WarningsSummaryCard showing only
warning counts. Removed unused domain model imports.
tests: 7 WarningsViewModel unit tests covering empty state, expiry
warnings, min-stock warnings, combined counts, reactive updates.
Closes#34
34bd1f603f