ErrorDisplayWidget class

A reusable widget for displaying error states with consistent styling.

This widget provides a standard way to display errors across the app, including an error icon, message, and optional retry button.

Usage examples:

// Full-size error widget for main content areas
ErrorDisplayWidget(
  message: 'Failed to load data',
  onRetry: () => refreshData(),
)

// Compact error widget for smaller spaces like horizontal lists
ErrorDisplayWidget.compact(
  message: 'Failed to load movies',
  onRetry: () => retryLoad(),
)

// Error widget without retry button
ErrorDisplayWidget(
  message: 'No internet connection',
)