Empty States and Error Boundaries

[Luluameh]

Source: FRONTEND_ISSUES.md (Issue 18)

Background
When data fails to load or lists are empty, the user should see friendly messages.
Goal
Implement reusable empty state components and React Error Boundaries.
Acceptance Criteria

• Create EmptyState component with illustration support.
• Wrap main app routes in a custom ErrorBoundary.
  Key Files
  src/components/Empty/EmptyState.tsx, src/components/providers/ErrorBoundary.tsx

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