Duplicate ProtectedRoute import from two modules

[DooseWayo]

Summary

Resolves #

Changes

What was fixed

Primary target (App.tsx)

Issue | Fix -- | -- Duplicate ProtectedRoute import from two modules | Kept only components/auth/ProtectedRoute (richer, with useAuthGuard + fallback prop) Broken AppContent with a nested  inside it | Deleted AppContent; merged the correct RoutedContent into a clean AppContent Stray  / misplaced  outside JSX return | NotificationProvider moved into the provider chain in App Second  in App wrapping AppContent | Removed the outer router; single  now lives inside App's provider tree

Verification & Testing

• npm test (Backend/Frontend)
• cargo test (Smart Contracts)
• cargo fmt --check && cargo clippy (Contract Linting)

Contributor Checklist

• PR title follows Conventional Commits (feat:, fix:, docs:, etc.)
• All CI checks pass locally
• Documentation updated in docs/ or README.md if applicable
• No secrets or credentials committed
  Closes Consolidate duplicate router tree and fix import conflicts in App.tsx #471
  Closes Implement internationalization (i18n) coverage for all user-facing strings #472
  Closes Implement theme system with dark/light toggle and system preference detection #473
  Closes Implement comprehensive error handling with global error boundary and API recovery #474

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