refactor(route-error-boundary): simplify error handling logic

[suleimanjem-hash]

Summary

Refactors RouteErrorBoundary.tsx by extracting complex logic into smaller, reusable helper functions to improve maintainability, readability, and testability.

Changes

• Broke down large functions into focused helper utilities.
• Simplified component control flow and error handling logic.
• Improved code organization and separation of concerns.
• Added unit tests covering expected behavior and edge cases.
• Removed any debug-only statements and ensured production readiness.
• Updated relevant documentation where applicable.

Testing

• Added unit tests for helper functions and error boundary behavior.
• Verified fallback rendering for different error scenarios.
• Confirmed existing test suite passes without regressions.

Acceptance Criteria

• Complex logic extracted into smaller, testable units.
• Automated tests cover expected behavior and edge cases.
• No debug-only code remains in production.
• Documentation updated where necessary.
• CI passes successfully.

Notes

• No user-facing functionality changes.
• Refactor focused on maintainability, reliability, and future extensibility.
  closes Refactor complex logic in src/components/error/RouteErrorBoundary.tsx #355

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[nanaf6203-bit]

LGTM