## What
This PR targets #402 and refactors the `history-overlay.tsx`component to
reduce cognitive complexity by splitting the `buildLists` function into
smaller, focused helper functions. It also adds comprehensive test
coverage to ensure the functionality remains intact.
## Why
The original `buildLists` function had high cognitive complexity due to
multiple nested conditionals, complex string manipulation, and mixed
responsibilities. This refactor makes the code more maintainable and
easier to understand while preserving all existing functionality.
## How
- Split `buildLists` into focused helper functions
- Added comprehensive test coverage for all functionality
- Maintained existing behavior and keyboard interactions
- Improved code organization and readability
## Testing
All tests pass, including:
- Command mode functionality
- File mode functionality
- Keyboard interactions
- Error handling
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