- Change HandleSubscribers call to ignore return value with blank identifier
- Return explicit error for unknown command instead of propagating HandleSubscribers result
- Improve error clarity by returning formatted error message
- Update HandleBilling to accept CLIConfig, return error, and use uiContext for all output
- Update HandleConfig to accept CLIConfig, return error, and use uiContext for all output
- Replace manual colorizer/icon initialization with uiContext helper methods
- Simplify error handling with uiContext.errorln, warn, success, info, muted methods
- Replace direct table creation with uiContext.newTable()