refactor(AppBloc): improve data loading and state transition logic

- Optimize user change handling to prevent redundant reloads
- Enhance state transitions with clearer status mappings
- Concurrently fetch remote config and user settings for performance
- Implement critical status evaluation (maintenance, update required)
- Refactor settings update logic with proper error handling and persistence
- Simplify font family mapping and remove unused fontWeight logic
- Improve error handling and logging during data fetching
- Update method comments for clearer understanding of logic flow

Author: fulleni