- Added `ActiveTab` enum to manage active tab state in `App`.
- Created `BatchItem` struct and integrated `batch_items` vector in `App`.
- Developed `BatchPanel` component for managing batch projects with inline forms.
- Implemented sequential processing in `App::start_batch_item()` with automatic advancement in `poll_background()`.
- Updated UI to display individual item states (`⏳ Aguardando | ⟳ Processando | ✓ Concluído | ⊸ Cancelado | ✗ Erro`).
- Blocked item addition/removal during processing.
- Enhanced session persistence to include batch projects in `SessionData`.
- Updated session save/load functions to handle new session structure.
Felipe