- Removed unused imports, including `Element`, `Node`, and `ActiveCell` struct.
- Consolidated signal management for `active_cell_position` and `active_row_index`.
- Improved focus handling by adding a reusable `handle_focus` function.
- Optimized EditableCell's event handlers for better maintainability.
- Introduced `is_disposed` signal to track component disposal state.
- Added `on_cleanup` hook to set disposal flag and log when the component is disposed.
- Enhanced signal access with `log_signal_get` to prevent usage after disposal.
- Improved input, focus, and blur handlers to respect disposal state.
- Ensured robust handling of signals during the component's lifecycle.
This improves resilience and debugging for EditableCell, especially in dynamic UI contexts.
