Release v0.4.0

feat: enhance task detail view and file handling

- Added styles for the task detail view, including header, summary, and context cards.
- Introduced syntax highlighting support for various programming languages using highlight.js.
- Removed unused ContextWindowInfo interface from shared types.
- Added TaskFileContent interface to manage task file details.
- Implemented tests for conversation provider selection, ensuring proper handling of task continuation and provider switching.
- Created tests for task file inspection, validating file loading and syntax mapping.
- Enhanced provider process adapter tests to handle intentional aborts correctly.