- Add clickable artifact cards with keyboard support
- Create new ArtifactView for displaying file diffs
- Update button styles with solid backgrounds and faster transitions
- Add auto-cleanup of stale diff and plan approval views on startup
- Fix artifact deletion to preserve original file path
- Add fade gradient to artifacts list that hides when scrolled to bottom
- Update plan area fades to use scroll position instead of always showing
- Add hover effect to artifact cards with glowing ellipse indicator
- Fix indentation in UserMessage attachment styles
Extract user and assistant message rendering logic from ChatArea into dedicated UserMessage and AssistantMessage components, removing unused dependencies and styles.
