- Multiline input support with Shift+Enter for new lines
- Auto-height adjustment and line navigation
- Syntax highlighting in DiffView for added lines
- Language detection from file extensions
- Config options for multiline and syntaxHighlight
- New EditableContent component for inline editing
- ConfirmDialog supports [E] to edit proposed changes
- ExecuteTool handles edited content from user
- ConfirmationResult type with editedContent field
- App.tsx implements Promise-based confirmation flow
- All 1484 tests passing, 0 ESLint errors
