feat(arena): Add agent collaboration arena feature

Introduces a new Arena system for running multiple AI agents in parallel
terminal sessions with support for iTerm and Tmux backends.

Core:
- Add ArenaManager and ArenaAgentClient for orchestrating multi-agent sessions
- Add terminal backends (ITermBackend, TmuxBackend) with feature detection
- Add git worktree service for isolated agent workspaces
- Add arena event system for real-time status updates

CLI:
- Add /arena command with start, stop, status, and select subcommands
- Add Arena dialogs (Select, Start, Status, Stop)
- Add ArenaCards component for displaying parallel agent outputs
- Consolidate message components into StatusMessages and ConversationMessages
- Add MultiSelect component for agent selection

Config:
- Add arena-related settings to schema and config

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/ui/components/shared/DescriptiveRadioButtonSelect.tsx

@@ -12,7 +12,7 @@ import type { SelectionListItem } from '../../hooks/useSelectionList.js';
 
 export interface DescriptiveRadioSelectItem<T> extends SelectionListItem<T> {
   title: React.ReactNode;
-  description: string;
+  description: React.ReactNode;
 }
 
 export interface DescriptiveRadioButtonSelectProps<T> {
@@ -62,7 +62,11 @@ export function DescriptiveRadioButtonSelect<T>({
       renderItem={(item, { titleColor }) => (
         <Box flexDirection="column" key={item.key}>
           <Text color={titleColor}>{item.title}</Text>
-          <Text color={theme.text.secondary}>{item.description}</Text>
+          {typeof item.description === 'string' ? (
+            <Text color={theme.text.secondary}>{item.description}</Text>
+          ) : (
+            item.description
+          )}
         </Box>
       )}
     />