refactor(arena): move arena-bridge to context and add reactive manager tracking

- Move useArenaInProcess from AppContainer to AgentViewProvider
- Replace polling with config.onArenaManagerChange() callback
- Add success-type progress messages when agents finish tasks
- Add isSuccessStatus helper for IDLE/COMPLETED status checks
- Reset input history position when arena session starts

This improves separation of concerns and eliminates the 500ms polling
interval in favor of immediate reactive updates when the arena manager
changes.

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

packages/cli/src/gemini.tsx

@@ -163,7 +163,7 @@ export async function startInteractiveUI(
         >
           <SessionStatsProvider sessionId={config.getSessionId()}>
             <VimModeProvider settings={settings}>
-              <AgentViewProvider>
+              <AgentViewProvider config={config}>
                 <AppContainer
                   config={config}
                   settings={settings}