[eric] agents: mid-turn provider backoff shows a muted retrying pill instead of a dead card, and transient pills survive session status frames

frontend/src/shared/ws/WebSocketManager.ts

@@ -13,6 +13,7 @@ import {
   updateSessionContext,
   setContextOverflow,
   setRateLimited,
+  setProviderRetrying,
   setContextRecovered,
   setAppDepsChanged,
   setMcpSuggestions,
@@ -644,6 +645,17 @@ class WebSocketManager {
         }
         break;
 
+      case 'agent:provider_retrying':
+        // Mid-turn CLI backoff: the provider 500/429'd and the CLI is silently waiting; show the muted pill so the card doesn't read as dead (ENG-178).
+        if (session_id) {
+          store.dispatch(setProviderRetrying({
+            sessionId: session_id,
+            attempt: typeof data.attempt === 'number' ? data.attempt : null,
+            delayMs: typeof data.delay_ms === 'number' ? data.delay_ms : null,
+          }));
+        }
+        break;
+
       case 'agent:rate_limited':
         // Provider throttle that outlasted the silent backoff. Transient muted pill, not a card; auto-clears frontend-side.
         if (session_id) {