feat(fe): optimize error handling, state consistency, and WS feedback

- Add global SWR config with exponential backoff retry (swr-config.ts)
- Add ErrorBoundary component for React crash recovery (error-boundary.tsx)
- Standardize ErrorState onRetry on all 6 dashboard views (dashboard, media,
  messages, moderation, recordings, voice)
- Fix useAction: expose resetError + onError callback
- Refactor useSpeakers to SWR-backed state (was local useState) for
  consistent cache/revalidate semantics with other hooks
- Remove polling in useReview (15s refreshInterval); replace with
  useReviewWsSync subscribing to WS moderation_action events
- Extract hashUserId to lib/hash.ts (de-dup with ambient-canvas)
- WS context: add reconnect/error toast feedback via onStatusChange
- WS connection: expose reconnectAttemptCount getter

All typecheck + lint clean, Next 16 build passes.

services/frontend/src/app/(dashboard)/media/view.tsx

@@ -33,7 +33,12 @@ import { useWebSocket } from "@/lib/ws/context";
 
 export function MediaView({ initialStatus }: { initialStatus?: MediaState }) {
   const ws = useWebSocket();
-  const { data: media, isLoading, error } = useMediaState(initialStatus);
+  const {
+    data: media,
+    isLoading,
+    error,
+    mutate,
+  } = useMediaState(initialStatus);
   const queue = useMediaQueue();
   const skip = useMediaSkip();
   const stop = useMediaStop();
@@ -79,7 +84,8 @@ export function MediaView({ initialStatus }: { initialStatus?: MediaState }) {
     }
   };
 
-  if (error && !media) return <ErrorState error={error} />;
+  if (error && !media)
+    return <ErrorState error={error} onRetry={() => void mutate()} />;
   if (!media && isLoading)
     return (
       <div className="space-y-5">