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)/voice/view.tsx

@@ -40,7 +40,12 @@ export function VoiceView({
   initialGuilds?: Guild[];
 }) {
   const ws = useWebSocket();
-  const { data: status, isLoading, error } = useVoiceStatus(initialStatus);
+  const {
+    data: status,
+    isLoading,
+    error,
+    mutate,
+  } = useVoiceStatus(initialStatus);
   const connect = useVoiceConnect();
   const disconnect = useVoiceDisconnect();
   const mic = useMicTransmit(ws);
@@ -68,7 +73,8 @@ export function VoiceView({
     else ambient.set("vermilion", 0.35, "voice idle");
   }, [status?.connected, ambient]);
 
-  if (error && !status) return <ErrorState error={error} />;
+  if (error && !status)
+    return <ErrorState error={error} onRetry={() => void mutate()} />;
   if (!status && isLoading)
     return (
       <div className="space-y-5">