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)/messages/view.tsx

@@ -39,6 +39,7 @@ import {
   useMessagesStream,
   useMessagesWsSync,
   useRecentEdits,
+  useReviewWsSync,
   useSemanticSearch,
 } from "@/hooks";
 import { aiTone } from "@/lib/ai-status";
@@ -94,6 +95,7 @@ export function MessagesView({
     data: messages,
     isLoading,
     error,
+    refetch,
   } = useMessages(
     guildId ?? "",
     channelId ?? undefined,
@@ -112,6 +114,7 @@ export function MessagesView({
   const hasMore = pageInfo?.hasMore ?? false;
   const loadMore = useLoadMore();
   useMessagesWsSync(ws, guildId ?? "");
+  useReviewWsSync(ws);
   const search = useMessageSearch(
     query,
     query.trim().length >= 2 && !semanticMode,
@@ -326,7 +329,7 @@ export function MessagesView({
             }
           />
           {error && !messages ? (
-            <ErrorState error={error} />
+            <ErrorState error={error} onRetry={() => refetch()} />
           ) : isLoading && !messages ? (
             <SkeletonRows rows={8} />
           ) : list.length === 0 ? (