fix(frontend): always refetch knowledgeDocuments on provider remount

The Apollo client's global nextFetchPolicy is 'cache-first', so returning
to /knowledges via SPA navigation would serve potentially stale cache.
Subscriptions are now scoped to /knowledges* and detach on other pages,
so changes from AI agents during flow runs would be missed until a full
reload. Override nextFetchPolicy to keep cache-and-network for this query.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/providers/knowledges-provider.tsx

@@ -46,8 +46,13 @@ export const KnowledgesProvider = ({ children }: KnowledgesProviderProps) => {
 
     const shouldFetch = Boolean(authInfo && authInfo.type !== 'guest' && isAuthenticated());
 
+    // Override the client's default `nextFetchPolicy: 'cache-first'`: since
+    // subscriptions are scoped to this provider, the cache can drift while the
+    // user is on other pages (AI agents write documents during flow runs).
+    // Re-mounting the provider on return to /knowledges should refresh.
     const { data, loading: isLoading } = useKnowledgeDocumentsQuery({
         fetchPolicy: 'cache-and-network',
+        nextFetchPolicy: 'cache-and-network',
         skip: !shouldFetch,
         variables: { withContent: true },
     });