fix: address PR review — bugs, dead code, error handling

Critical fixes:
- Smart Home: invalidate entity state query after toggle mutation
- Beszel live mode: use 5s refetchInterval instead of global 30s
- Fix unit test assertions for 5-arg setQueryCacheAsync signature
- Fix serialize/deserialize mismatch: JSON.parse on read (matches persister's JSON.stringify)
- Remove render-time setActiveQueryCacheBoardId race (keep only useEffect)

Error handling:
- Log persistence errors instead of swallowing with catch(() => {})
- Log QueryCacheHydration failures with ErrorWithMetadata
- Beszel: log partial failures (system details, container stats)

Dead code removal:
- Remove dead queryKey from all 39 request handlers + lib files
- Delete unused Redis APIs: createCacheChannel, createChannelWithLatestAndEvents,
  createChannelEventHistory, history-channel.ts
- Remove stale createCacheChannel mock from docker test

Cleanup:
- Seed system-resources chart from initial query data (no empty start)
- Remove redundant refetchOnWindowFocus/refetchOnReconnect from BoardProvider

packages/widgets/src/beszel/_shared/use-live-stats.ts

@@ -1,24 +1,13 @@
 "use client";
 
-import { useMemo } from "react";
-
 import { clientApi } from "@homarr/api/client";
 
 export const useLiveStats = (integrationIds: string[], systemId: string, enabled: boolean) => {
-  const queryInput = useMemo(
-    () => ({
-      integrationIds,
-      systemId,
-      timePeriod: "1m" as const,
-      includeDocker: true,
-    }),
-    [integrationIds, systemId],
+  const { data, error } = clientApi.widget.beszel.getSystemStats.useQuery(
+    { integrationIds, systemId, timePeriod: "1m" as const, includeDocker: true },
+    { enabled: enabled && systemId !== "", refetchInterval: 5_000 },
   );
 
-  const { data, error } = clientApi.widget.beszel.getSystemStats.useQuery(queryInput, {
-    enabled: enabled && systemId !== "",
-  });
-
   return {
     data: data ? { systemStats: data.systemStats, containerStats: data.containerStats } : null,
     error: error ?? (data?.error ? new Error(data.error) : null),

packages/widgets/src/smart-home/entity-state/component.tsx

@@ -25,7 +25,10 @@ export default function SmartHomeEntityStateWidget({
   };
   const { data: entityState } = clientApi.widget.smartHome.entityState.useQuery(input);
 
-  const { mutate } = clientApi.widget.smartHome.switchEntity.useMutation();
+  const utils = clientApi.useUtils();
+  const { mutate } = clientApi.widget.smartHome.switchEntity.useMutation({
+    onSettled: () => void utils.widget.smartHome.entityState.invalidate(input),
+  });
 
   const attribute = options.entityUnit.length > 0 ? " " + options.entityUnit : "";
 

packages/widgets/src/system-resources/component.tsx

@@ -41,7 +41,7 @@ export default function SystemResources({ integrationIds, options }: WidgetCompo
 
   const [items, setItems] = useState<
     { cpu: number; memory: number; gpu: number; network: { up: number; down: number } | null }[]
-  >([]);
+  >(() => (data[0] ? [toChartItem(data[0].healthInfo)] : []));
 
   useEffect(() => {
     const firstItem = data[0];