fix(ui): exit infinite spinner with a retry card on failed initial load

List pages wrapped content in <Spin spinning={!fetched}> where 'fetched' only flipped true once data arrived. With staleTime: Infinity + retry: 1, a transient network error on first load left the query in a permanent error state and the spinner stuck forever.

Now 'fetched' also settles on query.isError, and a failed load shows a Result error card with a Refresh button that self-heals when the backend returns, mirroring the existing XrayPage pattern. Applied to clients, inbounds, groups, nodes, and the dashboard.

Fixes #4723

frontend/src/api/queries/useNodesQuery.ts

@@ -76,6 +76,8 @@ export function useNodesQuery() {
     nodes,
     totals,
     loading: query.isFetching,
-    fetched: query.data !== undefined,
+    fetched: query.data !== undefined || query.isError,
+    fetchError: query.error ? (query.error as Error).message : '',
+    refetch: query.refetch,
   };
 }

frontend/src/api/queries/useStatusQuery.ts

@@ -30,7 +30,8 @@ export function useStatusQuery() {
 
   return {
     status,
-    fetched: query.data !== undefined,
+    fetched: query.data !== undefined || query.isError,
+    fetchError: query.error ? (query.error as Error).message : '',
     refresh,
   };
 }