fix(ui): push log sort toggle server-side

Reversing logStream.items client-side breaks across infinite-scroll
pages. Passing sort='asc'/'desc' into the query key and URL triggers
a fresh first-page fetch in the selected order.

ui/src/api/queries/logs.ts

@@ -165,6 +165,7 @@ export interface UseInfiniteApplicationLogsArgs {
   sources?: string[];   // multi-select, server-side OR
   levels?: string[];    // multi-select, server-side OR
   exchangeId?: string;
+  sort?: 'asc' | 'desc';
   isAtTop: boolean;
   pageSize?: number;
 }
@@ -189,6 +190,7 @@ export function useInfiniteApplicationLogs(
   const sourcesParam = sortedSources.join(',');
   const levelsParam = sortedLevels.join(',');
   const pageSize = args.pageSize ?? 100;
+  const sort = args.sort ?? 'desc';
 
   return useInfiniteStream<LogEntryResponse>({
     queryKey: [
@@ -202,6 +204,7 @@ export function useInfiniteApplicationLogs(
       fromIso ?? '',
       toIso ?? '',
       pageSize,
+      sort,
     ],
     enabled: !!args.application && !!selectedEnv,
     isAtTop: args.isAtTop,
@@ -217,7 +220,7 @@ export function useInfiniteApplicationLogs(
       if (toIso) qp.set('to', toIso);
       if (cursor) qp.set('cursor', cursor);
       qp.set('limit', String(pageSize));
-      qp.set('sort', 'desc');
+      qp.set('sort', sort);
 
       const res = await fetch(
         `${config.apiBaseUrl}/environments/${encodeURIComponent(selectedEnv ?? '')}/logs?${qp}`,

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -312,17 +312,17 @@ export default function AgentHealth() {
     application: appId,
     sources: [...logSources],
     levels: [...logLevels],
+    sort: logSortAsc ? 'asc' : 'desc',
     isAtTop: isLogAtTop,
   });
   const logEntries = useMemo<LogEntry[]>(() => {
-    const mapped = logStream.items.map((l) => ({
+    return logStream.items.map((l) => ({
       timestamp: l.timestamp ?? '',
       level: mapLogLevel(l.level),
       message: l.message ?? '',
       source: l.source ?? undefined,
     }));
-    return logSortAsc ? mapped.toReversed() : mapped;
-  }, [logStream.items, logSortAsc]);
+  }, [logStream.items]);
   const logSearchLower = logSearch.toLowerCase();
   const filteredLogs = logSearchLower
     ? logEntries.filter((l) => l.message.toLowerCase().includes(logSearchLower))

ui/src/pages/AgentInstance/AgentInstance.tsx

@@ -141,17 +141,17 @@ export default function AgentInstance() {
     agentId: instanceId,
     sources: [...logSources],
     levels: [...logLevels],
+    sort: logSortAsc ? 'asc' : 'desc',
     isAtTop: isLogAtTop,
   });
   const logEntries = useMemo<LogEntry[]>(() => {
-    const mapped = logStream.items.map((l) => ({
+    return logStream.items.map((l) => ({
       timestamp: l.timestamp ?? '',
       level: mapLogLevel(l.level),
       message: l.message ?? '',
       source: l.source ?? undefined,
     }));
-    return logSortAsc ? mapped.toReversed() : mapped;
-  }, [logStream.items, logSortAsc]);
+  }, [logStream.items]);
   const searchLower = logSearch.toLowerCase();
   const filteredLogs = searchLower
     ? logEntries.filter((l) => l.message.toLowerCase().includes(searchLower))