Preserve loaded logs across same-server fleet updates

src/lib/ui/log-refresh.ts

@@ -14,6 +14,7 @@ export interface LogResponse {
 
 interface Selection { server: string; key: string; lines: number }
 interface Options {
+    onReset: () => void;
     onData: (key: string, response: LogResponse) => void;
     onError: (message: string) => void;
     onLoading: (loading: boolean) => void;
@@ -73,6 +74,9 @@ export function createLogRefresh(options: Options) {
         automatic = enabled;
         interval = pollMs;
         if (changed || pausing) cancel();
+        // Fleet updates can replace the parent server object without changing
+        // this identity. Only navigation to a different server invalidates logs.
+        if (selection?.server !== target.server) options.onReset();
         if (changed) { selection = target; options.onError(''); }
         if (!selection?.key) return;
         if (automatic) stopPolling = pollVisible(refresh, interval);