don't hide tasks if streams fail (#2053)

frontend/src/hooks/useJsonPatchWsStream.ts

@@ -193,9 +193,8 @@ export const useJsonPatchWsStream = <T extends object>(
         retryTimerRef.current = null;
       }
       finishedRef.current = false;
-      dataRef.current = undefined;
-      setData(undefined);
-      setIsInitialized(false);
+      // Preserve data during reconnection attempts - only clear on unmount/disable
+      // Data will be refreshed when the new connection receives its initial snapshot
     };
   }, [
     endpoint,
@@ -206,5 +205,14 @@ export const useJsonPatchWsStream = <T extends object>(
     retryNonce,
   ]);
 
+  // Clear data when the stream is disabled (separate effect to avoid clearing on reconnect)
+  useEffect(() => {
+    if (!enabled) {
+      dataRef.current = undefined;
+      setData(undefined);
+      setIsInitialized(false);
+    }
+  }, [enabled]);
+
   return { data, isConnected, isInitialized, error };
 };

frontend/src/pages/ProjectTasks.tsx

@@ -152,6 +152,7 @@ export function ProjectTasks() {
 
   const {
     projectId,
+    project,
     isLoading: projectLoading,
     error: projectError,
   } = useProject();
@@ -845,7 +846,8 @@ export function ProjectTasks() {
 
   const isInitialTasksLoad = isLoading && tasks.length === 0;
 
-  if (projectError) {
+  // Only show full-page error if we have no project data at all
+  if (projectError && !project) {
     return (
       <div className="p-4">
         <Alert>
@@ -1085,15 +1087,18 @@ export function ProjectTasks() {
     </GitOperationsProvider>
   );
 
+  const connectionError =
+    streamError || (projectError && project ? projectError.message : null);
+
   return (
     <div className="h-full flex flex-col">
-      {streamError && (
+      {connectionError && (
         <Alert className="w-full z-30 xl:sticky xl:top-0">
           <AlertTitle className="flex items-center gap-2">
             <AlertTriangle size="16" />
             {t('common:states.reconnecting')}
           </AlertTitle>
-          <AlertDescription>{streamError}</AlertDescription>
+          <AlertDescription>{connectionError}</AlertDescription>
         </Alert>
       )}