fix: prevent false empty states during stack hydration (#1659)

* fix: prevent false empty states during stack hydration

Only show confirmed-empty UI after successful stack, status, and container
fetches. Distinguish loading and recoverable error states in the sidebar,
dashboard, and container health panel.

* fix: arbitrate overlapping stack status and container fetches

Prevent older dashboard status and same-owner container responses from overwriting newer load state after concurrent poll, invalidation, retry, or lifecycle refresh.

* fix: do not let soft status polls starve slow foreground loads

Skip soft /stacks/statuses poll and invalidation while a statuses request is already in flight so a deferred foreground hydration can still commit after the ten-second cadence.

* fix(stacks): surface recoverable errors for confirmed-empty soft failures

Sidebar and dashboard soft (background) refresh failures after a
confirmed-empty state silently kept showing the empty/adopt prompt
instead of a recoverable error, since only the error message was set
without flipping the load status. Also reject malformed non-array
/stacks responses instead of coercing them into a confirmed-empty list,
and drop malformed per-stack status entries before they reach the
dashboard table, which previously crashed the entire app on a null
entry.

* fix(stacks): close two review-found gaps in the load-failure fix

A non-empty stack-statuses map where every entry failed validation was
still committed as a confirmed-empty success; it now surfaces as a
recoverable error instead, and dropped entries are logged. The sidebar's
background-failure helper also checked a stale closure snapshot of the
file list, which could wipe a list that had just loaded non-empty in the
same attempt if the follow-up statuses fetch then failed; it now tracks
the freshest committed list for that decision. Also collapses two refs
tracking dashboard status-map emptiness into one.

frontend/src/components/EditorLayout/EditorView.tsx

@@ -135,6 +135,9 @@ export interface EditorViewProps {
     envFiles: string[];
     selectedEnvFile: string;
     isFileLoading: boolean;
+    containersLoadStatus?: 'idle' | 'loading' | 'success' | 'error';
+    containersLoadError?: string | null;
+    onRetryContainersLoad?: () => void;
     backupInfo: { exists: boolean; timestamp: number | null };
     gitSourcePendingMap: Record<string, boolean>;
     notifications: NotificationItem[];
@@ -244,6 +247,9 @@ export function EditorView(props: EditorViewProps) {
         envFiles,
         selectedEnvFile,
         isFileLoading,
+        containersLoadStatus = 'success',
+        containersLoadError = null,
+        onRetryContainersLoad,
         backupInfo,
         gitSourcePendingMap,
         notifications,
@@ -475,6 +481,9 @@ export function EditorView(props: EditorViewProps) {
                                     onRequestServiceUpdate={onRequestServiceUpdate}
                                     containersExpanded={containersExpanded}
                                     onToggleContainersExpand={toggleContainersExpand}
+                                    containersLoadStatus={containersLoadStatus}
+                                    containersLoadError={containersLoadError}
+                                    onRetryContainersLoad={onRetryContainersLoad}
                                     key={`${activeNode?.id ?? 'local'}:${stackName}`}
                                 />
                             </ScrollArea>
@@ -494,6 +503,9 @@ export function EditorView(props: EditorViewProps) {
                                 serviceUpdateStatuses={serviceUpdateStatuses}
                                 serviceUpdateInProgress={serviceUpdateInProgress}
                                 onRequestServiceUpdate={onRequestServiceUpdate}
+                                containersLoadStatus={containersLoadStatus}
+                                containersLoadError={containersLoadError}
+                                onRetryContainersLoad={onRetryContainersLoad}
                                 key={`${activeNode?.id ?? 'local'}:${stackName}`}
                             />
                         </CardContent>