feat(sidebar): surface partial status for multi-container stacks (#1426)

Bulk stack-status aggregation collapsed a stack to "running" as soon as any
container was up, so a multi-container stack with crashed containers showed a
green UP pill and the degradation was invisible from the sidebar.

Add a crash-aware "partial" state: a stack is partial when at least one
container is running and at least one has genuinely failed (exited with a
non-zero code, dead, or crash-looping). Cleanly finished one-shot containers
(exit 0) and clean restart-policy cycling do not count, so an app with a
completed init job stays UP. The exit code is read from the container Status
string, so no extra inspect calls are needed.

Render partial as an amber PT pill with a hover tooltip showing the
running/total count, fold it into the Down filter (needs-attention), and treat
it as running for context-menu lifecycle actions so operators keep
stop/restart/update. The dashboard stack-health table, cross-node search rows,
and the command palette all pick up the new state through the shared status
surfaces.

frontend/src/components/EditorLayout/hooks/useSidebarContextMenu.ts

@@ -36,8 +36,12 @@ export function useSidebarContextMenu({
   const buildMenuCtx = useCallback((file: string): StackMenuCtx => {
     const sName = file.replace(/\.(yml|yaml)$/, '');
     const mainPort = stackListState.stackPorts[file];
+    // A partial stack has running containers, so it gets the running-stack
+    // lifecycle affordances; the menu's status union stays three-state.
+    const rawStatus = stackListState.stackStatuses[file] ?? 'unknown';
+    const stackStatus = rawStatus === 'partial' ? 'running' : rawStatus;
     return {
-      stackStatus: (stackListState.stackStatuses[file] ?? 'unknown') as 'running' | 'exited' | 'unknown',
+      stackStatus,
       // Only offer "Open App" when a browser-reachable URL can actually be built
       // (a remote node with no API host, e.g. a pilot agent, yields none).
       canOpenApp: mainPort !== undefined && buildServiceUrl({ node: activeNode, publicPort: mainPort }) !== null,