feat: add confirmed Take down stack action with optional volume removal (#1599)

* feat: add confirmed Take down stack action with optional volume removal

Expose Take down in the stack header and sidebar with a confirmation dialog
that runs compose down while keeping the stack definition on disk. Optional
volume removal is gated by node capability and stack:deploy permission, with
remote gateway preflight before proxying removeVolumes requests.

Closes #1582

* fix: reset take-down volume checkbox when dialog closes

* test: align getStackMenuVisibility assertions with showTakeDown key

getStackMenuVisibility now returns a fifth lifecycle flag, showTakeDown,
but three exhaustive toEqual assertions still listed only the prior four
keys and failed. Add the expected showTakeDown value to each: true for
the partial and exited running-stack cases, false for the self stack.

* test: cover Take down visibility for running non-self stacks

The getStackMenuVisibility assertions exercised the partial and exited
branches and the self-stack guard, but not the raw === 'running' literal
that drives showTakeDown for a normal running stack. Add a case so a
regression dropping 'running' from that check is caught.

* fix: drop Take down from header overflow and wire activity shortcut

Remove duplicate Take down from More actions.

Keep inline button when running, sidebar menu, and Cmd+ArrowDown.

Record stack_taken_down in activity on successful POST /down.

frontend/src/components/EditorLayout.tsx

@@ -30,6 +30,7 @@ import {
 import { SENCHO_OPEN_LOGS_EVENT, SENCHO_OPEN_STACK_EVENT } from '@/lib/events';
 import type { SenchoOpenLogsDetail, SenchoOpenStackDetail } from '@/lib/events';
 import { useNodes } from '@/context/NodeContext';
+import { STACK_DOWN_REMOVE_VOLUMES_CAPABILITY } from '@/lib/capabilities';
 import { useAuth } from '@/context/AuthContext';
 import { useDeployFeedback } from '@/context/DeployFeedbackContext';
 import { useTrivyStatus } from '@/hooks/useTrivyStatus';
@@ -145,7 +146,9 @@ export default function EditorLayout() {
     stacksLoadNodeId,
   } = stackListState;
 
-  const { nodes, activeNode, setActiveNode, hasCapability, isLoading: nodesLoading } = useNodes();
+  const { nodes, activeNode, setActiveNode, hasCapability, activeNodeMeta, isLoading: nodesLoading } = useNodes();
+  const canOfferVolumeRemoval =
+    activeNodeMeta?.capabilities.includes(STACK_DOWN_REMOVE_VOLUMES_CAPABILITY) === true;
 
   // Mirror activeNode.id in a ref so async handlers (e.g. CreateStackDialog's
   // post-create handoff) can detect a node switch that happened mid-flight.
@@ -230,6 +233,7 @@ export default function EditorLayout() {
     getLastDeployOutputLine,
     diffPreviewEnabled,
     hasUpdateGuard: hasCapability('update-guard'),
+    canOfferVolumeRemoval,
   });
 
   // Wire the ref now that stackActions is available
@@ -554,6 +558,8 @@ export default function EditorLayout() {
       setEditingCompose={setEditingCompose}
       setGitSourceOpen={setGitSourceOpen}
       requestDeleteStack={stackActions.requestDeleteStack}
+      requestTakeDownStack={stackActions.requestTakeDownStack}
+      showTakeDown={selectedFile ? stackActions.getStackMenuVisibility(selectedFile).showTakeDown : false}
       isSelfStack={selectedFile ? stackSelfFlags[selectedFile] === true : false}
       recoveryResult={selectedFile ? lastActionResult[selectedFile] : undefined}
       onRefreshState={async () => {
@@ -863,6 +869,7 @@ export default function EditorLayout() {
           gitSourceOpen={gitSourceOpen}
           setGitSourceOpen={setGitSourceOpen}
           canSelfUpdate={hasCapability('self-update')}
+          canOfferVolumeRemoval={canOfferVolumeRemoval}
           onOpenFleetNodeUpdates={() => {
             if (isMobile) {
               navigateMobileAware('fleet');