feat(FN-2721): enforce node override guard across task workflows

- Add a core node-override-guard module, export it from @fusion/core, and enforce conflicts in store updates
- Add API route and CLI extension safeguards so nodeId override updates are blocked when ownership would conflict
- Wire node override routing and validation through dashboard quick-create, list, modal, settings, and task form/detail surfaces
- Add focused unit and integration tests for core guard logic, workflow routes, and dashboard node override UX

packages/dashboard/app/components/InlineCreateCard.css

@@ -215,6 +215,15 @@
   align-items: center;
 }
 
+.inline-create-node-wrap {
+  display: inline-flex;
+  align-items: center;
+}
+
+.inline-create-node-select {
+  max-width: 250px;
+}
+
 .inline-create-priority-select {
   max-width: 180px;
 }