feat(FN-2727): add node routing controls to CLI and dashboard

- Add CLI support for task node routing with create --node, task set-node, and task clear-node commands
- Extend settings command validation/output for defaultNodeId and unavailableNodePolicy and document new keys
- Surface task routing details in CLI task show plus dashboard Routing tab status/binding reason indicators
- Enhance Settings modal node routing UX with selected-node health status and add/refresh tests and changeset

packages/dashboard/app/components/RoutingTab.css

@@ -50,10 +50,13 @@
 }
 
 .routing-summary-value {
-  display: inline-flex;
+  display: flex;
+  flex-wrap: wrap;
+  min-width: 0;
   align-items: center;
   gap: var(--space-sm);
   color: var(--text);
+  overflow-wrap: anywhere;
 }
 
 .routing-summary-warning {
@@ -65,6 +68,49 @@
   color: var(--color-warning);
 }
 
+.routing-node-status {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-xs);
+  color: var(--text-muted);
+}
+
+.routing-node-status__dot {
+  width: var(--space-sm);
+  height: var(--space-sm);
+  border-radius: 50%;
+  background: var(--text-dim);
+}
+
+.routing-node-status--online .routing-node-status__dot {
+  background: var(--color-success);
+}
+
+.routing-node-status--offline .routing-node-status__dot,
+.routing-node-status--error .routing-node-status__dot {
+  background: var(--color-error);
+}
+
+.routing-node-status--connecting .routing-node-status__dot {
+  background: var(--color-warning);
+}
+
+.routing-node-status--error {
+  color: var(--color-error);
+}
+
+.routing-node-status--connecting {
+  color: var(--color-warning);
+}
+
+.routing-node-status--online {
+  color: var(--color-success);
+}
+
+.routing-node-status--offline {
+  color: var(--text-muted);
+}
+
 .routing-tab__info-banner,
 .routing-tab__warning-banner,
 .routing-tab__error {