feat(FN-2726): add bulk node override support in dashboard workflows

- Extend batch task update APIs and route handlers to accept nodeId overrides alongside model settings
- Update ListView bulk edit UX to load nodes and apply node overrides through batch updates
- Add node routing visibility improvements in task detail/settings UI and align related labels/styles
- Expand dashboard/API test coverage for node override batch updates and bulk edit behavior

packages/dashboard/app/components/ListView.css

@@ -79,45 +79,22 @@
   min-width: 180px;
 }
 
-.bulk-edit-node-wrap {
-  display: inline-flex;
-  align-items: center;
-  gap: var(--space-sm);
-}
-
-.list-view-node-status {
-  display: inline-flex;
-  align-items: center;
-  gap: var(--space-xs);
-  font-size: 12px;
-  color: var(--text-muted);
-}
-
-.list-view-node-status__dot {
-  width: var(--space-sm);
-  height: var(--space-sm);
-  border-radius: var(--radius-pill);
-  background: var(--color-muted);
-}
-
-.list-view-node-status--online .list-view-node-status__dot {
-  background: var(--color-success);
-}
-
-.list-view-node-status--offline .list-view-node-status__dot,
-.list-view-node-status--error .list-view-node-status__dot {
-  background: var(--color-error);
-}
-
-.list-view-node-status--connecting .list-view-node-status__dot {
-  background: var(--color-warning);
-}
 
 .bulk-edit-dropdown .model-combobox-trigger {
   font-size: 12px;
   padding: 6px 10px;
 }
 
+.bulk-node-select {
+  width: 100%;
+  min-height: 30px;
+  font-size: 12px;
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  background: var(--surface);
+  border: 1px solid var(--border);
+}
+
 .bulk-edit-apply-btn {
   white-space: nowrap;
 }
@@ -918,6 +895,10 @@
     flex: 1;
   }
 
+  .bulk-node-select {
+    min-height: 36px;
+  }
+
   /* List column dropdown items: touch target on mobile */
   .list-column-dropdown-item {
     min-height: 36px;