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/api/legacy.ts

@@ -325,6 +325,7 @@ export function batchUpdateTaskModels(
   validatorModelId?: string | null,
   planningModelProvider?: string | null,
   planningModelId?: string | null,
+  nodeId?: string | null,
   projectId?: string,
 ): Promise<{ updated: Task[]; count: number }> {
   return api<{ updated: Task[]; count: number }>(withProjectId("/tasks/batch-update-models", projectId), {
@@ -337,6 +338,7 @@ export function batchUpdateTaskModels(
       validatorModelId,
       planningModelProvider,
       planningModelId,
+      nodeId,
     }),
   });
 }