feat(FN-1081): add dashboard nodes management workflow

- Add node API typings and client methods plus a polling useNodes hook with visibility-triggered refresh
- Introduce NodesView with NodeCard, AddNodeModal, and NodeDetailModal to register, inspect, update, health-check, and remove nodes
- Wire the Nodes surface into the app shell/header and add project node assignment UI with project card node badges
- Add unit coverage for useNodes, NodesView, NodeCard, Header, and ProjectCard behavior, plus node-specific dashboard styling

packages/dashboard/app/components/__tests__/ProjectCard.test.tsx

@@ -2,6 +2,7 @@ import { describe, it, expect, vi } from "vitest";
 import { render, screen, fireEvent } from "@testing-library/react";
 import { ProjectCard } from "../ProjectCard";
 import type { RegisteredProject, ProjectHealth } from "@fusion/core";
+import type { NodeInfo } from "../../api";
 
 // Mock lucide-react to avoid SVG rendering issues in test env
 vi.mock("lucide-react", () => ({
@@ -41,6 +42,19 @@ function makeHealth(overrides: Partial<ProjectHealth> = {}): ProjectHealth {
   };
 }
 
+function makeNode(overrides: Partial<NodeInfo> = {}): NodeInfo {
+  return {
+    id: "node_001",
+    name: "Build Node",
+    type: "local",
+    status: "online",
+    maxConcurrent: 2,
+    createdAt: "2026-01-01T00:00:00.000Z",
+    updatedAt: "2026-01-01T00:00:00.000Z",
+    ...overrides,
+  };
+}
+
 const noop = () => {};
 
 describe("ProjectCard", () => {
@@ -60,6 +74,22 @@ describe("ProjectCard", () => {
     expect(screen.getByText("/path/to/project")).toBeDefined();
   });
 
+  it("renders assigned node badge when node is provided", () => {
+    render(
+      <ProjectCard
+        project={makeProject()}
+        health={makeHealth()}
+        node={makeNode({ name: "Remote Worker" })}
+        onSelect={noop}
+        onPause={noop}
+        onResume={noop}
+        onRemove={noop}
+      />
+    );
+
+    expect(screen.getByText("on: Remote Worker")).toBeDefined();
+  });
+
   it("truncates long paths", () => {
     const longPath = "/very/long/path/to/the/project/directory/that/needs/truncation";
     render(