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/ProjectNodeSelector.tsx

@@ -0,0 +1,57 @@
+import { useMemo } from "react";
+import type { NodeInfo } from "../api";
+
+interface ProjectNodeSelectorProps {
+  projectId: string;
+  currentNodeId?: string;
+  onSelect: (nodeId: string | null) => void;
+  nodes: NodeInfo[];
+  disabled?: boolean;
+}
+
+const STATUS_DOT: Record<NodeInfo["status"], string> = {
+  online: "🟢",
+  offline: "🔴",
+  connecting: "🟡",
+  error: "🔴",
+};
+
+export function ProjectNodeSelector({
+  projectId,
+  currentNodeId,
+  onSelect,
+  nodes,
+  disabled = false,
+}: ProjectNodeSelectorProps) {
+  const sortedNodes = useMemo(() => {
+    return [...nodes].sort((a, b) => a.name.localeCompare(b.name));
+  }, [nodes]);
+
+  const selectedValue = currentNodeId ?? "";
+
+  return (
+    <label className="project-node-selector" htmlFor={`project-node-selector-${projectId}`}>
+      <span className="project-node-selector__label">Runtime Node</span>
+      <select
+        id={`project-node-selector-${projectId}`}
+        value={selectedValue}
+        onChange={(event) => {
+          const value = event.target.value;
+          onSelect(value ? value : null);
+        }}
+        disabled={disabled}
+      >
+        <option value="">Auto (no assignment)</option>
+        {sortedNodes.map((node) => (
+          <option
+            key={node.id}
+            value={node.id}
+            className={node.status === "offline" || node.status === "error" ? "project-node-selector__option--dim" : ""}
+          >
+            {STATUS_DOT[node.status]} {node.name} ({node.type})
+          </option>
+        ))}
+      </select>
+    </label>
+  );
+}