feat(FN-1232): add remote node mesh dashboard integration

- Add core proxy API infrastructure (api-node.ts) with remote node communication
- Create NodeContext for centralized node state management
- Implement useNodeProxy hook for node operations (metrics, events, health)
- Implement useRemoteNodeData hook with 10-second polling for live metrics
- Implement useRemoteNodeEvents hook for real-time SSE event subscription
- Add NodeStatusIndicator component with animated status indicators
- Add comprehensive tests for all new hooks and components
- Update dashboard styles for node status visualization

packages/dashboard/app/api-node.ts

@@ -0,0 +1,40 @@
+/**
+ * Remote Node API functions for fetching data from remote nodes via the proxy.
+ * All functions route through /api/proxy/:nodeId/... when a remote node is targeted.
+ */
+
+import type { ProjectInfo } from "./api";
+import type { ProjectHealth, Task } from "@fusion/core";
+import { proxyApi } from "./api";
+
+/** Health information for a remote node */
+export interface RemoteNodeHealth {
+  status: string;
+  version: string;
+  nodeId: string;
+}
+
+/** Fetch health information from a remote node */
+export async function fetchRemoteNodeHealth(nodeId: string): Promise<RemoteNodeHealth> {
+  return proxyApi<RemoteNodeHealth>("/health", { nodeId });
+}
+
+/** Fetch all projects from a remote node */
+export async function fetchRemoteNodeProjects(nodeId: string): Promise<ProjectInfo[]> {
+  return proxyApi<ProjectInfo[]>("/projects", { nodeId });
+}
+
+/** Fetch tasks from a specific project on a remote node */
+export async function fetchRemoteNodeTasks(nodeId: string, projectId: string): Promise<Task[]> {
+  return proxyApi<Task[]>(`/tasks?projectId=${encodeURIComponent(projectId)}`, { nodeId });
+}
+
+/** Fetch project health from a remote node */
+export async function fetchRemoteNodeProjectHealth(
+  nodeId: string,
+  projectId: string,
+): Promise<ProjectHealth> {
+  return proxyApi<ProjectHealth>(`/project-health?projectId=${encodeURIComponent(projectId)}`, {
+    nodeId,
+  });
+}