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/hooks/useNodeProxy.ts

@@ -0,0 +1,47 @@
+/**
+ * useNodeProxy hook - provides a proxy-aware fetch function that routes API calls
+ * through the node proxy when viewing a remote node.
+ */
+
+import { useCallback } from "react";
+import { proxyApi } from "../api";
+import { useNodeContext } from "../context/NodeContext";
+
+export interface UseNodeProxyResult {
+  /**
+   * Make an API request, optionally routing through the node proxy for remote nodes.
+   * When a remote node is active, requests are routed through /api/proxy/:nodeId/...
+   */
+  proxyFetch: <T>(path: string, opts?: RequestInit) => Promise<T>;
+  /** The current node ID or null if viewing local node */
+  currentNodeId: string | null;
+  /** Whether the current view is a remote node */
+  isRemote: boolean;
+}
+
+/**
+ * Hook that provides proxy-aware API fetching.
+ * Returns a proxyFetch function that automatically routes requests through the
+ * node proxy when viewing a remote node.
+ */
+export function useNodeProxy(): UseNodeProxyResult {
+  const { currentNodeId, isRemote } = useNodeContext();
+
+  const proxyFetch = useCallback(
+    <T>(path: string, opts?: RequestInit): Promise<T> => {
+      // Only route through proxy when viewing a remote node
+      // When local or no node set, proxyApi will call the direct API
+      return proxyApi<T>(path, {
+        ...opts,
+        nodeId: isRemote ? currentNodeId ?? undefined : undefined,
+      });
+    },
+    [currentNodeId, isRemote],
+  );
+
+  return {
+    proxyFetch,
+    currentNodeId,
+    isRemote,
+  };
+}