MVP: Pulse, Memory, History modules

- Mobile-first PWA with dark glassmorphic theme
- Pulse: status card, recent sessions, memory snapshot
- Memory: view/edit agent + user memory with usage bars
- History: session list, platform filter, search, session replay
- TanStack Query hooks for all Hermes WebAPI endpoints
- Bottom tab navigation, safe-area support

components/Providers.tsx

@@ -0,0 +1,16 @@
+"use client";
+
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { useState } from "react";
+
+export function Providers({ children }: { children: React.ReactNode }) {
+  const [client] = useState(
+    () =>
+      new QueryClient({
+        defaultOptions: {
+          queries: { staleTime: 30_000, retry: 1, refetchOnWindowFocus: true },
+        },
+      })
+  );
+  return <QueryClientProvider client={client}>{children}</QueryClientProvider>;
+}