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

public/sw.js

@@ -0,0 +1,24 @@
+// Hermes OS service worker — cache shell for offline PWA
+const CACHE = "hermes-os-v1";
+const SHELL = ["/", "/manifest.json"];
+
+self.addEventListener("install", (e) => {
+  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(SHELL)));
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (e) => {
+  e.waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener("fetch", (e) => {
+  if (e.request.method !== "GET") return;
+  e.respondWith(
+    fetch(e.request).catch(() => caches.match(e.request))
+  );
+});