Migrate frontend to Vite + Hono CopilotKit runtime

Replaces the Next.js scaffold with a Vite SPA paired with a Hono
sidecar that hosts the CopilotKit runtime and proxies AG-UI traffic
to the MAF backend. Adds dev/prod Dockerfile, .dockerignore,
.gitignore, pnpm workspace config, and updates entrypoints
(main.tsx / App.tsx / index.css / index.html) plus the service
worker accordingly.

Server middleware reconciles MAF MESSAGES_SNAPSHOT id mismatches
so post-tool-call assistant text doesn't render twice, suppresses
duplicate text emitted alongside render tools, and strips OpenAI
training-token leaks from streamed deltas.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/public/sw.js

@@ -1,98 +1,4 @@
-const CACHE_NAME = 'wealthysmart-v1';
-const STATIC_ASSETS = ['/', '/index.html'];
-
-self.addEventListener('install', (event) => {
-  event.waitUntil(
-    caches.open(CACHE_NAME).then((cache) => cache.addAll(STATIC_ASSETS))
-  );
-  self.skipWaiting();
-});
-
-self.addEventListener('activate', (event) => {
-  event.waitUntil(
-    caches.keys().then((keys) =>
-      Promise.all(keys.filter((k) => k !== CACHE_NAME).map((k) => caches.delete(k)))
-    )
-  );
-  self.clients.claim();
-});
-
-self.addEventListener('fetch', (event) => {
-  const { request } = event;
-  const url = new URL(request.url);
-
-  // Network-first for API calls
-  if (url.pathname.startsWith('/api/')) {
-    event.respondWith(fetch(request).catch(() => caches.match(request)));
-    return;
-  }
-
-  // Only handle http(s) requests — skip chrome-extension:// etc.
-  if (!url.protocol.startsWith('http')) return;
-
-  // Cache-first for static assets
-  if (url.pathname.startsWith('/assets/')) {
-    event.respondWith(
-      caches.match(request).then((cached) => cached || fetch(request).then((res) => {
-        const clone = res.clone();
-        caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
-        return res;
-      }))
-    );
-    return;
-  }
-
-  // Network-first for navigation, fallback to cached index.html
-  if (request.mode === 'navigate') {
-    event.respondWith(
-      fetch(request).catch(() => caches.match('/index.html'))
-    );
-    return;
-  }
-
-  // Default: network with cache fallback
-  event.respondWith(fetch(request).catch(() => caches.match(request)));
-});
-
-// --- Push Notifications ---
-
-self.addEventListener('push', (event) => {
-  if (!event.data) return;
-
-  let data;
-  try {
-    data = event.data.json();
-  } catch {
-    // Fallback for plain-text pushes (e.g. browser test pushes)
-    data = { title: 'WealthySmart', body: event.data.text() };
-  }
-
-  const options = {
-    body: data.body,
-    icon: '/icons/icon-192.png',
-    badge: '/icons/icon-192.png',
-    data: { url: data.url || '/' },
-    vibrate: [200, 100, 200],
-    tag: 'transaction',
-    renotify: true,
-  };
-
-  event.waitUntil(self.registration.showNotification(data.title, options));
-});
-
-self.addEventListener('notificationclick', (event) => {
-  event.notification.close();
-
-  const url = event.notification.data?.url || '/';
-  event.waitUntil(
-    clients.matchAll({ type: 'window', includeUncontrolled: true }).then((windowClients) => {
-      for (const client of windowClients) {
-        if (client.url.includes(self.location.origin) && 'focus' in client) {
-          client.navigate(url);
-          return client.focus();
-        }
-      }
-      return clients.openWindow(url);
-    })
-  );
+self.addEventListener("install", () => self.skipWaiting());
+self.addEventListener("activate", async () => {
+  await self.registration.unregister();
 });