feat(pwa): Add update prompt for new versions

- Change registerType from 'autoUpdate' to 'prompt'
- Add UpdatePrompt component that shows when new version available
- Users see banner with "Update" or "Later" buttons
- Service worker checks for updates every hour

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cannaiq/src/App.tsx

@@ -54,10 +54,12 @@ import { SeoOrchestrator } from './pages/admin/seo/SeoOrchestrator';
 import { StatePage } from './pages/public/StatePage';
 import { SeoPage } from './pages/public/SeoPage';
 import { PrivateRoute } from './components/PrivateRoute';
+import { UpdatePrompt } from './components/UpdatePrompt';
 
 export default function App() {
   return (
     <BrowserRouter>
+      <UpdatePrompt />
       <Routes>
         <Route path="/" element={<Home />} />
         <Route path="/login" element={<Login />} />

cannaiq/src/components/UpdatePrompt.tsx

@@ -0,0 +1,45 @@
+/**
+ * PWA Update Prompt
+ *
+ * Shows a banner when a new version of the app is available.
+ * Uses the virtual:pwa-register/react hook from vite-plugin-pwa.
+ */
+
+import { useRegisterSW } from 'virtual:pwa-register/react';
+
+export function UpdatePrompt() {
+  const {
+    needRefresh: [needRefresh, setNeedRefresh],
+    updateServiceWorker,
+  } = useRegisterSW({
+    onRegistered(r) {
+      // Check for updates every hour
+      r && setInterval(() => r.update(), 60 * 60 * 1000);
+    },
+  });
+
+  if (!needRefresh) return null;
+
+  return (
+    <div className="fixed bottom-4 right-4 z-50 bg-emerald-600 text-white px-4 py-3 rounded-lg shadow-lg flex items-center gap-3 max-w-sm">
+      <div className="flex-1">
+        <p className="font-medium">New version available</p>
+        <p className="text-sm text-emerald-100">Refresh to update CannaIQ</p>
+      </div>
+      <div className="flex gap-2">
+        <button
+          onClick={() => setNeedRefresh(false)}
+          className="px-3 py-1 text-sm text-emerald-200 hover:text-white"
+        >
+          Later
+        </button>
+        <button
+          onClick={() => updateServiceWorker(true)}
+          className="px-3 py-1 text-sm bg-white text-emerald-600 rounded font-medium hover:bg-emerald-50"
+        >
+          Update
+        </button>
+      </div>
+    </div>
+  );
+}

cannaiq/src/vite-env.d.ts

@@ -1,4 +1,5 @@
 /// <reference types="vite/client" />
+/// <reference types="vite-plugin-pwa/react" />
 
 interface ImportMetaEnv {
   readonly VITE_API_URL?: string;

cannaiq/vite.config.ts

@@ -6,7 +6,7 @@ export default defineConfig({
   plugins: [
     react(),
     VitePWA({
-      registerType: 'autoUpdate',
+      registerType: 'prompt',
       includeAssets: ['favicon.svg'],
       manifest: {
         name: 'CannaIQ',