fix(kiosk): no reload on first service-worker claim + patient boot health check

Two causes of the fresh-install 'loads, refreshes, loads again' jank:

- The PWA autoUpdate service worker claims the page right after the very
  first load, firing controllerchange, which unconditionally reloaded the
  page. Now only a *replaced* controller (a real update) triggers reload.
- A single 2s RPC echo decided server-down on first boot, flashing the
  BootScreen and then hard-reloading seconds later. A second, 6s attempt
  now runs before concluding the backend is down.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/components/PWAUpdatePrompt.vue

@@ -32,8 +32,18 @@ let updateCallback: (() => Promise<void>) | null = null
 onMounted(() => {
   // Listen for service worker updates
   if ('serviceWorker' in navigator) {
+    // On the very first visit the page loads with no controlling SW; the
+    // freshly-installed worker then activates and claims the page
+    // (autoUpdate → clientsClaim), firing controllerchange. Reloading on
+    // that first claim caused the fresh-install "loads, then reloads"
+    // jank (worst on kiosk). Only reload when an existing controller is
+    // REPLACED — i.e. a genuine update.
+    let hadController = !!navigator.serviceWorker.controller
     navigator.serviceWorker.addEventListener('controllerchange', () => {
-      // Service worker updated, reload the page
+      if (!hadController) {
+        hadController = true
+        return
+      }
       window.location.reload()
     })
 

neode-ui/src/views/RootRedirect.vue

@@ -40,10 +40,10 @@ function log(msg: string, data?: unknown) {
   sessionStorage.setItem('archipelago_boot_log', prev + entry + '\n')
 }
 
-async function quickHealthCheck(): Promise<boolean> {
+async function quickHealthCheck(timeoutMs = 2000): Promise<boolean> {
   try {
     const ac = new AbortController()
-    const t = setTimeout(() => ac.abort(), 2000)
+    const t = setTimeout(() => ac.abort(), timeoutMs)
     const res = await fetch('/rpc/v1', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
@@ -132,7 +132,16 @@ onMounted(async () => {
     return
   }
 
-  const isUp = await quickHealthCheck()
+  // First-boot backends can be up but slow (image loads, first-run podman
+  // work), so a single 2s echo timing out used to flash the BootScreen and
+  // then hard-reload seconds later ("loads, refreshes, loads again" on
+  // kiosk). Give it a second, more patient attempt before concluding the
+  // server is down.
+  let isUp = await quickHealthCheck()
+  if (!isUp) {
+    log('healthCheck retry with longer timeout')
+    isUp = await quickHealthCheck(6000)
+  }
   log('production flow', { isUp })
 
   if (isUp) {