fix(demo): companion app skips the demo intro — lands straight on /login

When the demo build runs inside the Android companion WebView
(window.ArchipelagoNative bridge, detected via the existing
isCompanionApp()), all four IS_DEMO intro branch sites now skip the
typing splash and /onboarding/intro and route directly to /login, as if
the intro was already seen:
- App.vue root-boot replay request (companion never requests the splash)
- App.vue post-splash demo routing
- RootRedirect proceedToApp() and the server-up onMounted demo branch

The skip paths write nothing to localStorage/sessionStorage (RootRedirect
skips even its boot log() there), so the browser/PWA demo intro — which
replays on every fresh root boot — is byte-identical to before, and
non-demo builds short-circuit on IS_DEMO before isCompanionApp() runs.
Adds a small isCompanionApp() bridge-detection unit test (700 tests green).

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

neode-ui/src/views/RootRedirect.vue

@@ -17,6 +17,7 @@ import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { isOnboardingComplete } from '@/composables/useOnboarding'
 import { IS_DEMO } from '@/composables/useDemoIntro'
+import { isCompanionApp } from '@/utils/openExternal'
 import BootScreen from '@/components/BootScreen.vue'
 
 const router = useRouter()
@@ -80,6 +81,13 @@ async function checkOnboarded(): Promise<boolean> {
 
 async function proceedToApp() {
   if (IS_DEMO) {
+    // Companion in-app demo skips the intro (acts as intro-already-seen) and
+    // lands on /login; browser demo unaffected. No log() here — it writes
+    // sessionStorage, and the skip path must write nothing.
+    if (isCompanionApp()) {
+      router.replace('/login').catch(() => {})
+      return
+    }
     demoRoute()
     return
   }
@@ -147,6 +155,12 @@ onMounted(async () => {
   if (isUp) {
     // Demo: per-day intro gate instead of server-side onboarding state.
     if (IS_DEMO) {
+      // Companion in-app demo skips the intro; browser demo unaffected.
+      // No log() — the skip path must write nothing to storage.
+      if (isCompanionApp()) {
+        router.replace('/login').catch(() => {})
+        return
+      }
       demoRoute()
       return
     }