fix(neode-ui): companion app opens every app in the native WebView, never an iframe

Regression: only X-Frame-Options apps were routed to the companion's
in-app WebView; iframeable apps fell through to the iframe session, which
is slower on the phone and loses the native back/forward/reload controls.
Now any launch inside the companion (ArchipelagoNative.openInApp bridge
present) goes to the WebView — both openSession and the legacy open()
overlay fallback. Mobile web/PWA keeps the iframe session. With regression
tests.

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

neode-ui/src/utils/openExternal.ts

@@ -18,6 +18,16 @@ function nativeBridge(): ArchipelagoNativeBridge | undefined {
   return (window as unknown as { ArchipelagoNative?: ArchipelagoNativeBridge }).ArchipelagoNative
 }
 
+/**
+ * True when running inside the Android companion app (native WebView shell).
+ * The shell injects `window.ArchipelagoNative`; a plain mobile browser / PWA
+ * never has it.
+ */
+export function isCompanionApp(): boolean {
+  const native = nativeBridge()
+  return !!native && typeof native.openInApp === 'function'
+}
+
 export function openExternalUrl(url: string): void {
   if (!url) return
   const native = nativeBridge()