feat(android): open non-iframeable apps in in-app webview + webview perf

The kiosk's "Open in new tab" used window.open(..., 'noopener,noreferrer'),
which the WebView suppresses, so launching apps that can't be iframed did
nothing. Route such node apps (same host) into a local in-app WebView overlay
instead, keeping the kiosk view alive underneath; genuinely external links
still go to the system browser. Wired through onCreateWindow,
shouldOverrideUrlLoading, and a new ArchipelagoNative.openInApp() bridge.

Perf (no visual change): enable setOffscreenPreRaster to stop scroll
checkerboarding, and enable WebView remote debugging on debuggable builds
for chrome://inspect profiling.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Android/app/src/main/res/values/strings.xml

@@ -21,4 +21,6 @@
     <string name="retry">Retry</string>
     <string name="remote_input">Remote Control</string>
     <string name="remote_input_hint">Use your phone as a keyboard and mouse for the kiosk</string>
+    <string name="close">Close</string>
+    <string name="open_in_browser">Open in browser</string>
 </resources>