Dashboard Studio 1.14.1: Android app, phone menu button, install fix

- Android app (android/, built with build.sh): signs in to Home Assistant once, opens Dashboard Studio full screen, renews the ingress session; downloadable from Install as an app
- Phone dashboards: a round menu button brings back the top bar with Edit, Kiosk and Install as an app
- Install as an app explains what works per device (Android app, https for browser install, iPhone limits)
- Fixed: browser install failed because the manifest was fetched without the Home Assistant sign-in

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dashboard_studio/server/main.py

@@ -234,6 +234,13 @@ async def service_worker(request):
     return web.Response(text=js, content_type="application/javascript", headers={"Cache-Control": "no-store"})
 
 
+async def android_app(request):
+    """The Android app (built from android/ in the repository), to download on a phone."""
+    return web.FileResponse(WEB_DIR / "dashboard-studio.apk", headers={
+        "Content-Type": "application/vnd.android.package-archive",
+        "Content-Disposition": 'attachment; filename="Dashboard Studio.apk"', "Cache-Control": "no-store"})
+
+
 async def get_dashboards(request):
     return web.json_response(load_store())
 
@@ -372,6 +379,7 @@ def make_app():
     app.router.add_get("/api/version", version)
     app.router.add_get("/manifest.webmanifest", manifest)
     app.router.add_get("/sw.js", service_worker)
+    app.router.add_get("/android.apk", android_app)
     app.router.add_get("/api/changelog", changelog)
     app.router.add_get("/api/whoami", whoami)
     app.router.add_get("/api/users", users)