improved android client, feature parity with desktop

android/app/src/test/resources/robolectric.properties

@@ -0,0 +1,11 @@
+# Robolectric ships no Android image for API 36 yet, and defaults to the app's
+# targetSdk, so host tests would fail to start. 34 is the newest it has and is
+# well above minSdk 31; anything whose behaviour actually turns on the API level
+# belongs in androidTest, on a real device, not here.
+sdk=34
+
+# ProtonStreamApplication.onCreate() calls System.loadLibrary("pstr_android"),
+# which has no host build. Host tests get a plain Application; everything that
+# needs the bridge is an instrumentation test by construction — see
+# androidTest/.../UniFfiBoundaryTest.
+application=android.app.Application