feat(discord): add opt-in mobile rich presence with track artwork

android/app/src/main/AndroidManifest.xml

@@ -38,6 +38,9 @@
         android:networkSecurityConfig="@xml/network_security_config"
         android:enableOnBackInvokedCallback="true"
         android:localeConfig="@xml/locale_config">
+        <!-- Presence uses RPC only; do not expose unused SDK voice/auth components. -->
+        <service android:name="com.discord.socialsdk.ForegroundService" tools:node="remove" />
+        <activity android:name="com.discord.socialsdk.AuthenticationActivity" tools:node="remove" />
         <activity
             android:name=".AudioOutputActivity"
             android:exported="false"