chore(demo): enable Proguard for release builds

Author: fadi-george

examples/demo/android/app/build.gradle

@@ -56,8 +56,9 @@ react {
 
 /**
  * Set this to true to Run Proguard on Release builds to minify the Java bytecode.
+ * Enabled for the demo to keep the BrowserStack/e2e APK small (~28 MB → ~13 MB).
  */
-def enableProguardInReleaseBuilds = false
+def enableProguardInReleaseBuilds = true
 
 /**
  * The preferred build flavor of JavaScriptCore (JSC)