chore: Release version 0.3.1 to Android

I've been using it on the beta track for a few weeks now and it's
clearly stabilized. Hooray!

Author: thehale

android/gradle.properties

@@ -1,4 +1,4 @@
-#Tue, 23 Sep 2025 23:04:28 -0700
+#Thu, 02 Oct 2025 21:24:06 -0700
 # Project-wide Gradle settings.
 
 # IDE (e.g. Android Studio) users:
@@ -44,5 +44,5 @@ hermesEnabled=true
 # Note: Only works with ReactActivity and should not be used with custom Activity.
 edgeToEdgeEnabled=false
 
-VERSION_CODE=28
+VERSION_CODE=29
 VERSION_NAME=0.3.1