chore: update Android SDK to v4.1.1

[mhamann]

Overview

Updates the Rownd Android SDK dependency from v4.1.0 to v4.1.1 to include a critical bug fix that prevents fatal crashes in React Native applications.

Problem Fixed

The previous version had a DataStore singleton pattern violation that caused this fatal crash:

java.lang.IllegalStateException: There are multiple DataStores active 
for the same file: /data/data/.../files/datastore/rownd_state.json

Root Cause

• StateRepo.defaultDataStore() was creating new DataStore instances on every call
• Multiple DataStores accessing the same file violates Android DataStore requirements
• Triggered by component re-mounting, activity lifecycle changes, or hot reloads

Solution in Android SDK v4.1.1

• ✅ Fixed singleton pattern with proper instance caching
• ✅ Added thread safety with @Synchronized annotation
• ✅ Prevented memory leaks by using applicationContext
• ✅ Eliminated risky null assertions

Impact

• Before: Fatal crashes for customers using React Native
• After: Stable, crash-free experience

Changes

• android/build.gradle: Updated io.rownd:android from 4.1.0 → 4.1.1

Testing

• Verified dependency update
• No breaking API changes
• Backward compatible

This resolves customer-reported production crashes and should be deployed immediately.