fix: set compileSdkVersion to 36 for demo project

[velocitysystems]

Fix CI Android build by bumping compileSdkVersion to 36

Summary

• Bump compileSdkVersion from 35 to 36 in demo/android/build.gradle to fix the Android CI build

Problem

The Android build (/demo) fails with:

Dependency 'androidx.core:core:1.17.0' requires libraries and applications that
depend on it to compile against version 36 or later of the Android APIs.

:app is currently compiled against android-35.

androidx.core:core:1.17.0 and androidx.core:core-ktx:1.17.0 (pulled in transitively) now require compileSdk 36.

Fix

Updated compileSdkVersion from 35 to 36 in demo/android/build.gradle. targetSdkVersion remains at 35 as it controls runtime behavior and does not need to change.

Test plan

• iOS build succeeds (Debug, iphonesimulator)
• Android build succeeds (./gradlew assembleDebug)