build(android): configure R8 optimized resource shrinking and Play Core keep rules

Author: r4khul

android/app/proguard-rules.pro

@@ -14,7 +14,11 @@
 # prevents accidental stripping or aggressive obfuscation if future reflection is added.
 -keep class com.escapebranch.unfilter.** { *; }
 
+# Google Play Core (In-App Updates & Reviews)
+-keep class com.google.android.play.core.** { *; }
+
 # Default Android checks and harmless warnings
 -dontwarn android.support.**
 -dontwarn androidx.**
 -dontwarn io.flutter.**
+-dontwarn com.google.android.play.**

android/gradle.properties

@@ -3,3 +3,5 @@ android.useAndroidX=true
 android.newDsl=false
 # This builtInKotlin flag was added automatically by Flutter migrator
 android.builtInKotlin=false
+# Enables R8 integrated code and resource optimization pipeline (AGP 8.12+)
+android.r8.optimizedResourceShrinking=true