GTD quadrant launcher icon; build speedups: arm64-only, 8G gradle heap, cached SDK step

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/android/gradle.properties

@@ -10,7 +10,7 @@
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 # Default value: -Xmx512m -XX:MaxMetaspaceSize=256m
-org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m
+org.gradle.jvmargs=-Xmx8192m -XX:MaxMetaspaceSize=1024m
 
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
@@ -28,7 +28,9 @@ android.enablePngCrunchInReleaseBuilds=true
 # Use this property to specify which architecture you want to build.
 # You can also override it from the CLI using
 # ./gradlew <task> -PreactNativeArchitectures=x86_64
-reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
+# arm64 only: Pixel is arm64-v8a; x86/v7a builds are wasted time + APK bloat.
+# Add back x86_64 temporarily if an emulator build is ever needed.
+reactNativeArchitectures=arm64-v8a
 
 # Use this property to enable support to the new architecture.
 # This will allow you to use TurboModules and the Fabric render in