build: bump Gradle + Kotlin daemon heap for KMP

OOMs were happening at the previous limits (Gradle 4G / Kotlin 3G)
during ComposeApp.framework generation. Bumped to 6G / 4G with a
1G Metaspace cap and G1GC for steadier latency on incremental builds.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

gradle.properties

@@ -1,9 +1,17 @@
 #Kotlin
 kotlin.code.style=official
-kotlin.daemon.jvmargs=-Xmx3072M
+# Heap sizing for KMP builds.
+# Kotlin daemon runs the K2 compiler + native linker; 4 GB headroom
+# prevents long-tail OOMs during iosArm64 framework link.
+# MaxMetaspaceSize caps slow class-loading leaks across daemon reuse;
+# G1GC keeps pauses short during incremental builds.
+kotlin.daemon.jvmargs=-Xmx4096M -XX:MaxMetaspaceSize=1g -XX:+UseG1GC
 
 #Gradle
-org.gradle.jvmargs=-Xmx4096M -Dfile.encoding=UTF-8
+# Gradle daemon drives configuration cache + dependency resolution +
+# Compose/Android compilers. OOMs at 4 GB during ComposeApp.framework
+# generation; 6 GB is the usual safe size for projects this size.
+org.gradle.jvmargs=-Xmx6144M -XX:MaxMetaspaceSize=1g -XX:+UseG1GC -Dfile.encoding=UTF-8
 org.gradle.configuration-cache=true
 org.gradle.caching=true