build(desktop): enable ProGuard for release builds (#4772)

desktop/build.gradle.kts

@@ -43,6 +43,8 @@ compose.desktop {
     application {
         mainClass = "org.meshtastic.desktop.MainKt"
 
+        buildTypes.release.proguard { configurationFiles.from(project.file("proguard-rules.pro")) }
+
         nativeDistributions {
             targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
             packageName = "Meshtastic"

desktop/proguard-rules.pro

@@ -0,0 +1,4 @@
+-dontwarn android.os.Parcel**
+-dontwarn android.os.Parcelable**
+-dontwarn com.squareup.wire.AndroidMessage**
+-dontwarn io.ktor.**