Simplify Lokksmith integration

shared/build.gradle.kts

@@ -10,6 +10,11 @@ plugins {
 kotlin {
     explicitApi()
 
+    androidTarget()
+    iosArm64()
+    iosSimulatorArm64()
+    jvm()
+
     // No iOS framework here — composeApp's umbrella `ComposeApp.framework`
     // transitively exports shared. Producing a second framework would double-bundle
     // the Kotlin stdlib at link time (PITFALL: duplicate-framework collision).