feat: bump Nucleus to 2.0.3 and opt the demo into dockIconFollowsWindows

Nucleus 2.0.3 adds nucleusApplication(dockIconFollowsWindows), which keeps a
tray-only app out of the macOS Dock and shows the icon only while a real
DecoratedWindow is visible. TrayAppDemo opts in to exercise it.

Author: kdroidFilter

demo/src/jvmMain/kotlin/dev/nucleusframework/composenativetray/demo/TrayAppDemo.kt

@@ -33,7 +33,7 @@ import org.jetbrains.compose.resources.painterResource
 @OptIn(ExperimentalTrayAppApi::class)
 fun main() {
     allowComposeNativeTrayLogging = true
-    nucleusApplication {
+    nucleusApplication(dockIconFollowsWindows = true) {
         var isWindowVisible by remember { mutableStateOf(true) }
         val coroutineScope = rememberCoroutineScope()
 

gradle/libs.versions.toml

@@ -5,8 +5,8 @@ kotlinx-coroutines = "1.11.0"
 compose = "1.11.1"
 detekt = "1.23.8"
 ktlint = "12.1.2"
-nucleus = "2.0.0-alpha-202607120617"
-nucleus-plugin = "2.0.0-alpha-202607120617"
+nucleus = "2.0.3"
+nucleus-plugin = "2.0.3"
 
 [libraries]
 kermit = { module = "co.touchlab:kermit", version.ref = "kermit" }