App: Set macOS application icon

This commit updates the `composeApp/build.gradle.kts` to specify an icon for the macOS application build.
- The `packageName` for native distributions has been changed from "id.neotica.modernadb" to "ModernADB".
- A new `macOS` configuration block is added to set the `iconFile` to `ModernADB.icns`, which is expected to be generated by moko-resources.
- The `ModernADB.icns` icon file has been added to `composeApp/src/desktopMain/moko-resources/files/`.

Author: laetuz

composeApp/build.gradle.kts

@@ -10,10 +10,10 @@ plugins {
 
 kotlin {
     jvm("desktop")
-    
+
     sourceSets {
         val desktopMain by getting
-        
+
         commonMain.dependencies {
             implementation(compose.runtime)
             implementation(compose.foundation)
@@ -46,9 +46,14 @@ compose.desktop {
 
         nativeDistributions {
             targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb, TargetFormat.Rpm)
-            packageName = "id.neotica.modernadb"
+            packageName = "ModernADB"
             packageVersion = "1.0.0"
 
+            macOS {
+                val generatedIcon = layout.buildDirectory.file("generated/moko-resources/desktopMain/res/files/ModernADB.icns")
+                iconFile.set(generatedIcon)
+            }
+
             project.file("src/desktopMain/composeResources/platform-tools").resolve(
                 when {
                     System.getProperty("os.name").startsWith("Windows") -> "windows"