feat: cible desktop macOS via :desktopApp:run

desktopApp/src/main/kotlin/com/livrets/desktop/Main.kt

@@ -0,0 +1,20 @@
+package com.livrets.desktop
+
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import androidx.compose.ui.window.rememberWindowState
+import com.livrets.App
+
+fun main() = application {
+    Window(
+        onCloseRequest = ::exitApplication,
+        title = "Livrets",
+        state = rememberWindowState(width = 480.dp, height = 800.dp),
+    ) {
+        App(filesDirPath = storageDir())
+    }
+}
+
+private fun storageDir(): String =
+    System.getProperty("user.home") + "/.livrets"