M6: desktop app (tray, two-pane layout, shortcuts, inspector, jpackage)

app/desktopApp/build.gradle.kts

@@ -18,10 +18,64 @@ val desktopTarget = when {
 dependencies {
     implementation(project(":shared"))
     implementation("org.jetbrains.compose.desktop:desktop-jvm-$desktopTarget:$composeVersion")
+    // M6: window-state persistence (window.json).
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")
 }
 
 compose.desktop {
     application {
         mainClass = "iris.desktop.MainKt"
     }
+}
+
+// ── M6: native packaging (docs/11 §11.4) ─────────────────────────────────
+// `./gradlew :desktopApp:jpackage` builds a self-contained app image under
+// build/jpackage (JRE bundled). `./gradlew :desktopApp:jpackage
+// -PjpackageType=deb` builds a .deb instead (needs dpkg-deb).
+
+val jpackageInputDir = layout.buildDirectory.dir("jpackage-input")
+
+val fatJar = tasks.register<Jar>("fatJar") {
+    archiveClassifier.set("all")
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+    manifest { attributes("Main-Class" to "iris.desktop.MainKt") }
+    from(sourceSets.main.get().output)
+    from({
+        configurations.runtimeClasspath.get()
+            .filter { it.name.endsWith(".jar") }
+            .map { zipTree(it) }
+    }) {
+        exclude("META-INF/*.SF", "META-INF/*.DSA", "META-INF/*.RSA")
+    }
+}
+
+// Stage the fat jar into the jpackage input dir. A dedicated Sync task keeps
+// the Exec task free of task references (configuration-cache compatible) and
+// prunes stale jars from the input dir automatically.
+tasks.register<Sync>("stageJpackageInput") {
+    dependsOn(fatJar)
+    from(fatJar)
+    into(jpackageInputDir)
+}
+
+tasks.register<Exec>("jpackage") {
+    dependsOn("stageJpackageInput")
+    val jpackageBin = file("${System.getProperty("java.home")}/bin/jpackage")
+    val type = (project.findProperty("jpackageType") as? String) ?: "app-image"
+    val inputDir = jpackageInputDir.get().asFile
+    val destDir = layout.buildDirectory.dir("jpackage").get().asFile
+    inputs.dir(inputDir)
+    outputs.dir(destDir)
+    commandLine(
+        if (jpackageBin.exists()) jpackageBin.absolutePath else "jpackage",
+        "--name", "iris",
+        "--app-version", "0.1.0",
+        "--vendor", "Iris",
+        "--type", type,
+        "--input", inputDir.absolutePath,
+        "--main-jar", "desktopApp-all.jar",
+        "--main-class", "iris.desktop.MainKt",
+        "--dest", destDir.absolutePath,
+        "--java-options", "-Xmx1g",
+    )
 }