feat(desktop): use the Flipcash app icon on all three desktop platforms

apps/desktop/build.gradle.kts

@@ -74,6 +74,11 @@ compose.desktop {
             targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
             packageName = "Flipcash"
             packageVersion = "1.0.0"
+            // Rendered from the iOS app's Icon Composer file (code-ios-app Flipcash/Supporting Files/AppIcon.icon)
+            // with ictool, so all three desktop icons match the phone apps.
+            macOS { iconFile.set(project.file("icons/Flipcash.icns")) }
+            windows { iconFile.set(project.file("icons/Flipcash.ico")) }
+            linux { iconFile.set(project.file("icons/Flipcash.png")) }
         }
     }
 }

apps/desktop/src/main/kotlin/com/flipcash/desktop/Main.kt

@@ -1,12 +1,18 @@
 package com.flipcash.desktop
 
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.painter.BitmapPainter
+import androidx.compose.ui.graphics.toAwtImage
+import androidx.compose.ui.graphics.toComposeImageBitmap
 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 dev.zacsweers.metro.createGraph
 import kotlinx.coroutines.runBlocking
+import org.jetbrains.skia.Image
+import java.awt.Taskbar
 import java.lang.management.ManagementFactory
 
 fun main() {
@@ -15,10 +21,12 @@ fun main() {
         graph.startup()
         graph.restoreSession()
     }
+    val appIcon = loadAppIcon()
     application {
         Window(
             onCloseRequest = ::exitApplication,
             title = "Flipcash",
+            icon = appIcon,
             state = rememberWindowState(width = 420.dp, height = 860.dp),
         ) {
             DesktopApp(graph, signedIn)
@@ -30,3 +38,21 @@ fun main() {
         }
     }
 }
+
+/**
+ * Title bar and taskbar icon on Windows and Linux. A packaged Mac app takes its Dock icon from the bundle;
+ * `gradle run` does not, so the Dock would show the Java icon without the Taskbar call. The Mac image
+ * keeps the 824/1024 icon grid margin so it sits level with other Dock icons.
+ */
+private fun loadAppIcon(): BitmapPainter {
+    if (Taskbar.isTaskbarSupported() && Taskbar.getTaskbar().isSupported(Taskbar.Feature.ICON_IMAGE)) {
+        Taskbar.getTaskbar().iconImage = loadBitmap("/flipcash-icon-macos.png").toAwtImage()
+    }
+    return BitmapPainter(loadBitmap("/flipcash-icon.png"))
+}
+
+private fun loadBitmap(path: String): ImageBitmap {
+    val bytes = checkNotNull(object {}.javaClass.getResourceAsStream(path)) { "missing resource $path" }
+        .use { it.readBytes() }
+    return Image.makeFromEncoded(bytes).toComposeImageBitmap()
+}