Notify of pokes and private messages on Android, with TeamSpeak's sounds

While the app is out of sight, a poke or a private message posts a
notification; a message's one gathers the conversation, takes a reply
inline and opens its chat. The notifications are silent, as the sound
pack already plays TeamSpeak's own sound for either.

The build bundles the sound packs of the TeamSpeak 3 client found next
to the checkout (or at ts3.client.dir / TS3_CLIENT_DIR), unpacked into
the profile once per app version. Sound Settings picks the pack and its
volume, and speech packs talk through the phone's text-to-speech.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -3,6 +3,47 @@ plugins {
     alias(libs.plugins.kotlin.compose)
 }
 
+/**
+ * Copies the sound packs of an installed TeamSpeak 3 client into the app's assets, as the
+ * desktop client borrows them from the installation. They are TeamSpeak's and not in the
+ * repository; a build without the client ships no packs.
+ */
+abstract class BundleSoundPacks : DefaultTask() {
+    @get:InputFiles
+    @get:PathSensitive(PathSensitivity.RELATIVE)
+    abstract val packs: DirectoryProperty
+
+    @get:OutputDirectory
+    abstract val assets: DirectoryProperty
+
+    @TaskAction
+    fun copy() {
+        val out = assets.get().asFile
+        out.deleteRecursively()
+        val source = packs.get().asFile
+        if (!source.isDirectory) {
+            logger.warn("No TeamSpeak 3 sound packs at $source; the app ships without sounds")
+            return
+        }
+        source.copyRecursively(File(out, "sound"))
+    }
+}
+
+val ts3ClientDir: String = providers.gradleProperty("ts3.client.dir")
+    .orElse(providers.environmentVariable("TS3_CLIENT_DIR"))
+    .getOrElse(rootDir.resolve("../TeamSpeak3-Client-linux_amd64").path)
+
+val bundleSoundPacks = tasks.register<BundleSoundPacks>("bundleSoundPacks") {
+    packs.set(File(ts3ClientDir, "sound"))
+    assets.set(layout.buildDirectory.dir("generated/soundPacks"))
+}
+
+androidComponents {
+    onVariants { variant ->
+        variant.sources.assets?.addGeneratedSourceDirectory(bundleSoundPacks, BundleSoundPacks::assets)
+    }
+}
+
 android {
     namespace = "com.ts3client.android"
     compileSdk = 37