fix(android): release-build Timber tree at WARN+ for operator diagnosis

Debug builds got DebugTree; release builds had no tree planted at
all, so Timber.w / Timber.e calls were dropped silently in
production. That's how the UPnP select diagnostic-prints went
invisible during on-device testing - the released APK had no Timber
output reaching logcat.

Plant a release-only Tree that emits at WARN and above via
android.util.Log.println with the canonical 'Minstrel' tag (or the
caller-supplied tag when present). Keeps DEBUG / INFO traffic out of
production logcat (the chatty stuff is the part we don't want
flooding the buffer) while letting operator-driven adb logcat
sessions still see real failures.

android/app/src/main/java/com/fabledsword/minstrel/MinstrelApplication.kt

@@ -158,10 +158,43 @@ class MinstrelApplication :
 
     override fun onCreate() {
         super.onCreate()
-        if (BuildConfig.DEBUG) Timber.plant(Timber.DebugTree())
+        // Debug builds get the full DebugTree (verbose). Release builds
+        // get a WARN+ tree so operator-driven diagnosis via `adb logcat`
+        // still surfaces UPnP / cast failures, OkHttp errors, and our
+        // own Timber.w / Timber.e calls — without the chatty DEBUG /
+        // INFO traffic flooding the buffer in production.
+        if (BuildConfig.DEBUG) {
+            Timber.plant(Timber.DebugTree())
+        } else {
+            Timber.plant(ReleaseTree())
+        }
         appScope.launch { resumeController.restore() }
     }
 
+    /**
+     * Release-build Timber tree: emits at WARN and above only.
+     * `android.util.Log` with the canonical tag so `adb logcat` shows
+     * the line under the standard tag column without falling through
+     * to the package-stack-trace tag DebugTree produces.
+     */
+    private class ReleaseTree : Timber.Tree() {
+        override fun isLoggable(tag: String?, priority: Int): Boolean =
+            priority >= android.util.Log.WARN
+
+        override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
+            val resolvedTag = tag ?: "Minstrel"
+            if (t == null) {
+                android.util.Log.println(priority, resolvedTag, message)
+            } else {
+                android.util.Log.println(
+                    priority,
+                    resolvedTag,
+                    message + '\n' + android.util.Log.getStackTraceString(t),
+                )
+            }
+        }
+    }
+
     override val workManagerConfiguration: Configuration
         get() = Configuration.Builder()
             .setWorkerFactory(workerFactory)